Change search
Refine search result
1234567 51 - 100 of 312
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 51.
    Edwards, Ylva
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Kinnmark, Mikael
    Betongens del att undvika blåsor i beläggningen2010In: Betong, ISSN 1101-9190, no 3, p. 38-39Article in journal (Other academic)
  • 52.
    Edwards, Ylva
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Kinnmark, Mikael
    Betongens del i att undvika blåsor i beläggningen2010In: Betong, ISSN 1101-9190, no 3Article in journal (Other academic)
  • 53.
    Edwards, Ylva
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Pettersson Skog, Anna
    Systemlösningar för gröna anläggningar/tak2014In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, Vol. 106, no 4, p. 31-33Article in journal (Other academic)
  • 54.
    Edwards, Ylva
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Sender, U
    ByggaBAD 20202012In: Badmästaren, no 8, p. 34-35Article in journal (Other academic)
  • 55.
    Edwards, Ylva
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Tasdemir, Yuksel
    Energy saving and environmental friendly wax concept for polymer modified mastic asphalt2010In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 43, no 1(S), p. 123-131Article in journal (Refereed)
  • 56.
    Ewertson, Cathrine
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Fältprovningsplatser2010In: CBI-nytt, ISSN 0349-2060, no 1, p. 4-5Article in journal (Other academic)
  • 57.
    Fagerlund, Göran
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Equations for calculating the mean free distance between aggregate particles or air-pores in concrete1977Report (Other academic)
  • 58. Falchi, L
    et al.
    Mueller, Urs
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Influence and effectiveness of water-repellent admixtures on pozzolana-lime mortars for restoration application2013In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 49, p. 272-280Article in journal (Refereed)
    Abstract [en]

    Pozzolana-lime mortars modified with water-repellent admixtures were designed and studied to obtain mortars for restoration application. Powdered silane and calcium stearates were mixed with pozzolana, lime and sand and the chemical-physical properties of the resulting mortars were evaluated by X-ray diffraction, electron microscopy (SEM-EDX), thermogravimetric analysis and FT-IR spectroscopy. The mechanical behavior, the pore structure and the hygric behavior were measured. The resistance of water-repellent mortars to the salt crystallization was evaluated. Both calcium stearates and powdered silane allowed good water-repellent protection even if the water-repellent agents and their dosage modified some physical properties and the hydration kinetic.

  • 59.
    Fall, David
    et al.
    Chalmers University of Technology, Sweden.
    Shu, Jiangpeng
    Chalmers University of Technology, Sweden.
    Rempling, Rasmus
    Chalmers University of Technology, Sweden.
    Lundgren, Karin
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB. Chalmers University of Technology, Sweden.
    Two-way slabs: Experimental investigation of load redistributions in steel fibre reinforced concrete2014In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 80, p. 61-74Article in journal (Refereed)
    Abstract [en]

    In the design of two-way reinforced concrete slabs, e.g. using the strip or yield line design method, the possibility of redistributing the load between different loading directions is used. The main aim of the present study was to investigate how fibres affect the structural behaviour such as the possibility for redistribution, crack patterns and load-carrying capacity. The investigation was conducted by means of experiments on two-way octagonal slabs, simply supported on four edges, centrically loaded with a point load. The slabs spanned 2.2m in both directions and the reinforcement amount was twice as large in one direction as in the other, in order to provoke uneven load distribution. Three slabs of each reinforcement configuration were produced and tested: conventionally reinforced slabs, steel fibre reinforced slabs and a combination of both reinforcement types. The reaction force on each supported edge was measured on five rollers per edge. A moderate fibre content (35kg/m3) of double hook-end steel fibres was used. The steel fibres affected the structural behaviour significantly by providing post-cracking ductility and by increasing the ultimate load-carrying capacity by approximately 20%. Most significant, the steel fibres influenced the load redistribution in such a way that more load could be transferred to supports in the weaker direction after cracking. Further, more evenly distributed support reactions were obtained in the slabs containing both reinforcement types compared to the case when only conventional reinforcement was used. The slabs reinforced by steel fibres alone did not experience any bending hardening; however, a considerable post-cracking ductility was observed. Furthermore, the work presented in this paper will provide results suitable for use in benchmarking numerical and analytical modelling methods for steel fibre reinforced concrete, as the experimental programme also included extensive testing of material properties.

  • 60. Farhang, Ali
    Livslängdsdimensionering av betongkonstruktioner.2007In: CBI nytt, ISSN 0349-2060, no 1, p. 4-5Article in journal (Other academic)
  • 61. Farhang, Ali
    Sprickminimering i industrigolv2009In: CBI nytt, ISSN 0349-2060, no 2, p. 4-5Article in journal (Other academic)
  • 62.
    Fjällberg, Leif
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Nanosilikans accelerande effekt i portlandcement2009In: CBI-nytt, ISSN 0349-2060, no 1, p. 4-5Article in journal (Other academic)
    Download full text (pdf)
    FULLTEXT01
  • 63.
    Fjällberg, Leif
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Självläkande betong2014In: CBI-nytt, ISSN 0349-2060, no 1, p. 2-3Article in journal (Other academic)
  • 64. Flansbjer, Mathias
    et al.
    Lindqvist, Jan Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Metoder för detaljerade studier av sprickbildning2010In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, Vol. 102, no 7, p. 42-46Article in journal (Other academic)
  • 65. Fridh, Katja
    et al.
    Andersson, Ronny
    A model to calculate the CO2-uptake in a country’s concrete structures during service life and after2014In: Nordic Concrete Research, ISSN 0800-6377, Vol. 50, no 2, p. 443-446Article in journal (Refereed)
    Abstract [en]

    During the project ‘The CO2-cycle in cement and concrete’ an analytical model to quantify the CO2-uptake in a country a specified year was developed. That was accomplished by deriving a new model for the carbonation process and as input to that, measurements of carbonation in concrete indoors and studies of carbonation in crushed concrete were made. Through knowledge of the cement production each year, the distribution of the cement into different products and estimations of what concrete quality each product has, the total uptake for Sweden was calculated. For the year 2011 was the CO2-uptake calculated to 300 000 tons.

  • 66.
    Frogner-Kockum, Paul Christian
    et al.
    Swedish Geotechnical Institute, Sweden.
    Lindqvist, Jan Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Tillståndsbedömningar.
    Long-term performance of MSWI Bottom ash in a test road construction2016In: International Journal of Sustainable Construction Engineering and Technology, ISSN 2180-3242, Vol. 7, no 1Article in journal (Refereed)
    Abstract [en]

    The study focuses on long-term performances of MSWI bottom ash used as a reinforcement layer in a 8 years old road-construction. Long term properties may change under the combined effects of loading, climate- and chemical conditions. Characterization of the chemical changes in aged MSWI bottom ash is thus of prime interest as secondary alteration is a key process for the ageing of these kind of materials. The MSWI bottom ash in this study comprises a 60 meter-long segment of a test road, which was sampled eight years after construction. The objective of the sampling was to obtain a very low degree of disturbance to the application’s in-situ properties. Access to the sub-base was achieved by removing the surface course and unbound base course, leaving the top surface of the unbound sub-base reachable.  Epoxy impregnated slabs were also used for a micro textural and chemical characterization by SEM/EDS of the bottom ash sub-base layer. No cracks that imply movements or rotation of particles in the road construction or other disturbances as due to the sampling process were found. This undisturbed material made it possible to study chemical processes and structural changes that have been ongoing in the test road since it was constructed. The SEM/EDS analysis showed that most particles had reacted to some extent and that reaction-products surrounding aluminum particles were undisturbed. Partly decomposed particles indicate that the reaction (that has been ongoing since the road was constructed) has been slow and incomplete because of the coexistence of metallic aluminum and aluminum hydroxide. It also shows that the material not has been subjected to any physical influence during these 8 years that otherwise would have moved the reaction products from the particles that originally have reacted. Clay mineralization that indicates long-term ageing of the ash material was also detected by XRPD. The pH of the material was lower than 8.5, indicating a mature degree of carbonization. It is also concluded from the study that chemical reactions consistent with this maturity have been taking place in the road construction as indicated by textural relationships.

    Download full text (pdf)
    fulltext
  • 67. Garcia, Oihana
    et al.
    Malaga, Katarina
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Definition of the procedure to determine the suitability and durability of an anti-graffiti product for application on cultural heritage porous materials2012In: Journal of Cultural Heritage, ISSN 1296-2074, E-ISSN 1778-3674, Vol. 13, no 1, p. 77–82-Article in journal (Refereed)
  • 68.
    Gram, Annika
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    SKB utvecklas inom teori och praktik2009In: Betong, ISSN 1101-9190, no 5, p. 43-45Article in journal (Other academic)
  • 69.
    Gram, Annika
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Applications for numerical simulation of self-compacting concrete2010In: Nordic Concrete Research, ISSN 0800-6377, Vol. 42, no 2, p. 143-154Article in journal (Other academic)
  • 70.
    Gram, Annika
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Lagerblad, Björn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Obtaining rheological parameters from flow test: analytical, computational and lab test approach2014In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 63, p. 29-34Article in journal (Refereed)
    Abstract [en]

    In the mix design process of cementitious suspensions, an adequate rheology of the cement paste is crucial. A novel rheological field test device for cementitious fluids is presented here and investigated theoretically, by computer simulation and by lab tests. A simple flow stoppage test with a timed spread passage point provides accurate rheological parameters according to the Bingham material model. Values for yield stress and plastic viscosity are obtained for a test specimen of no more than 19.75 · 10- 6 m3 of fluid. This volume is equivalent to 19.75 g of water at room temperature. Such a small volume allows reliable tests even for small amounts of fillers. Promising results show that both yield stress and plastic viscosity can be determined by this simple test. This novel rheological test method also enables the correlation of different rheological equipment used by different laboratories.

  • 71. Granstrom, J.
    et al.
    Gällstedt, Mikael
    RISE, Innventia.
    Villet, M.
    Moon, J.S.
    Chatterjee, T.
    High performance encapsulation structures utilizing Russian Doll architectures2010In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 518, no 18, p. 5282-5287Article in journal (Refereed)
    Abstract [en]

    A Russian Doll encapsulation architecture utilizing pairs of free-standing barrier films and epoxy seals separated by nitrogen spacers is presented, enabling the use of low-cost epoxy to attach two or more free-standing barrier films to a substrate with improved barrier performance. The performance of various Russian Doll encapsulations was evaluated with the calcium thin film optical transmission test, showing improved performance of the Russian doll configuration relative to a non-nested barrier/spacer architecture, and demonstrating that water vapor transmission rates (WVTR) of 0.00021 g/(m 2, day) or below can be achieved with low-cost materials in this architecture. This WVTR correlates to a predicted lifetime of more than 10 years for bulk heterojunction solar cell modules fabricated and tested by Konarka Technologies (Lowell, MA, USA)..

  • 72. Grelk, Bent
    et al.
    Schouenborg, Björn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Deterioration of thin marble cladding: a major international study2008In: Construction journal of India, Vol. 11, no 6, p. 36-41Article in journal (Other academic)
  • 73. Groot, Caspar
    et al.
    Lindqvist, Jan Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    RILEM TC 203-RHM: Repair mortars for historic masonry: Performance requirements for renders and plasters2012In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 45, no 9, p. 1277–1285-Article in journal (Refereed)
    Abstract [en]

    This article gives a summary of functional_x000D_ and performance requirements for renders and plasters_x000D_ for historic masonry (design, execution and maintenance)._x000D_ Specific attention has been paid to degradation_x000D_ effects, such as caused by salt crystallization and_x000D_ freeze–thaw cycling. Traditional as well as designed_x000D_ prefab mortars are considered for repair intervention.

  • 74.
    Grund Bäck, Lina
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET)..
    Ali, Sharafat
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET)..
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Jonson, Bo
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för byggd miljö och energiteknik (BET)..
    Physical properties and Raman Spectroscopy of mixed alkali/alkaline earth silicate glassesManuscript (preprint) (Other academic)
  • 75.
    Grund Bäck, Lina
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Ali, Sharafat
    Linnaeus University, Sweden.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Möncke, Doris
    Linnaeus University, Sweden.
    Kamitsos, Efstratios I.
    National Hellenic Research Foundation, Greece.
    Jonson, Bo
    Linnaeus University, Sweden.
    Mixed alkali/alkaline earth-silicate glasses: Physical properties and structure by vibrational spectroscopy2019In: International Journal of Applied Glass Science, ISSN 2041-1286, Vol. 10, no 3, p. 349-362Article in journal (Refereed)
    Abstract [en]

    In this article, we investigate the correlation of selected physical properties with structural changes in quaternary mixed modifier alkali/alkaline earth oxide silicate glass  systems,  focusing  either  on  the  mixed  alkali  effect  [(20−x)Na2O–xK2O– 10CaO–70SiO2 (x = 0, 5, 10, 15, 20)] or on the mixed alkaline earth effect [20Na2O– (10−y)CaO–yBaO–70SiO2 (y = 0, 5, 10)]. A maximum microhardness and packing density, as well as a minimum glass transition temperature were observed for mixed alkali glasses. The mixed alkaline earth glasses do not exhibit any clear extrema in any  of  the  properties  studied.  The  hardness  and  glass  transition  temperature  de-creases, while the density and molar volume increases with increasing BaO content. Raman spectroscopy showed an increase in the Q3 group compared to the Q2 and Q4 groups as the high field strength ions Na+ or Ca2+ are substituted by their low field strength analogs K+  or Ba2+. In the mixed alkali series, the high field strength ion Na+, seems to push the low field strength ion K+ into lower energy sites when present simultaneously, while such an effect is not apparent for the mixed alkaline earth glasses, where the far IR spectra of mixed glasses are equivalent to the weighted averages of the pure glasses.

    Download full text (pdf)
    fulltext
  • 76.
    Grund Bäck, Lina
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Lundstedt, Karin
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Sundberg, Peter
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Orman, Robin
    Johnson Matthey Technology Centre, UK.
    Stålhandske, Christina
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Booth, Jonathan
    Johnson Matthey Technology Centre, UK.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Improved mechanical properties and chemical durability by modifying the float glass composition and thermo-chemical strengthening for photovoltaic cover glass2017Conference paper (Refereed)
    Abstract [en]

    Solar energy is promising renewable energy where glass is an important material and have a significant impact on the efficiency of the photovoltaic (PV) module. The cover glass of PV-modules constitutes a large part of the total weight of the unit. In a recent Solar-ERA.NET project, LIMES (www.limes.nu), have we been aiming towards developing 1 mm thin glass for PV modules by improving the indentation mechanical properties and by investigating a novel thermo-chemical strengthening method.

    Starting from traditional soda-lime-silicate float composition different components was studied in a DoE fashion. The mechanical properties were studied using nano- and microindentation, the chemical durability by P98 analysis and weathering experiments. The findings resulted in a suggested composition for improving the properties of float glass by adding small amounts of zinc and titanium oxide as well as increasing the amount of aluminum and magnesium oxide. The components found to improve the chemical resistance were alumina, zirconia, zinc, lanthanum and titanium oxide. The surface hardness, crack- and scratch resistance were improved when magnesia was replaced with zinc oxide. When magnesia was replaced with titania, the hardness was increased.

    Some results from the thermo-chemical strengthening experiments will be presented. Heating and quenching in a reactive gas atmosphere using aluminum precursors have resulted in chemically modified surface in addition to the thermal strengthening.

  • 77.
    Hassanzadeh, Ghassem
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Tillståndsbedömning och reparation av dykdalb2010In: CBI-nytt, ISSN 0349-2060, no 2, p. 4-5Article in journal (Other academic)
    Download full text (pdf)
    FULLTEXT01
  • 78. Hedebratt, J
    et al.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Lessons learned: Swedish design and construction of industrial concrete floors2012In: Nordic Concrete Research, ISSN 0800-6377, Vol. 45, p. 75-92Article in journal (Other academic)
  • 79.
    Hedebratt, Jerry
    et al.
    KTH Royal Institute of Technology, Sweden; Tyréns AB, Sweden.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Full-scale test of a pile supported steel fibre concrete slab2014In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 47, no 4, p. 647-666Article in journal (Refereed)
    Abstract [en]

    The aim of the short-term studies is to investigate the structural behaviour of pile supported slabs made of steel fibre concrete (SFC) only and combined reinforced steel fibre concrete. The studies include tests on an elevated slab where a combination of reinforcement bars and steel fibres have been used in one half of the slab and SFC only in the other half. The tests were performed on a column-supported elevated slab that simulates a half scale model of an industrial pile-supported floor slab. The short-term tests showed considerable structural and crack arresting performance that also increased with a higher dosage of fibres. A small addition of conventional reinforcement bars further increased the ultimate load capacity PMax. PMax was in the range of 125-298 kN for the two types of slab. The results indicate that SFC can be used with verifiable results in structural applications for elevated slabs and pile-supported floor slabs despite that the material testing from the ordered SFC showed a larger scatter in properties and that the calculated load capacities were only 40-220 kN. Main causes of deviance are arch and membrane effects.

  • 80. Hedlund, Hans
    et al.
    Petersson, Örjan
    Fotokatalytisk betong: en betong som är självrengörande och samtidigt bryter ned luftföroreningar2010In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, Vol. 102, no 8, p. 69-70Article in journal (Other academic)
  • 81. Hellers, B G
    et al.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Svenska Betongföreningen 100 år2012In: Samhällsbyggaren, ISSN 2000-2408, no 2, p. 8-11Article in journal (Other academic)
  • 82.
    Helsing, Elisabeth
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Nyheter och nyttigheter om CE-märkning och standadisering inom betongområdet2014In: CBI-nytt, ISSN 0349-2060, no 1, p. 4-5Article in journal (Other academic)
  • 83.
    Helsing, Elisabeth
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, CBI Swedish Cement and Concrete Research Institute.
    Salt-frostprovning av betong med slagg och flygaska2017Report (Other academic)
    Abstract [en]

    The purpose of the project has been to develop the salt-freeze-thaw method (the slab method in CEN TS/12390-9 and method A in SS 137244) further so that the results reflect what is taking place in the long run during real conditions in Swedish climate in concrete with binders containing slag and fly ash and thereby can be used to in initial tests in order to predict the salt-frost resistance of such concretes. By doing this basic knowledge about the salt-frost resistance of concretes containing slag a fly ash has been assembled.Since several studies have shown that the salt-frost resistance of slag concrete in particular is affected by carbonation, the influence of carbonation was studied. Concrete with slag and fly ash has a slower strength development at the early stages and the influence of this fact has also been included in the investigation.In the project 14 different concretes with varying binder compositions and the water-to-binder ratio 0.45 have been subjected to the standardized salt-frost scaling method and 5 variations of the method, where the age at sawing, the length of the conditioning period in 65 % RH and the carbon dioxide conditions have been varied. The tests have been accompanied by determination of strength development, air pore structure, weight gain during wetting and the first 28 frost cycles, inner degradation and analysis of the surface by XRD and microscopy. With some binder combinations mortar specimens have been prepared and on these sorption isotherms have been determined and TG-analysis and low temperature calorimetry tests have been carried out. Specimens for field exposure at the site adjacent to the main road 40 has also been prepared and placed. Within the project time only measurements after one winter season has been performed.The conclusion regarding the applicability of the existing test method is that for compositions with maximum 20 % slag or fly ash the method works well without adjustments. For compositions with higher amounts of slag or fly ash the conditioning should be completed with about one week exposure to 1 % CO2, in order to take into account the increased scaling due to carbonation. As regards the use on concretes with considerably slower strength development than normal the age of the specimens at the start of the salt-frost cycling can be increased to up to 90 days in order to reflect the performance in the long run. It should then also be ascertained that the concrete in question in a real case is not exposed to salt-frost attack at a lower maturity than what this represents.When it comes to the requirements on binder compositions for exposure class XF4, it is shown that the requirements which exist in SS 137003:2015 are fully adequate. Maximum 20 % slag or fly ash can be used without influencing the salt-frost resistance more than marginally at a water-to-binder ratio =0,45. Using 35 % fly ash or 65 % slag results in very large scaling. Using 35 % slag gives is ambiguous results, but may perhaps be acceptable if the maximum water-to-binder ratio in that case is decreased to 0,40.

    Download full text (pdf)
    fulltext
  • 84.
    Helsing, Elisabeth
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, CBI Swedish Cement and Concrete Research Institute.
    Malaga, Katarina
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, CBI Swedish Cement and Concrete Research Institute.
    Silva, Nelson
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, CBI Swedish Cement and Concrete Research Institute.
    Eva, Rodum
    Norwegian Public Roads Administration, Norway.
    Torkkeli, Minna
    Finnish Transport Agency, Finland.
    Hejll, Arvid
    Swedish Transport Administration, Sweden.
    A Nordic method for testing hydrophobic impregnations with regard to prevention of chloride ingress2017Report (Other academic)
    Abstract [en]

    Chloride induced corrosion of the reinforcement is the major cause of degradation of reinforced concrete structures. In particular in the Nordic countries, the use of de-icing salts during winter, leads to severe degradation of edge beams in road bridges. Thus, in order to extend the service life and decrease maintenance costs, hydrophobic impregnations are commonly used to prevent or slow down chloride ingress into concrete. There is a harmonised European standard for hydrophobic impregnations, EN 1504-2 [1], but the property “diffusion of chloride ions” is “subject to national standards and regulations”. The transport and road administrations of Sweden, Norway and Finland use different national methods to evaluate the performance of this type of products meaning that the same CEmarked product needs to meet different requirements. Therefore, the transport and road administrations of Sweden, Norway and Finland initiated a project with the aim to establish a common Nordic method for classification of hydrophobic impregnations with regard to their capability to protect concrete from chloride ingress. The project was divided into three phases consisting on the analysis of existing test standards (national and international), a pre-study to evaluate the influence of different tests parameters and a round robin test involving three laboratories (one in each country). A thorough comparison of the existing methods and review of relevant literature made it possible to define which test parameters could be used in the formulation of the new method and which ones required further studies. It was found that the type of surface to be treated, the length of the preconditioning period, the length of the curing period and whether the surface to be impregnated should be soaked with Ca(OH)2-solution or not should be further investigated. The results of the pre-study showed that the application of the impregnation to form surfaces led to somewhat better chloride blocking effect. Despite this, it was decided to use sawn surfaces in the method, since it is much easier to obtain reproducible surface characteristics that way. The characteristics of a form surface depend on e.g. the form material, use of release agents, curing conditions. Saturation of the surface with calcium hydroxide solution before impregnation was found slightly beneficial on the chloride blocking effect compared to when such a treatment was omitted. However, since this did not contribute to the robustness of the test results, it increased the number of experimental steps and it is not representative of practice in real structures, it was decided not to incorporate such a treatment in the new method. The chloride protection slightly increases with the impregnation curing time. It was not clear which factor was most dominant; if the continuous polymerization of the hydrophobic impregnation or the continuous cement hydration. Since enough curing time is necessary for the treatment to be efficient, it was decided that the curing period before exposure to chlorides should be 28 days. With the primary objective of determining the reliability and reproducibility of the new method, a round robin exercise was carried out. Three laboratories were involved in this phase; CBI-Borås in Sweden, SINTEF in Norway and VTT in Finland. The results show that despite some differences in both materials and methods, such as the type of cement or preconditioning and curing environments, highly reproducible results were obtained. In addition, a detailed discussion on the influence of the details of the method on the chloride profiles and on the filter effect is presented. Within the round robin test, the relative humidity before and after impregnation and the dry condition of the powder samples were found to be the major parameters leading to the discrepancy of the results. In addition, handling of the wet concrete surfaces after exposure to chlorides and the time period (and temperature) between the end of the chloride exposure and powder sampling for chloride analysis were found to have surprisingly large effects on the form of the chloride profiles in the samples. Therefore, these parts of the procedures were made much more precise in the final method, in order to increase its reproducibility. The method can be briefly described as follows: Concrete specimens are prepared by sawing 100 mm cubes into two halves, three cubes per test series. The sawn surfaces are defined as exposure faces. Three halves are treated with the hydrophobic impregnation to be tested and the other three halves are kept as untreated references. The specimens are exposed submerged in 15% NaCl-solution for 56 days. After exposure, the chloride ingress is determined by profile grinding and the total amount of penetrated chlorides is calculated. The chloride blocking effect of the hydrophobic impregnations, expressed as the Filter Effect, FE, which is determined as 1 minus the ratio between the amount of penetrated chlorides in treated and in non-treated concrete specimens. The results obtained in both the pre-study and round robin exercise were compared to those obtained with the existing national methods in order to establish proper requirement levels with the new method. Despite the many differences between the methods, it was found that a filter effect of approximately 0.65 correlates well with the existing requirement in the Swedish method and in the Norwegian method. However, given limited data available and also considering data from field investigations, a level of 0.60 is proposed as appropriate for a really well performing hydrophobic impregnation. The method was accepted as a Nordtest method in December 2015 with the denomination NT Build 515.

  • 85.
    Helsing, Elisabeth
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, CBI Swedish Cement and Concrete Research Institute.
    Parg, Lisa
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, CBI Swedish Cement and Concrete Research Institute.
    Mueller, Urs
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, CBI Swedish Cement and Concrete Research Institute.
    Ellison, Tommy
    BESAB, Sweden.
    Hydrofoberande medel i sprutbetong: Inverkan på egenskaper och beteendet vid sprutning2017Report (Other academic)
    Abstract [en]

    The overall goal with this project is to acquire more profound knowledge and experiences as regards the use of hydrophobic agents added to fresh concrete (hydrophobic admixtures) intended for sprayed concrete with low-alkali binders, with the purpose to enhance the durability and serviceability of the sprayed concrete. The results from this project contribute to increased understanding of the practical possibilities with and limitations for hydrophobic admixtures in sprayed concrete. Thus the need for costly field tests, with trial and error can be decreased.A large part of the project has been devoted to study the influence of the hydrophobic admixtures on the properties at an early stage, since these are decisive for the practical application. In addition the influence on strength development and bond have been determined. The hydrophobicity that these admixtures give the concrete has also been investigated. These tests have primarily been carried out on paste, mortar or concrete cast in a traditional way, not on sprayed concrete. Spraying tests have been carried out with one of the hydrophobic admixtures and a reference without admixture in order to study the behaviour at spraying. On samples from the sprayed concrete the bond, hydrophobicity and chloride intrusion have been determined.Two hydrophobic admixtures, Sitren P 750 (E) and Silres BS 1001 (W) have been used, both based on organosilicates. Admixture E consist of a modified siloxan which is attached to silica fume and admixture W is a water based emulsion of silan/siloxan. Most of the tests were carried out on a pure Portland cement (Degerhamns Anläggningscement from Cementa) and on a Portland-fly ash cement (Slite Anläggning FA from Cementa). Both cements are sulphate resistant and have low alkali content. Tests with and without accelerator have been carried out.When used without accelerator admixture W influenced the setting time and the heat development much more than admixture E. Admixture W had a clear retarding effect. It was though possible to compensate for this effect by adding an accelerator. The 28 day strength decreased when both admixtures were used, most with admixture W. But also in this case this effect was to some extent compensated by adding an accelerator. The accelerator did not have a decisive influence when admixture E was used. When the bond was determined on cast concrete admixture W gave higher and less deviating results than admixture E. The hydrophobicity in mixtures with the two admixtures was comparable.The spray test was carried out with admixture W and an accelerator. With the admixture less water was needed to give the same workability. The behaviour at spraying was as good as, or somewhat better, with the hydrophobic admixture compared to the mix without. The hydrophobic admixture did not influence the bond of the sprayed concrete. The water absorption of the sprayed concrete with the hydrophobic admixture was approximately 30 % lower than without, and the resistance to chloride intrusion was approximately 40 % higher.

  • 86.
    Herlin, Alexander
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Ballastens inverkan på betongens termiska egenskaper2014In: Svensk Bergs & Brukstidning, ISSN 0039-6435, Vol. 93, no 2Article in journal (Other academic)
  • 87.
    Herlin, Alexander
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Mätning av energi- och effektbehov i minihus2013In: CBI-nytt, ISSN 0349-2060, no 1, p. 4-Article in journal (Other academic)
    Download full text (pdf)
    FULLTEXT01
  • 88.
    Holmberg, Jonas
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, IVF.
    Rodri­guez Prieto, Juan Manuel
    Luleå University of Technology, Sweden.
    Berglund, Johan
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, IVF.
    Sveboda, Ales
    Luleå University of Technology, Sweden.
    Jonsén, Pär
    Luleå University of Technology, Sweden.
    Experimental and PFEM-simulations of residual stresses from turning tests of a cylindrical Ti-6Al-4V shaft2018In: Procedia CIRP, ISSN 2212-8271, E-ISSN 2212-8271, Vol. 71, p. 144-149Article in journal (Refereed)
    Abstract [en]

    Alloy Ti-6Al-4V is a frequently used material in aero space applications due the high strength and low weight. This material is however often considered as a difficult to machine alloy due to several material properties such as the inherent characteristics of high hot hardness and strength which is causing an increased deformation of the cutting tool during machining. The thermal properties also cause a low thermal diffusion from locally high temperatures in the cutting zone that allows for reaction to the tool material resulting in increased tool wear. Predicting the behavior of machining of this alloy is therefore essential when selecting machining tools or machining strategies. If the surface integrity is predicted, the influence of different machining parameters could be studied using Particle Finite Element (PFEM)-simulations. In this investigation the influence from cutting speed and feed during turning on the residual stresses has been measured using x-ray diffraction and compared to PFEM-simulations. The results showed that cutting speed and feed have great impact on the residual stress state. The measured cutting force showed a strong correlation especially to the cutting feed. The microstructure, observed in SEM, showed highly deformed grains at the surface from the impact of the turning operation and the full width half maximum from the XDR measurements distinguish a clear impact from different cutting speed and feed which differed most for the higher feed rate. The experimental measurements of the residual stresses and the PFEM simulations did however not correlate. The surface stresses as well as the sign of the residuals stresses differed which might be due to the material model used and the assumption of using a Coulomb friction model that might not represent the cutting conditions in the investigated case. © 2018 Elsevier B.V. All rights reserved.

    Download full text (pdf)
    fulltext
  • 89.
    Holmberg, Jonas
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, IVF. University Wes, Sweden.
    Wretland, Anders
    GKN Aerospace Sweden AB, Sweden.
    Berglund, Johan
    RISE - Research Institutes of Sweden (2017-2019), Materials and Production, IVF.
    Grit Blasting for Removal of Recast Layer from EDM Process on Inconel 718 Shaft: An Evaluation of Surface Integrity2016In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 25, no 12, p. 5540-5550Article in journal (Refereed)
    Abstract [en]

    The heat generated during EDM melts the work material and thereby allows large amounts to be removed, but an unfavorable surface of a recast layer (RCL) will also be created. This layer has entirely different properties compared to the bulk. Hence, it is of great interest to efficiently remove this layer and to verify that it has been removed. The main objective of this work has been to study the efficiency of grit blasting for removal of RCL on an EDM aero space shaft. Additionally, x-ray fluorescence (XRF) has been evaluated as a nondestructive measurement to determine RCL presence. The results show that the grit-blasting processing parameters have strong influence on the ability to remove RCL and at the same time introduce beneficial compressive stresses even after short exposure time. Longer exposure will remove the RCL from the surface but also increase the risk that a larger amount of the blasting medium will get stuck into the surface. This investigation shows that a short exposure time in combination with a short grit-blasting nozzle distance is the most preferable process setting. It was further found that handheld XRF equipment can be used as a nondestructive measurement in order to evaluate the amount of RCL present on an EDM surface. This was realized by analyzing the residual elements from the EDM wire.

    Download full text (pdf)
    fulltext
  • 90. Holmgren, Jonas
    et al.
    Lagerblad, Björn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Krympning av sprutbetong2008In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, Vol. 100, no 7, p. 30-34Article in journal (Other academic)
  • 91.
    Hosseini, Seyed
    et al.
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF, Tillverkningsprocesser. Chalmers University of Technology, Sweden; AB SKF, Sweden.
    Thuvander, Mattias
    Chalmers University of Technology, Sweden.
    Klement, Uta
    Chalmers University of Technology, Sweden.
    Sundell, Gustav
    Chalmers University of Technology, Sweden.
    Ryttberg, Kristina
    AB SKF, Sweden.
    Atomic-scale investigation of carbon atom migration in surface induced white layers in high-carbon medium chromium (AISI 52100) bearing steel2017In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 130, p. 155-163Article in journal (Refereed)
    Abstract [en]

    The microstructure and chemical composition of white layers (WLs) formed during hard turning of AISI 52100 steel were studied using atom probe tomography (APT) and transmission electron microscopy (TEM). APT analyses revealed a major difference in the re-distribution of the carbon (C) atoms between WLs formed above and below the Ac1 temperature, i.e. T-WL and M-WL, respectively. In T-WL, the C-atoms segregate to grain boundaries (GBs) forming interconnected or isolated C-rich clusters, ∼5 nm, with a concentration of 9.8 ± 0.3 at.%C. Apart from the GB segregation, in M-WLs, large C-rich regions were found with 24.8 ± 0.4 at.%C. Owing to the chemical composition (stoichiometry) and element partitioning of such regions, they were assigned as θ-carbides (cementite). The APT results reveal that the original θ-carbides remain un-dissolved in the M-WLs, but might be plastically deformed due to the excessive strain that exists in hard machining process. The obtained results are in good agreement with the temperatures that are reached during formation of M-WLs. The isolated nano-sized C-clusters were assigned as off-stoichiometric carbides whereas the interconnected C-rich clusters were attributed to Cottrell atmospheres, evident by the linear shape of the C-enrichment as observed in the APT reconstructions. The C-contents in the nano-sized martensitic and ferritic grains were estimated to 0.50 ± 0.06 at.%C and ∼0.46 ± 0.02 at.%C, respectively. The C-content in the ferritic grains, beyond the C-solubility limit in ferrite (<0.1 at.%) is governed by the high dislocation density inside the grains, supported by the favorable binding energy between dislocations and C-atoms compared to C-atoms and Fe in carbides. No other evidence of redistribution of the substitutional alloying elements was observed. TEM analyses showed that T-WLs comprises of an equiaxed and nano-sized grains with well-defined cell boundaries, whereas the structure in the M-WLs comprised of elongated sub-grains formed via re-orientation of the original martensite followed by breakage/partitioning into elongated sub-grains.

  • 92. Hughes, JJ
    et al.
    Lindqvist, Jan Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    RILEM TC 203-RHM: Repair mortars for historic masonry: The role of mortar in masonry: an introduction to requirements for the design of repair mortars2012In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 45, no 9, p. 1287–1294-Article in journal (Refereed)
    Abstract [en]

    Mortar has been in use for many thousands of years and is integral to most masonry construction. Its use is widespread in every culture where masonry is constructed. It is present in the majority of the global built cultural heritage, and is therefore a major consideration in building conservation. The effective design of a mortar for repairing masonry depends on a clear understanding of its function. The main functional uses of mortar in masonry are classified as bedding, pointing, grout, render, plaster, flooring and mortars for surface repairs. The requirements that each type of mortar must meet in service depend on its environmental exposure and its role in the masonry element that it is found within (e.g. issues such as historic authenticity, aesthetics, resistance to moisture ingress, structural integrity, and service life). Technical requirements such as adhesion, strength, elasticity, water and vapour transmittance, drying behaviour, thermal dilatation, ability to deal with salt contamination and freeze-thaw cycling, and its aesthetic properties can be quantified. Mortar properties can be adjusted by varying ingredients and their proportions, to meet the differing technical requirements.

  • 93.
    Jansson, Mikael
    et al.
    RISE, Innventia.
    Danielsson, Sverker
    RISE, Innventia.
    Edlund, U
    Albertsson, A-C
    Turnwood: barrier materials for packaging from wood hydrolysate2014Conference paper (Refereed)
  • 94. Johansson, Anders
    et al.
    Janz, Mårten
    Long term performance of water repellent treatment: water absorption tests of field objects in Stockholm2008In: Restoration of buildings and monuments, ISSN 1864 - 7251, Vol. 14, no 1, p. 39-47Article in journal (Refereed)
  • 95. Johansson, Johnny
    et al.
    Johansson, Thomas
    Självkompakterande lättballastbetong för fasadelement och bjälklagspågjutning2008In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, Vol. 100, no 7, p. 74-78Article in journal (Other academic)
  • 96.
    Johansson, Kenth S.
    RISE - Research Institutes of Sweden (2017-2019), Bioscience and Materials, Chemistry and Materials.
    20 - Surface Modification of Plastics2017In: Applied Plastics Engineering Handbook (Second Edition): Processing, Materials, and Applications / [ed] Kutz, Myer, Elsevier, 2017, p. 443-487Chapter in book (Other academic)
    Abstract [en]

    Abstract This chapter gives an overview of different methods for improving surface properties of plastics. Plastics are inherently hydrophobic, low surface energy materials and thus do not adhere well to other materials. Adhesion improvement is the most common application but other surface characteristics, such as wettability, water- and chemical resistance, nonfouling, tribological behavior, oxygen, and moisture transmission are also addressed. It has been estimated that 70% of the total production of plastic materials must be surface treated prior to processing. The methods range from vacuum to atmospheric pressure, wet to dry, simple to sophisticated, and inexpensive to very costly to obtain the required functional characteristics of plastics. Most methods used today are dry and environmentally sound. The methods presented are roughly divided in surface activation (e.g., plasma, corona, flame, and UV laser) and surface coating (e.g., plasma polymerization, chemical vapor deposition, Parylene, physical vapor deposition) techniques.

  • 97. Johansson, Lars
    et al.
    Thorsén, Anders
    Garage och P-hus2010In: Betong, ISSN 1101-9190, no 1Article in journal (Other academic)
  • 98.
    Johansson-Selander, Anders
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Janz, Mårten
    Penetration profiles of water repellent agents in concrete as a function of time: determined with FTIR-spectrometer2010In: Nordic Concrete Research, ISSN 0800-6377, Vol. 41, no 1, p. 51-60Article in journal (Other academic)
  • 99.
    Josefsson, Gabriella
    et al.
    Uppsala University, Sweden.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Gamstedt, E. Kristofer
    Uppsala University, Sweden.
    Elastic models coupling the cellulose nanofibril to the macroscopic film level2015In: RSC Advances, E-ISSN 2046-2069, Vol. 5, no 71, p. 58091-58099Article in journal (Refereed)
    Abstract [en]

    The mechanical behaviour of cellulose nanofibrils is typically characterized by casting thin films and performing tensile tests on strips cut from these films. When comparing the stiffness of different films, the stiffness of the nanofibrils is only qualitatively and indirectly compared. This study provides some schemes based on various models of fibre networks, or laminated films, which can be used to assess the inherent stiffness of the nanofibrils from the stiffness of the films. Films of cellulose nanofibrils from different raw materials were manufactured and the elastic properties were measured. The expressions relating the nanofibril stiffness and the film stiffness were compared for the presented models. A model based on classical laminate theory showed the best balance between simplicity and adequacy of the underlying assumptions among the presented models. Using this model, the contributing nanofibril stiffness was found to range from 20 to 27 GPa. The nanofibril stiffness was also calculated from mechanical properties of nanofibril films found in the literature and compared with measurements from independent test methods of nanofibril stiffness. All stiffness values were found to be comparable and within the same order of magnitude.

  • 100.
    Kalinowski, Mariusz
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Hur reaktiv är ballast från mellansverige?2014In: CBI-nytt, ISSN 0349-2060, no 2, p. 9-Article in journal (Other academic)
1234567 51 - 100 of 312
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf