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  • 251.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    En lägesrapport från betonggolvet2012In: CBI-nytt, ISSN 0349-2060, no 1, p. 9-Article in journal (Other academic)
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  • 252.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    fib Symposium "Concrete structures for sustainable community"2012In: CBI-nytt, ISSN 0349-2060, no 2, p. 8-Article in journal (Other academic)
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  • 253.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Funktionskrav för pågjutningar som reparationsåtgärd2012In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, no 7, p. 25-27Article in journal (Other academic)
  • 254.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Oberoende betongpositiv2013In: CBI-nytt, ISSN 0349-2060, no 1, p. 12-Article in journal (Other academic)
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  • 255.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Om forskningens kvalitet nytta och påverkan2012In: CBI-nytt, ISSN 0349-2060, no 2, p. 12-Article in journal (Other academic)
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  • 256.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Rapport från Karlsruhe2012In: Betong, ISSN 1101-9190, no 4, p. 48-50Article in journal (Other academic)
  • 257.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Renässans för industrigolvet2009In: Cementa, ISSN 0346-8771, no 1, p. 10-11Article in journal (Other academic)
  • 258.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Satsa på funktionsentreprenad för brounderhåll2008In: Byggindustrin, ISSN 1104-5981, no 7, p. 14-Article in journal (Other academic)
  • 259.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Stående ovationer på teknologisk konferens: rapport från ACI:s konvent2008In: Betong, ISSN 1101-9190, no 2Article in journal (Other academic)
  • 260.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Vikten av vår historia2012In: CBI-nytt, ISSN 0349-2060, no 1, p. 12-Article in journal (Other academic)
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  • 261.
    Silfwerbrand, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Farhang, Ali
    Rätt golvbetong minskar risken för sprickor2013In: Betong, ISSN 1101-9190, no 1, p. 46-49Article in journal (Other academic)
  • 262.
    Silfwerbrand, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    McNamee, Robert
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Stor steg för brandsäkerheten2011In: Betong, ISSN 1101-9190, no 1, p. 37-39Article in journal (Other academic)
  • 263.
    Silfwerbrand, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Selander, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Storsatsa på nyttiga innovationer2008In: Betong, ISSN 1101-9190, no 6, p. 43-45Article in journal (Other academic)
  • 264.
    Silfwerbrand, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Selander, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Storsatsa på nyttiga innovationer2008In: Betong, ISSN 1101-9190, no 6, p. 43-45Article in journal (Other academic)
  • 265.
    Silva, Nelson
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Boubitsas, Dimitrios
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Critical conditions for depassivation of steel in concrete: interface chloride profiles and steel surface condition2012In: Nordic Concrete Research, ISSN 0800-6377, Vol. 45, p. 111-124Article in journal (Other academic)
  • 266.
    Silva, Nelson
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Tang, Luping
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Application of LA-ICP-MS for meso-scale chloride profiling in concrete2013In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 46, no 8, p. 1369-1381Article in journal (Refereed)
    Abstract [en]

    Chloride represents a major risk for reinforced concrete structures because at a certain concentration, it can promote depassivation of the steel bars and initiate corrosion. Therefore it is important to be able to measure the chloride content in concrete. In this paper the application of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) for the study of chlorides in concrete is proposed. This scanning technique enables quick multi-element profiling, directly at the sample without the need for further preparation, within a range of sub-millimetre (meso-scale) resolution and with low limits of detection. Optimization of the operating conditions was performed in pressed concrete powder pellets. Linearity of the calibration was verified and limits of detection below 0.05 wt% of cement were determined. Chlorine, calcium and iron distributions were studied in cement based materials of increasing heterogeneity (paste, mortar and concrete). This technique is furthermore proposed for the study of the chloride induced corrosion process, by following element distributions along the concrete-steel interface at the time of depassivation.

  • 267.
    Silva, Nelson
    et al.
    Chalmers University of Technology, Sweden.
    Tang, Luping
    Chalmers University of Technology, Sweden.
    Lindqvist, Jan Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Boubitsas, Dimitrios
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Chloride profiles along the concrete-steel interface2013In: International Journal of Structural Engineering, ISSN 1758-7328, Vol. 4, no 1-2, p. 100-112Article in journal (Refereed)
    Abstract [en]

    The composition and microstructure of the concrete-steel interface influences the critical chloride content for initiation of pitting corrosion and these characteristics may differ from those of the bulk concrete. This paper describes the development of a methodology for chloride profiling along the interface by means of LA-ICP-MS. For semi-quantitative analysis, microstructure characterisation of the pitting positions and distribution and composition of the corrosion products, SEM-EDS and XRD techniques were employed. The results indicate that along the interface a range of chloride levels can be expected. These varied between 0.15-1.5 wt% of concrete with higher levels around the active corrosion sites. Good agreement has been found between the results from LA-ICP-MS and EDS techniques. Interface defects strongly influenced the pitting corrosion. Several Fe(III) oxy-hydroxides accumulated at the aggregate-paste interface and in air voids at the cement paste. XRD analysis suggested the presence of akaganeite and FeCl2 (rokuhnite).

  • 268. Skoglund, Pål
    et al.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Chloride redistribution and reinforcement corrosion in the interfacial region between substrate and repair concrete: a laboratory study2008In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 41, no 6, p. 1001-1014Article in journal (Refereed)
  • 269.
    Stenbeck, Torbjörn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Budgeting Performance-Based Winter Maintenance: Snow influence on highway maintenance cost2009In: Journal of Infrastructure Systems, ISSN 1076-0342, E-ISSN 1943-555X, Vol. 15, no 3, p. 251-260Article in journal (Refereed)
  • 270. Stenbeck, Torbjörn
    Quantifying effects of incentives in a rail maintenance performance-based contract2008In: Journal of construction engineering and management, ISSN 0733-9364, E-ISSN 1943-7862, Vol. 134, no 4, p. 265-272Article in journal (Refereed)
  • 271.
    Stolen, Reidar
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Fire Research Norway.
    Fjellgaard Mikalsen, Ragni
    RISE - Research Institutes of Sweden, Safety and Transport, Fire Research Norway.
    Stensaas, Reidar
    RISE - Research Institutes of Sweden, Safety and Transport, Fire Research Norway.
    Solcelleteknologi og brannsikkerhet2018Report (Other academic)
    Abstract [en]

    The use of photovoltaic (PV) technology in Norway is increasing. In this study, fire safety challenges of PV technology are studied. Fire ignition, fire spread and fire extinguishing are investigated. The study forms a knowledge base for safeguarding fire safety during assembly, operation and during firefighting efforts, and to form unified and clear regulations. The results show:

    Fire ignition: PV installations contain many electric connections which can be potential ignition sources, as well as a small volume of combustible materials. These provide everything needed to initiate a fire. It is important that all connections in a PV installation are robust and can withstand the stress they are exposed to throughout their lifetime, without causing malfunction that could cause a fire.

    Fire spread: For building attached photovoltaics, there are cavities between the module and the building. If there is a fire in this cavity, the produced heat could be trapped, which could lead to a more rapid and extensive fire spread than if the building surface were uncovered. In large scale tests with PV modules mounted on a roof covering, the fire spread under the whole area covered with modules, but stopped when approaching the edge. This demonstrates the importance of sectioning when mounting PV installations, to avoid fire spread to the whole roof. An option is to use materials with limited combustibility as roof covering below the PV module, to withstand the increased heat exposure from the PV modules. The cavity between module and building could potentially also alter the air flow along the building, which in turn could affect the fire spread.

    Firefighting: Firefighters need information on whether there is a PV installation in the building, and where there are electrical components. During firefighting efforts, the fire service must consider the danger of direct contact, and danger of arcs and other faults that could lead to new ignition points. Fresh water can be used as an extinguishing agent. This must be applied from at least 1 meter distance with spread beam and at least 5 meters distance with a focused beam. PV modules can complicate fire extinguishing as they represent a physical barrier between the fire fighter and the area to extinguish, and by creating areas which should be avoided due to danger of components with voltage. When these points are considered, building attached photovoltaics should not be a problem.

    Further work: For building attached photovoltaics, there is little research on vertical mounting (on facades), and on how changed fire dynamics could affect fire spread and extinguishing. Also, today there is an increasing use of building integrated photovoltaics, which could potentially give many new challenges for fire safety and for regulations, as these are a part of the building and at the same time electrical components. German statistics indicate that there is an increased fire risk for these types of installations, compared to building attached photovoltaics, making this an important focus area for further work.

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    RISE-rapport2018_31_Solcellete_Brann
  • 272.
    Strothkämper, Christian
    et al.
    Physikalisch-Technische Bundesanstalt, Germany.
    Ferrero, A
    CSIC Agencia Estatal, Spain.
    Koo, A
    MSL Measurement Standards Laboratory of NZ, New Zealand.
    Jaanson, P
    VTT Technical Research Centre of Finland Ltd, Finland.
    Ged, G
    Conservatoire National des Arts et Métiers, France.
    Obein, G
    Conservatoire National des Arts et Métiers, France.
    Källberg, Stefan
    RISE - Research Institutes of Sweden, Safety and Transport, Measurement Science and Technology.
    Audenaert, J
    KU Leuven, Belgium.
    Lelaut, FB
    KU Leuven, Belgium.
    Martínez-Verdú, FM
    University of Alicante, Spain.
    Perales, E
    University of Alicante, Spain.
    Schirmacher, A
    Physikalisch-Technische Bundesanstalt, Germany.
    Campos, J
    CSIC Agencia Estatal, Spain.
    Multilateral spectral radiance factor scalecomparison2017In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 56, no 7, p. 1996-2006, article id 279674Article in journal (Refereed)
    Abstract [en]

    The field of spectral radiance factor (SRF) measurements has seen growing interest in recent years. Scale conformity has so far only been established between the national metrology institutes (NMIs) of Germany and the USA. This study aims at a bigger, multilateral scale comparison. For this purpose, a total of six NMIs participated in a scale comparison of goniospectrophotometers based on neutral and colored diffusely reflecting ceramics samples. In addition, two universities, providing a home-built gonioreflectometer and two widely used commercially available color measurement instruments, respectively, were involved. The wavelength range of the scale comparison covers the visible wavelength range from 380 nm to 780 nm. Results indicate systematic issues and that the uncertainty evaluation of the NMIs requires further work; although for the greatest part of the covered spectral range the agreement is good.

  • 273. Sundquist, Håkan
    et al.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Produktiviteten i anläggningsbyggandet måste drastiskt förbättras2012In: Samhällsbyggaren, ISSN 2000-2408, no 3, p. 26-30Article in journal (Other academic)
  • 274.
    Syverud, Kristin
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Alexandrescu, L.
    Gatti, A.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Belosi, F.
    Verifying the biocompatibility of cellulose nanofibril structures as a first step to develop filters for air-borne nanoparticles2013Conference paper (Refereed)
  • 275.
    Syverud, Kristin
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Alexandrescu, L.
    Manti, Canonico
    Gatti, A.
    Physical, chemical and biological characterization of a new nanostructured filtering membrane2012Conference paper (Refereed)
  • 276.
    Syverud, Kristin
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Salvatori, R.
    Gatti, A.
    Towards novel filter concepts for nanopollution2011Conference paper (Refereed)
  • 277.
    Syverud, Kristin
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Pettersen, S.
    Draget, K.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Controlling the elastic modulus of nanoengineered hydrogels by cross-linking cellulose nanofibrils2013Conference paper (Refereed)
  • 278.
    Syverud, Kristin
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Xhanari, K.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Yu, Y.
    Stenius, P.
    Films made of cellulose nanofibrils: surface modification by adsorption of a cationic surfactant and characterization by computer-assisted electron microscopy2011In: Journal of nanoparticle research, ISSN 1388-0764, E-ISSN 1572-896X, Vol. 13Article in journal (Refereed)
  • 279.
    Tahersamsi, Mohammad
    et al.
    Chalmers University of Technology, Sweden.
    Lundgren, Karin
    Chalmers University of Technology, Sweden.
    Plos, Mario
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB. Chalmers University of Technology, Sweden.
    Anchorage of naturally corroded bars in reinforced concrete structures2014In: Magazine of Concrete Research, ISSN 0024-9831, E-ISSN 1751-763X, Vol. 66, no 14, p. 729-744Article in journal (Refereed)
    Abstract [en]

    The bond properties of naturally corroded reinforced concrete members were experimentally investigated. Thirteen specimens were taken from the northern edge beam of Stallbacka Bridge, a girder bridge in Sweden. The specimens exhibited different levels of corrosion-induced damage, including concrete cracking and cover spalling. The damage was carefully documented and the specimens were tested in suspended four-point bending tests. Their general behaviour was monitored through measurements of applied loads and vertical deflections. At the same time, the local anchorage behaviour was recorded at the end regions. The test results showed around 5% lower anchorage capacity for damaged specimens compared with the reference ones. The residual bond strength was studied with respect to the observed damage. These tests, and artificial corrosion results from the literature, indicate that the bond strength decreased with increasing maximum splitting crack widths. However, the bond capacity was higher for the naturally corroded specimens. The results thus show an obvious difference between artificial and natural corrosion, and furthermore indicate that the provisions given in fib Model Code 2010 are on the safe side. These test results contribute to further knowledge regarding the structural behaviour of corroded reinforced concrete structures.

  • 280.
    Tammo, Kristian
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Energilagring i betong kan förbättras med nya material2010In: Betong, ISSN 1101-9190, no 5, p. 44-46Article in journal (Other academic)
  • 281.
    Tammo, Kristian
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Energilagringen i betong kan förbättras med andra material2010In: Betong, ISSN 1101-9190, no 5, p. 44-46Article in journal (Other academic)
  • 282.
    Tammo, Kristian
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Sprickvidder och deras inverkan på beständighet2010In: CBI-nytt, ISSN 0349-2060, no 2, p. 8-Article in journal (Other academic)
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    FULLTEXT01
  • 283.
    Tang, Luping
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Engineering expression of the ClinConc model for prediction of free and total chloride ingress in submerged marine concrete2008In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 38, no 8-9, p. 1092-1097Article in journal (Refereed)
  • 284.
    Tang, Luping
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB. Chalmers University of Technology, Sweden.
    Lindvall, Anders
    Thomas Concrete Group AB, Sweden.
    Validation of models for prediction of chloride ingress in concrete exposed in de-icing salt road environment2013In: International Journal of Structural Engineering, ISSN 1758-7328, Vol. 4, no 1-2, p. 86-99Article in journal (Refereed)
    Abstract [en]

    This paper presents the results from validation of models for prediction of chloride ingress in concrete exposed in de-icing salt road environment. Three models including the simple error-function complement (ERFC) model, the DuraCrete model and the ClinConc model, were evaluated using the measurement data collected from both the field exposure site after over ten years exposure and the real road bridges after 25-30 years in service. The sensitivity of input parameters in each model is analysed. The results show that, among different input parameters, the age factor is the most sensitive one. The simple ERFC model significantly overestimates chloride ingress. The DuraCrete model, if the input parameters are properly selected, may give a reasonably good prediction, otherwise often underestimates chloride ingress. The ClinConc model in general gives fairly good predictions for chloride ingress in de-icing salt road environment with heavy traffic at high speed.

  • 285.
    Tang, Luping
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB. Chalmers University of Technology, Sweden.
    Zang, Emma Qingnan
    Chalmers University of Technology, Sweden.
    Fu, Y.
    KTH Royal Institute of Technology, Sweden.
    Schouenborg, Björn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB. RISE Research Institutes of Sweden.
    Lindqvist, Jan Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Covercrete with hybrid functions: novel approach to durable reinforced concrete structures2012In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 63, no 12, p. 1119-1126Article in journal (Refereed)
    Abstract [en]

    Due to the corrosion of steel in reinforced concrete structures, the concrete with low water-cement ratio (w/c), high cement content, and large cover thickness is conventionally used for prolonging the passivation period of steel. Obviously, this conventional approach to durable concrete structures is at the sacrifice of more CO2 emission and natural resources through consuming higher amount of cement and more constituent materials, which is against sustainability. By placing an economically affordable conductive mesh made of carbon fiber or conductive polymer fiber in the near surface zone of concrete acting as anode we can build up a cathodic prevention system with intermittent low current density supplied by, e.g., the solar cells. In such a way, the aggressive negative ions such as Cl-, CO3 2-, and SO4 2- can be stopped near the cathodic (steel) zone. Thus the reinforcement steel is prevented from corrosion even in the concrete with relatively high w/c and small cover thickness. This conductive mesh functions not only as electrode, but also as surface reinforcement to prevent concrete surface from cracking. Therefore, this new type of covercrete has hybrid functions. This paper presents the theoretical analysis of feasibility of this approach and discusses the potential durability problems and possible solutions to the potential problems.

  • 286.
    Teofilusson, Gunilla
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Kursverksamheten CBI2014In: Svensk Bergs & Brukstidning, ISSN 0039-6435, Vol. 93, no 1Article in journal (Other academic)
  • 287.
    Teofilusson, Gunilla
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Regler kring utförande av betongkonstruktioner2012In: CBI-nytt, ISSN 0349-2060, no 1, p. 8-Article in journal (Other academic)
    Download full text (pdf)
    FULLTEXT01
  • 288.
    Trägårdh, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    ASR-problematik i Sverige och arbete på CBI Betonginstitutet2014In: CBI-nytt, ISSN 0349-2060, no 2, p. 3-4Article in journal (Other academic)
  • 289. Tschegg, Elmar
    et al.
    Jamek, Michael
    Fracture properties of marble-mortar compounds2008In: Bulletin of Engineering Geology and the Environment, ISSN 1435-9529, E-ISSN 1435-9537, Vol. 67, no 2, p. 199-208Article in journal (Other academic)
  • 290.
    Türe, Hasan
    et al.
    KTH Royal Institute of Technology, Sweden.
    Blomfeldt, Thomas O.J.
    KTH Royal Institute of Technology, Sweden.
    Gällstedt, Mikael
    RISE, Innventia.
    Hedenqvist, Mikael Stefan
    KTH Royal Institute of Technology, Sweden.
    Farris, Stefano
    University of Milan, Italy.
    Nanostructured silica/wheat gluten hybrid materials prepared by catalytic sol-gel chemistry2013In: Macromolecular Chemistry and Physics, ISSN 1022-1352, E-ISSN 1521-3935, Vol. 214, no 10, p. 1131-1139Article in journal (Refereed)
    Abstract [en]

    The main physicochemical properties of nanostructured silica/wheat gluten hybrid composites are presented. The extraction experiments suggest that the protein phase is intimately encased within the silica matrix, with silica-protein interactions driven by hydrogen bonding, as indicated by IR spectra. Spectroscopic results also show that silica induces a higher degree of constraint of the wheat gluten matrix, despite less aggregation. Moisture diffusion properties of the hybrid materials are investigated by a combined "desorption/sorption" approach. While the reduction of the moisture diffusivity in the presence of silica can be described by the geometrical impedance of a "sintered" porous solid, a time-dependent relaxation/restructuring of the composite apparently occurs during the sorption-desorption cycle.

  • 291. Ullsten, Henrik N.
    et al.
    Gällstedt, Mikael
    RISE, Innventia.
    Spencer, G.M.
    Johansson, E.
    Marttila, S.
    Ignell, R.
    Hedenqvist, M.S.
    Extruded high quality materials from wheat gluten2010In: Polymers from Renewable Resources, ISSN 20412479, Vol. 1, no 4, p. 173-186Article in journal (Refereed)
    Abstract [en]

    In this study, we report that the addition of ammonium hydroxide (NH4OH)significantly enhance the properties of extruded WG-based materials. The grainystructure disappeared and the extrudate became more uniform and glossy. Thebarrier properties improved and the oxygen permeability at dry conditions was aslow as that for a number of petroleum-based plastics (poly(ethylene terephthalateand polyamide 66). The protein structure in this material was extensivelyaggregated, which improved the strength and stiffness; there was a ca 4-foldincrease in maximum stress compared to that of the NH4OH-free samples. Theprotein solubility decreased to almost zero. Even a severe sonication treatmentin sodium dodecyl sulphate (SDS) did not increase the solubility. The only typeof protein that it was possible to extract was the ’thermo-resistant’ w-gliadinslacking disulfide-bonds. Our result provides new opportunities to develop a WGbasedfilm extrudate for potential use as e.g. a renewable barrier layer in foodand non-food laminate packagings.

  • 292. van Hees, R
    et al.
    Lindqvist, Jan Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    RILEM TC 203-RHM: Repair mortars for historic masonry.: From problem to intervention: a decision process2012In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 45, no 9, p. 1295–1302-Article in journal (Refereed)
    Abstract [en]

    This article focuses on repair or replacement mortars for historical buildings. Both the decision process and questions arising are dealt with, in order to better define and illustrate technical requirements for mortars to be used for the repair or restoration of monuments and historic buildings (masonry mortars, plasters, renders). The article summarizes a longer document, meant to help professionals in their decisions on the interventions, taking into account aspects, which are ranging from the ethics of restoration to the technical requirements

  • 293. Vogt, Carsten
    Ultrafina partiklar2010In: Betong, ISSN 1101-9190, no 4Article in journal (Other academic)
  • 294. Vogt, Carsten
    Ultrafina partiklar kan ersätta cement2010In: Betong, ISSN 1101-9190, no 4, p. 37-39Article in journal (Other academic)
  • 295. Wallin, Kjell
    Krossberg till bergkross: betongfundament med lokalt krossad ballast för världens största malmkvarnar2008In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, Vol. 100, no 7, p. 60-62Article in journal (Other academic)
  • 296.
    Wallqvist, Viveca
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioscience and Materials, Chemistry and Materials.
    Kjell, Gunnar B.
    RISE - Research Institutes of Sweden (2017-2019), Safety and Transport, Safety.
    Cupina, Ena
    RISE - Research Institutes of Sweden (2017-2019), Bioscience and Materials, Chemistry and Materials. Chalmers Univeristy of technology, Sweden.
    Kraft, Lars
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, CBI Swedish Cement and Concrete Research Institute.
    Deck, Caroline
    University of Strasbourg, France.
    Willinger, Rémy
    University of Strasbourg, France.
    New functional pavements for pedestrians and cyclists2017In: Accident Analysis and Prevention, ISSN 0001-4575, E-ISSN 1879-2057, Vol. 105, p. 52-63Article in journal (Refereed)
    Abstract [en]

    When many fields of pedestrian and cyclist safety have been extensively studied, the surfacing has long been left unquestioned, despite being developed for another mode of transport and being one of the main causes for falls and fall injuries. In this project new surfacing materials for pedestrian and cyclist safety have been produced. Focusing on augmenting previously largely disregarded parameters as impact absorption, comfort and visibility at the same time as avoiding deteriorating of crucial parameters as friction and wear resistance. Rubber content, binder type, and pigment addition have been varied and evaluated. The results demonstrate that by increasing rubber content of the mixtures the head injury criterion (HIC) value and injury risk can be decreased while maintaining frictional properties according to existing criteria. Assembly of test-lanes demonstrate that some developed materials experience lower flow and component separation than standard materials due to rubber addition, calling for further optimisation of construction procedure linked to content development. Initial trials on the test-lanes indicate that a polyurethane (PU) based material has high cycling comfort, visibility and can be modified with phosphorescence properties. For standard asphalt, impact absorption might be inflicted by modification of bitumen alone but is mostly augmented by rubber addition. The results also indicate that rubber content can decrease ice formation on the materials.

  • 297.
    Wallqvist, Viveca
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Kraft, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Prototype bike lanes - placement practices and properties2015In: 57º Congresso Brasileiro do Concreto, Bonito/MS [CBC 2015], IBRACON , 2015Conference paper (Other academic)
    Abstract [en]

    AstaZero, a unique environment to build any scenario in order to develop, test or certifynew traffic safety solutions was opened 2014 in Sweden. In this environment a testingarena for vulnerable road users has been developed. Among with the solutions testedbelongs impact absorbing surfaces for cyclists, one which has been made of rubbermodified concrete. The study involved testing of different compositions and examining newproperties in the fresh state, which affected the production process to different extents. Forexample, due to difference in density between aggregate and rubber the segregation maybe a problem. Regarding the materials properties, the head injury criterion (HIC) was usedfor evaluation of the pavements shock absorbing capability. In the laboratory tests themodified concrete demonstrated a decrease in HIC-value by 85% compared to standardbitumen material. In the AstaZero test-lane, measured at -1°C, the decrease in HIC-valuecompared to reference was 79%. The frictional properties were approved according toexisting criteria. Future tests will determine the new materials’ durability, maintenance andcycling comfort.

  • 298.
    Wang, Shuping
    et al.
    Chongqing University, China; Chalmers University of Technology, Sweden.
    Peng, Xiaoqin
    Chongqing University, China.
    Tang, Luping
    Chalmers University of Technology, Sweden.
    Zeng, Lu
    Chongqing University, China.
    Lan, Cong
    Chongqing University, China.
    Influence of inorganic admixtures on the 11 Å-tobermorite formation prepared from steel slags: XRD and FTIR analysis2014In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 60, p. 42-47Article in journal (Refereed)
    Abstract [en]

    Calcium silicate hydrate is synthesized from steel slag by adding lime and quartz by dynamic hydrothermal method at 185 C. The products mainly consist of disordered calcium silicate hydrate, but more crystallized phase such as 11 Å-tobermorite forms for the presence of inorganic admixtures. The formation of tobermorite is affected by the types of ions according to XRD and FTIR results. Adding 2% crystallized tobermorite is beneficial to form the ordered structure; alkali cations and SO4 2- anions are effective accelerators; Al3+ plays a role of stabilization during the reaction. The products also vary with the initial alkalinities of steel slag.

  • 299. Westerholm, Mikael
    et al.
    Lagerblad, Björn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Influence of fine aggregate characteristics on the rheological properties of mortars2008In: Cement & Concrete Composites, ISSN 0958-9465, E-ISSN 1873-393X, Vol. 30, p. 274-282Article in journal (Refereed)
  • 300. Williams Portal, Natalie
    et al.
    Fernandez Perez, Ignasi
    Pull-out of textile reinforcement in concrete2014In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 71, p. 63-71Article in journal (Refereed)
34567 251 - 300 of 312
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