Change search
Refine search result
234567 201 - 250 of 314
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.
  • 201.
    Lagerblad, Björn
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Utkin, Peeter
    Silica granulates in concrete.: Dispersion and durability aspects1993Report (Refereed)
  • 202.
    Lagerblad, Björn
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Vogt, Carsten
    Ultrafine particles to save cement and improve concrete properties.2004Report (Refereed)
    Abstract [sv]

    Fine particles play an important role in both fresh and hardened concrete and are often added as filler to give concrete specific properties. For example the development of more efficient superplasticizer allows increased amount of fillers to be used, which in turn has resulted in the development of self-compacting concrete (SCC). In SCC particles less than mm are regarded as filler. _x000D_ _x000D_ Due to the new generations of very effective superplasticizers, it is today possible to include large amounts of even finer particles, particles much smaller (< 10 mm) than cement in size. These fillers here called ultrafillers. These ultrafillers will increase the strength of concrete and can thus act as a cement replacement. This is basically the effect behind CEM II/A-LL cement where the co-ground limestone due to the milling process will be an ultrafiller. In these cements the limestone filler has an efficiency factor of 1, i.e. the cement does not loose strength when substituted with UF. _x000D_ _x000D_ It is obvious that UF have other effects on concrete properties than ordinary fillers. It is also known from earlier work that different minerals have different influence on hydration properties. Thus several series of experiments with ultrafillers were conducted in order to obtain a better understanding of the reasons behind the effects and how they can be used in concrete production. The effect of different ultrafiller on hydration, paste structure, shrinkage and strength has been investigated. _x000D_ _x000D_ In the main experimental series quartz was chosen, as this mineral is easy to access and may act pozzolanic. Quartz in the size of cement, quartz finer than cement and ultrafine cristobalite quartz were tested. To compare it with other minerals, commercial ultrafine wollastonite and nepheline syenite (rock composed of nepheline and k-feldspar) were also tested. As quartz dust may result in silicosis, wet ground quartz was used in many of the experiments. . _x000D_ _x000D_ All the ultrafine particles resulted in a pronounced increase in strength. It is possible to replace up to 40 % of the cement and still obtain similar strength. The best effect is achieved, when the cement is replaced but the water/cement is kept constant. The main effect on the hardened concrete seems to be due to the fact that the small mineral grains become an integrated part of the hydrated cement paste instead of discrete particles. Moreover, the ultrafine particles result in a more homogeneous interfacial zone. Mercury intrusion tests show that the ultrafiller gives a finer pore system. Basically the strength increase is due to the fineness, but increases in long-term strength also indicate that fine quartz also acts as slow pozzolana. With an optimised recipe and only 150-kg cement concrete with a compressive strength of 80 MPa can be produced. With a combination of ultrafiller, cement and silica fume concrete with more than 100 MPa in compressive strength can be produced with only 180 kg of binder. _x000D_ _x000D_ The incorporation of ultrafine particles accelerates the cement hydration. The effect increases with the fineness. Some minerals like wollastonite and calcite influence the onset of the acceleration period but the major influence is on the heat release during the acceleration period. Comparison between different minerals and production forms of the ultrafiller shows that the surface of the ultrafiller and aging is of major importance. _x000D_ _x000D_ The results show that ultrafine fillers can replace a substantial amount of cement, which will reduce the environmental impact by reducing energy consumption and CO2 release. Much of the potential is, however, already taken into account by the introduction of CEM II/A-LL cement that contains ultrafine limestone, but it is possible to reduce the amount of cement even further. In this case cement is replaced with ultrafiller while the water/cement is kept constant. This, however, demands superplasticizer and the result is that cement is replaced by a combination of ultrafine filler and superplasticizer. The concept with ultrafiller is currently probably not economical for the bulk production of concrete. This is due to the cost of grinding and handling of the fine materials in concrete production. By the use of wet ground material as slurry it is possible to avoid silicosis and other dust problems. If ultra fine particles are available as a by-product, however, it may be commercially interesting. _x000D_ _x000D_ The ultrafine particles are, however, interesting when one want to produce concretes for special applications or environments. Interesting areas are where one wants a lower energy release (heat development), dense concretes and special high performance concretes or other cementitious products where one wants to keep the amount of cement down. For example one can produce high strength concrete with relatively small amounts of cement to avoid thermal cracking and shrinkage. Ultrafine fillers were found to be an important ingredient in formulating ultra high performance concretes (reactive powder concrete). _x000D_

  • 203.
    Larsson, Hans-Gunnar
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Nordin, Arne
    Skalbyggnadsteknik1995Report (Refereed)
  • 204.
    Liefvendahl, Tommy
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Samverkan mellan ytbetong och TT-element1976Report (Refereed)
  • 205.
    Lindh, Gunnar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Experimentell jämförelse mellan Lossiercement och standardcement i cementbruk1954Report (Refereed)
  • 206.
    Lundin, Torsten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Armeringens läge i element.: Enligt ritning och efter produktion1975Report (Refereed)
  • 207.
    Malmberg, Bo
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Betong med krossgrus som ballast.: En litteraturinventering1979Report (Refereed)
  • 208.
    Malmberg, Bo
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Skarendahl, Åke
    Polymer- och fiberförstärkning av betong1979Report (Refereed)
  • 209.
    Molin, Christer
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    A methods development study of localized cutting in concrete with careful blasting1984Report (Refereed)
  • 210.
    Molin, Christer
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Betong och ombyggnad: En översiktlig studie 19801986Report (Refereed)
  • 211.
    Molin, Christer
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Localized cutting in concrete with careful blasting.: Full-scale experiments in an old concrete building with a comparison of methods1983Report (Refereed)
  • 212.
    Molin, Christer
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Ombyggnadsrivning1980Report (Refereed)
  • 213.
    Molina, Larissa
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Measurement of high humidity in cementitious material at an early age1990Report (Refereed)
    Abstract [en]

    When assessing the moisture state in a cementitious material, measuring the relative humidity (RH) is preferable to other methods due to its universal value in connection with comparisons between different materials, between different degrees of maturity and in connection with the influence of other adjacent materials._x000D_ _x000D_ The use of capacitive RH meters requires an accurate and uniform methodology to achieve satisfactory accuracy and precision. A proposal for a methodology of this kind is provided in the present report. For materials at a very early age of maturity, the methodology has been developed for measuring the RH during 2 hours 45 minutes with an accuracy of up to + or - 1-1.7 % RH._x000D_ _x000D_ The use of capacitive RH meters requires that personnel be trained both in maintenance and measurement procedures._x000D_ _x000D_ For many cementitious materials, it takes a long time (days or weeks, depending on external conditions and the thickness of the material) to obtain the original RH level after drilling measurement holes. Consequently, the insertion of test tubes directly after casting is recommended. If this is not possible, or if the climatic conditions at the measurement site are difficult, it is preferable to measure the RH on material specimens taken in situ. This measurement can be carried out in a suitable environment, for example in a laboratory._x000D_ _x000D_ A detailed error analysis of the total rneasurement error is presented. This analysis can serve as a basis for calculations of the total measurement accuracy in connection with RH measurement under different external conditions and with different capacitive RH meters.

  • 214.
    Molina, Larissa
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    On predicting the influence of curing conditions on the degree of hydration1992Report (Refereed)
    Abstract [en]

    Maturity functions are not valid above a thirty-percent degree of hydration. The effects of moisture at an early age on the hydration process are still unclear. More information is needed about the relationship between compressive strength and the degree of hydration as a function of moisture state - or rather RH. Such information will help to improve the maturity function with regard to hydration._x000D_ _x000D_ The purpose of this paper is to evaluate the degree of hydration and the maturity of a cement-based material as functions of RH. A correlation is suggested between maturity and hydration above a certain degree. When a cement-based material is being cured in the air, hydration ceases as soon as the RH drops below a certain level, which appears to be about 80% according to Powers /9/._x000D_ _x000D_ Hitherto it has been extremely difficult to establish the degree of hydration at limited moisture levels for various cement-based materials. The RH of the material might drop critically at an early maturity age . There is, however, a serious lack of published data on the effects of microstructural development under partially saturated conditions. My purpose is to provide data on ordinary Portland cement pastes and mortars with w/c-ratios of 0.35, 0.5 and 0.75. With the help of a special technique which has been developed at CBI, such materials were transformed to various RH after certain initial curing times. The influence of additives is not considered in this study._x000D_ _x000D_ After a certain period of hydration at the new RH, changes in hydration and microstructure were analysed for non-evaporable water and by quantitative X-ray diffraction._x000D_ _x000D_ This study shows the sometimes striking influence of drying or partially saturated conditions on the reduction of the rate of hydration, the final degree of hydration and the microstructure.

  • 215.
    Möller, Göran
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Petersons, Nils
    Behov av forskning och utredningar för att underlätta export av svenskt betongbyggande.: Programutredning.1982Report (Refereed)
  • 216.
    Möller, Göran
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Ysberg, Greger
    Erfarenheter från kontrollen vid tillverkningskontrollerade betongfabriker1988Report (Refereed)
  • 217.
    Nielsen, Knud E C
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Loads on reinforced concrete floor slabs and their deformations during construction: Final report1952Report (Refereed)
  • 218.
    Nielsen, Knud E C
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Measurements of water vapour pressure in hardened concrete1967Report (Refereed)
  • 219.
    Nielsen, Knud E C
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Temperature measurements with thermistors in concrete1959Report (Refereed)
  • 220.
    Nielsen, Knut E C
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Aggregate stresses in concrete1971Report (Refereed)
  • 221.
    Norberg, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Dimensionering av oarmerade betongvägar med finita element-programmet ILLI-SLAB1991Report (Refereed)
  • 222.
    Nordfelth, Lars
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Nyman, Bertil
    Het betong.: En metod för betonggjutning vintertid1987Report (Refereed)
  • 223.
    Nygårds, Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Svensson, Christer
    Vakuumbehandling av betong i horisontala konstruktioner: rapport från en undersökning1975Report (Refereed)
  • 224.
    Nyman, Bertil
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Ökning av omloppshastigheten för gjutbäddar i elementfabriker1986Report (Refereed)
  • 225.
    Nyman, Bertil
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Johansson, Arne
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Produktionsmetoder vid gjutning av betonggolv1986Report (Refereed)
  • 226.
    Petersons, Nils
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Bedömning av betongens kvalitet i färdiga konstruktioner1967Report (Refereed)
  • 227.
    Petersons, Nils
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Bedömning av betongens kvalitet i färdiga konstruktioner: Några praktiska fall1973Report (Refereed)
  • 228.
    Petersons, Nils
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Betongens kvalitet i färdiga konstruktioner1973Report (Refereed)
  • 229.
    Petersons, Nils
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Concrete strength in precast elements1973Report (Refereed)
  • 230.
    Petersons, Nils
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Korrosion av värmelednings- och luftcirkulationsrör ingjutna i betong1965Report (Refereed)
  • 231.
    Petersons, Nils
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Produktion, transport och bearbetning av betongmassa.: Exempel på nuläge, forskning och utveckling: föredrag vid CBI:s informationsdag 19751976Report (Refereed)
  • 232.
    Petersons, Nils
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Ready mixed concrete in Sweden1977Report (Refereed)
  • 233.
    Petersson, Örjan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Beskrivande text för betongbeläggningar1995Report (Refereed)
  • 234.
    Petersson, Örjan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Dimensionering av armerad betongbeläggning för uppställningsplatser för flygplan1996Report (Refereed)
  • 235.
    Petersson, Örjan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Dimensionering av oarmerad betongbeläggning för uppställningsplatser för flygplan1995Report (Refereed)
  • 236.
    Petersson, Örjan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Dimensionering av oarmerade betongvägar1990Report (Refereed)
  • 237.
    Petersson, Örjan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Förslag till betongbeläggning för Arlanda flygplats, rullbana III1995Report (Refereed)
  • 238.
    Petersson, Örjan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Rapport om betongbeläggningars status på de militära flygplatserna i Ängelholm, Såtenäs, Hultsfred, Linköping och Luleå2000Report (Refereed)
  • 239.
    Petersson, Örjan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Trapetsformat tvärsnitt för betongvägar1994Report (Refereed)
  • 240.
    Petersson, Örjan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Tunn pågjutning av betong på gammal beläggning.: Nytt koncept2001Report (Refereed)
  • 241.
    Petersson, Örjan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Billberg, Peter
    Effects of the second generation of superplasticizers on concrete properties1995Report (Refereed)
    Abstract [en]

    Since the first superplasticizer was used for the first time work has been done to obtain more efficient products. The superplasticizer used today may be said to belong to the second generation of products. The concrete is said to have smaller slump losses and a higher short-term and final strength using the new generation of superplasticizer. An other aim of the development was to make the superplasticizers innocuous from a health point of view by minimizing or completely removing the formaldehyde content. _x000D_ _x000D_ The aim of the research project was both to test some of the second generation of superplasticizers and to try to express the concrete's rheology in fundamental parameters, such as yield stress and plastic viscosity. These parameters were measured using various viscometers. For concrete, the CBI's BML viscometer was used and for mortar (Dmax = 0.25 mm), the Institute for Surface Chemistry (YKI) tested with their paste viscometer, the Bohlin Controlled Stress Rheometer. The results were compared with those obtained using more traditional methods, such as slump, remoulding value and spread. Evaluation of slump losses was done using interpolation between slump test values at different times after mixing. Testing was also done of the air content, compressive and splitting strength, shrinkage and, in the case of concrete with a water/cement ratio of 0.60, also the temperature development and the time necessary before power floating/trowelling. _x000D_ _x000D_ Five different superplasticizers and a water-reducing product were tested and compared. The superplasticizers are based on different active substances, such as melamine, naphthalene, polymers and one with a mixture of copolymer and melamine. The water-reducing agent is based on lignosulphonate. _x000D_ _x000D_ Concretes with three different water/cement ratios, 0.45, 0.55 and 0.60, were tested. The concrete material was proportioned so that the initial slumps for the three were about 70 mm. Two different mixing orders of components and admixtures were tested. Mixing alternative A involved coarse aggregate and cement being dry mixed, after which water and half the amount of admixture were added and then the gravel. This was then mixed for two minutes and allowed to rest for two minutes, after which the second half of the dose of superplasticizer was mixed in. The concrete was then mixed for a further two minutes before testing was started. Mixing alternative B involved all components and superplasticizer being poured into the mixer at the same time and mixed for three minutes. _x000D_ _x000D_ The various consistency tests and air content tests were performed five minutes after mixing. At this time, samples were also taken for strength and shrinkage tests. The concrete that was tested was poured back into the mixer, which was run some revolutions. The concrete was covered with plastic and permitted to rest until the time for the next test. _x000D_ _x000D_ The test batches were made using three different cements. Most were made using cement types called S and D. The different cements vary as regards chemical composition and particle size distribution. Cement S is the most finely ground, with a Blaine fineness of 460 m2/kg, a C3A content of 8% and alkalinity expressed in equivalent Na2O of 1.10%. Cement D is a coarse, low- alkali cement with a Blaine fineness of 300 m2/kg, C3A content of 1.6% and equivalent Na2O of 0.47%. Cement FD is a more finely ground variant of cement D, with a Blaine fineness of 400 m2/kg, C3A content of 1.0% and equivalent Na2O of 0.47%. _x000D_ _x000D_ The results for the traditional consistency testing of concrete with a low water/cement ratio shows that the superplasticizers are generally 20 to 35% more effective with cement D than with cement S. The necessary doses for a certain consistency are lower when cement D is used. That is because cement C has a considerably higher C3A content which adsorbes the superplasticizer molecules more rapidly. Cement D is also more coarsely ground which gives a higher molecule concentration on the surface of the cement grains. _x000D_ _x000D_ Different superplasticizers exhibit different effects depending on the dose and cement sort. The completely or partly polymer-based superplasticizer has lower slump losses at normal dose than the others. If the slump loss is counted as the time for reduction of the initial slump by 30 mm, these products in combination with cement S have about 15 to 20 minutes longer time than the other. This implies almost a doubling of the time. In combination with cement D, the corresponding time is 8 to 17 minutes, or 44 to 130% longer. The differences are not as great at half the normal dose. The slumps five minutes after mixing with cement S varied widely. _x000D_ _x000D_ In testing the "building concrete" with cement S, at a water/cement ratio of 0.60, the slumps were controlled to 180 and 230 mm respectively. This enabled comparison of the superplasticizers on the basis of the same initial slump. These tests exhibited even more clearly that the wholly or partly polymer-based superplasticizers provide the best effect on both consistency and slump losses. _x000D_ _x000D_ The complementary tests on retardation also showed that these polymer-based products retard the setting of the concrete to a certain extent. For example, the time before power trowelling increased by about 2-2.5 hours for these products, for the dose to achieve full flow. But it must be said that the other products also provided a longer hardening time, varying between 1 and 2 hours with doses for full flow. _x000D_ _x000D_ The short-term strength was measured after 24 hours. No greater strength was generally noted in concretes with superplasticizers. _x000D_ _x000D_ The strength after 28 days varies basically with the measured air content in such a way that the cases in which the air content was lower than for the reference the strength was also higher. In the case of cement D and a normal dose of superplasticizer, all the measured strengths were higher than the reference. In corresponding case with cement S, the results were not the same. With cement S, superplasticizers appear to increase the air content slightly at normal dosing. _x000D_ _x000D_ Measurement of shrinkage shows that concretes containing superplasticizer shrink less than the corresponding reference concrete. The reason may be that the superplasticizer's liquid phase is included in the water/cement ratio as contributing to the cement's hydration. If the liquid phase does not contribute to the hydration, the calculated water/cement ratio is overestimated. The concrete's shrinkages also decreases with a smaller water content. _x000D_ _x000D_ In all cases in which mixing alternative A were compared with mixing alternative B, alternative A exhibited the better effect, both as regards the initial slump and the change in slump. _x000D_ _x000D_ This investigation of superplasticizers shows that a major change of positive effects on concrete properties as to be called second generation of superplasticizers can only be those containing polymers partly or completely. _x000D_

  • 242.
    Petersson, Örjan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Johansson, Arne
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    En undersökning av slitstark vägbetong med frilagd ballast1995Report (Refereed)
  • 243.
    Petersson, Örjan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Johansson, Arne
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Optimal konsistens för brobetong1992Report (Refereed)
  • 244.
    Petersson, Örjan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Johansson, Arne
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Provväg av cementbetong vid Arlanda, 1990: Betongmaterial1991Report (Refereed)
  • 245.
    Petersson, Örjan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Johansson, Arne
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Styrning av glättningshårdhet1991Report (Refereed)
  • 246.
    Petersson, Örjan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Norberg, Jan
    Betong på asfalt: En state-of-the-art report1991Report (Refereed)
  • 247.
    Petersson, Örjan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Sundbom, Sven
    Tidigare trafikering av betongbeläggning1993Report (Refereed)
  • 248.
    Petersson, Örjan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Sundbom, Sven
    Uppföljning av betongväg E4.65 vid Arlanda efter 3 år.: Betongmaterial1994Report (Refereed)
  • 249.
    Petersson, Örjan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Sundbom, Sven
    Uppföljning av betongvägen Heberg - Långås.: Byggnadsrapport 1993 : betongmaterial och fogar1994Report (Refereed)
  • 250.
    Petersson, Örjan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, CBI - Cement- och betonginstitutet.
    Westling, Malin
    Sammanfattningar från Seminarium.: Betongbeläggningar på flygfält1998Report (Refereed)
234567 201 - 250 of 314
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