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  • 1.
    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.

  • 2.
    Kauppi, A
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Andersson, KM
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Bergström, L
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Probing the effect of superplasticizer adsorption on the surface forces using the colloidal probe AFM technique2005In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 35, p. 133-140Article in journal (Refereed)
    Abstract [en]

    The interactions between adsorbed superplasticizer layers have been studied using direct force measurements, with an atomic force microscope. MgO was used as a nonreactive model system for cement, and a novel freeze granulation method for the production of spherical particles suitable for the colloidal probe atomic force microscope (AFM)-technique is reported. We found that the interactions induced by the adsorption of the anionic acrylic ester–ethylene oxide (AAE–EO) copolymers can be described as electrosteric, with an electrostatic and steric contribution. The range of the steric repulsion varied between 1.5 and 5 nm and could be related to the length of the grafted ethylene oxide chains. The lignosulfonate also induced a significant steric contribution that could be related to a dense coil conformation of the adsorbed superplasticizer

  • 3. Lindgård, Jan
    et al.
    Nixon, Philip J
    The EU “PARTNER” Project — European standard tests to prevent alkali reactions in aggregates: final results and recommendations2010In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 40, no 4 Special Issue, p. 611–635-Article in journal (Refereed)
  • 4.
    Roussel, Nicolas
    et al.
    University of Paris-Est, France.
    Gram, Annika
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Hållbara byggnadsverk.
    Cremonesi, Massimiliano
    Polytechnic University of Milan, Italy.
    Ferrara, Liberato
    Polytechnic University of Milan, Italy.
    Krenzer, Knut
    IAB Weimar GmbH, Germany.
    Mechtcherine, Viktor
    TU Dresden, Germany.
    Shyshko, Sergiy
    TU Dresden, Germany.
    Skocec, Jan
    Heidelberg Cement Technology Center GmbH, Germany.
    Spangenberg, Jon
    DTU Technical University of Denmark, Denmark.
    Svec, Oldrich
    DTU Technical University of Denmark, Denmark.
    Nyholm Thrane, Lars
    Danish Technological Institute, Denmark.
    Vasilic, Ksenija
    BAM Federal Institute for Material Research and Testing, Germany.
    Numerical simulations of concrete flow: A benchmark comparison2016In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 79, p. 265-271Article in journal (Refereed)
    Abstract [en]

    First, we define in this paper two benchmark flows readily usable by anyone calibrating a numerical tool for concrete flow prediction. Such benchmark flows shall allow anyone to check the validity of their computational tools no matter the numerical methods and parameters they choose. Second, we compare numerical predictions of the concrete sample final shape for these two benchmark flows obtained by various research teams around the world using various numerical techniques. Our results show that all numerical techniques compared here give very similar results suggesting that numerical simulations of concrete filling ability when neglecting any potential components segregation have reached a technology readiness level bringing them closer to industrial practice.

  • 5.
    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)
  • 6.
    Tang, Luping
    et al.
    Chalmers University of Technology, Sweden .
    Boubitsas, Dimitrios
    RISE Research Institutes of Sweden.
    Huang, Liming
    Chalmers University of Technology, Sweden; Tongji University, China.
    Long-term performance of reinforced concrete under a de-icing road environment2023In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 164, article id 107039Article in journal (Refereed)
    Abstract [en]

    In the middle of 1990, over 30 different mixes of concretes with eight different binders and water-binder ratios of 0.3 to 0.75 were exposed to a highway environment with a heavy de-icing salt spread for the examination of long-term performance, including chloride penetration, reinforcement corrosion and frost attack. This paper presents the results from this long-term study regarding chloride penetration and reinforcement corrosion. The results show that the chloride penetration in concretes under a de-icing salt road environment is much weaker than that in concretes under marine splash environment in Sweden. The estimated critical chloride content for the corrosion initiation is about 0.3 % by mass of binder for rebars with uncracked concrete cover. Considering the chloride redistribution in the surface zone, ClinConc model has been modified so that it can present a better description of the chloride profiles in the concretes at such an exposure site. © 2022 The Author(s)

  • 7.
    Zandi, Kamyab
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Utgenannt, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Experimental study of the material and bond properties of frost-damaged concrete2011In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 41, no 3, p. 244-254Article in journal (Refereed)
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