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Effect of high-range water reducer-viscosity enhancing admixture combination on rheological properties of concrete equivalent mortar
For this study, a parallel plate rheometer was used to characterize the rheological properties of CEM made with 300 micrometer nominal-size sand particles. The CEM was proportioned with different VEA-HRWRA combinations. The case of polycarboxylate-based HRWRA was studied to determine the coefficient B corresponding to the thixotropic breakdown. For each mixture, the equilibrium shear rate of 70 s-1 was determined. It was demonstrated that for the same consistency, the naphthalene-based HRWRA can develop a lower equilibrium viscosity than the polycarboxylate-based HRWRA. This testing protocol can then be used to select efficient combinations of HRWRA-VEA in cement-based materials.
Effect of high-range water reducer-viscosity enhancing admixture combination on rheological properties of concrete equivalent mortar
For this study, a parallel plate rheometer was used to characterize the rheological properties of CEM made with 300 micrometer nominal-size sand particles. The CEM was proportioned with different VEA-HRWRA combinations. The case of polycarboxylate-based HRWRA was studied to determine the coefficient B corresponding to the thixotropic breakdown. For each mixture, the equilibrium shear rate of 70 s-1 was determined. It was demonstrated that for the same consistency, the naphthalene-based HRWRA can develop a lower equilibrium viscosity than the polycarboxylate-based HRWRA. This testing protocol can then be used to select efficient combinations of HRWRA-VEA in cement-based materials.
Effect of high-range water reducer-viscosity enhancing admixture combination on rheological properties of concrete equivalent mortar
Ghezal, A. (author) / Khayat, K.H. (author) / Beaupre, D. (author)
2002
6 Seiten, 5 Bilder, 2 Tabellen, 12 Quellen
Conference paper
English
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Method of the concrete equivalent mortar (CEM) - A new tool to design concrete containing admixture
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