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High strength cement pastes

Part 2 Reactions during setting

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Abstract

A study of the chemical reactions occurring in high strength cements is presented with particular reference to the cement-polymer interaction. The addition of small amounts (1.6%) of polyvinyl (alcohol/acetate) to the high alumina cement Secar 71 significantly retards the normal hydration reactions. At much larger doses (10% PVA) the crystalline hydrates are completely suppressed and the polymer reacts with the cement solution to form calcium acetate and a crosslinked polymeric product. In the case of high strength OPC/polyacrylamide pastes, the high pH of the cement solution converts the polymer to polyacrylic acid which reacts with the cations from the hydrated cement to form a crosslinked metal-polyacrylate. This latter system is analogous to reactions which occur in certain polyacrylic acid-based dental cements.

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Rodger, S.A., Brooks, S.A., Sinclair, W. et al. High strength cement pastes. J Mater Sci 20, 2853–2860 (1985). https://doi.org/10.1007/BF00553048

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  • DOI: https://doi.org/10.1007/BF00553048

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