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- W2046560132 abstract "The influence of styrene–butadiene rubber (SBR) latex on cement hydrates Ca(OH)2, ettringite, C4AH13 and C–S–H gel and the degree of cement hydration is studied by means of several measure methods. The results of DSC and XRD show that the Ca(OH)2 content in wet-cured SBR-modified cement pastes increases with polymer–cement ratio (P/C) and reaches a maximum when P/C is 5%, 10% and 10% for the pastes hydrated for 3 d, 7 d and 28 d, respectively. With wet cure, appropriate addition of SBR promotes the hydration of cement, while the effect of SBR on the content of Ca(OH)2 and the degree of cement hydration is not remarkable in mixed-cured SBR-modified cement pastes. XRD results illustrate that SBR accelerates the reaction of calcium aluminate with gypsum, and thus enhances the formation and stability of the ettringite and inhibits the formation of C4AH13. The structure of aluminum-oxide and silicon-oxide polyhedron is characterized by 27Al and 29Si solid state NMR spectrum method, which shows that tetrahedron and octahedron are the main forms of aluminum-oxide polyhedrons in SBR-modified cement pastes. There are only [SiO4]4− tetrahedron monomer and dimer in the modified pastes hydrated for 3 d, but there appears three-tetrahedron polymer in the modified pastes hydrated for 28 d. The effect of low SBR dosage on the structure of aluminum-oxide and silicon-oxide polyhedron is slight. However, the combination of Al3+ with [SiO4]4− is restrained when P/C is above 15%, and the structure of Al3+ is changed obviously. Meantime, the polymerization of the [SiO4]4− tetrahedron in C–S–H gel is controlled." @default.
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- W2046560132 date "2006-09-01" @default.
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- W2046560132 title "Influence of polymer on cement hydration in SBR-modified cement pastes" @default.
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- W2046560132 doi "https://doi.org/10.1016/j.cemconres.2006.05.020" @default.
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