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Study on hydration modification of cement NS@PCE Core-shell nanoparticles

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Document pages: 13 pages

Abstract: It is generally believed that fine particles can accelerate the cement hydration process, or more specifically, this acceleration effect can be attributed to the additional surface area introduced by fine particles. In addition, the surface state of particles is also an important factor, especially for nanoparticles. In the previous study, a series of Nano-SiO2 polycarboxylate superplasticizer core-shell nanoparticles were prepared( NS@PCE )Nanoparticles with similar particle size distribution but different surface properties were synthesized. In this study NS@PCE The influencing factors of cement hydration were studied by heat flow calorimetry, mechanical properties test, XRD and SEM. The results show that in a series of NS@PCE , NS@PCE -The shell core seems to be more effective than a moderate 2ctive in accelerating cement hydration. As dosage increases, the efficiency of NS@PCE-2 would reach a plateau which is quantified by various characteristic values. Compressive strength results indicate that strength has a linear correlation with cumulative heat release. A hypothesis was proposed to explain the modification effect of NS@PCE, which highlights a balance between initial dispersion and pozzolanic reactivity. This paper provides a new understanding for the surface modification of supplementary cementitious materials and their application and also sheds a new light on nano-SiO2 for optimizing cement-based materials.

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