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Effect of nano calcium carbonate / limestone composite particles on hydration products and pore structure of cementitious materials

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Document pages: 8 pages

Abstract: The agglomeration of nano calcium carbonate (NC) is the biggest bottleneck in the application of cement-based materials. If nano calcium carbonate modifies the surface of micron limestone powder (LS), nano calcium carbonate limestone composite particles (NC LS) will be formed. It is well known that micron limestone is easy to disperse, and the "dispersion " of NC is controlled by LS. Therefore, NC LS can improve the dispersion of nano calcium carbonate in cementitious materials. In this work, NC LS was prepared in a three neck flask using Ca (OH) 2-h2o-co2 reaction system. The morphology of NC LS was observed by field emission scanning electron microscope (FE-SEM). The effect of NC LS on the hydration products and pore structure of cementitious materials was proposed. Add 5 NC LS into cement paste and mortar, and the mechanical properties of the specimens were measured at a certain age. Differential scanning calorimetry (DSC), thermal gravimetric analysis (TG), and backscattered electron imaging (BSE) were conducted on the specimens to investigate the hydration products and pore structure. The properties of specimens with NC LS were compared to that of control specimens (without NC LS). The results revealed that NC LS reduced the porosity and improved the mechanical properties of the cementitious materials.

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