Study on the Effect of Microsilica on the Asbestos-free fiber reinforced Cement-based Materials and Pore Structure

摘要

The microsilica have long been considered as the effective admixture in the high performance concrete, and also the Asbestos-free fiber reinforced cement-based materials is employed in the important role in the field of building materials. Our study is mainly to research the effect of microsilica on the Asbestos-free fiber reinforced cement-based Materials, and its pore structure is been tested. Influential factors involved in the research are: (1) the effect of microsilica on properties of FRC materials. (2) The type and amount of fiber effect on the FRC materials. (3) The character of pore structure and interface structure between fiber and matrix. (4) The effect mechanical of microsilica on the fiber reinforced cement-based materials. The results indicate that the rupture strength of the FRC materials is increase as the microsilica was added. The increasing degree depends on the type of fiber in the cement-based materials. It is hard to dewater during vacuum filtration as the microsilica was added, which make produce more residue moisture in the FRC materials. The effect of microsilica on pore structure becomes complex.