Patent ID: 9145337
Filing Date: 2015-09-29
Classification: C04B,Y02W

Abstract:
1. A fiber reinforced cement based mixed material comprising: 100 parts by weight of cement, 5 to 30 parts by weight of silica fume, 35 to 80 parts by weight of at least one pozzolanic material excluding the silica fume, 5 to 25 parts by weight of limestone powder, at least one chemical admixture, water, 70 to 150 parts by weight of aggregate having a largest aggregate diameter of 1.2 to 3.5 mm and wherein a mean particle diameter of the aggregate particles of 0.2 to 0.8 mm, and fibers, wherein at least some of the fibers comprise a fiber having asperities formed in a surface thereof, the fiber having asperities being formed such that a ratio (h/H) of a depth h of each of recessed portions among the asperities to a smallest cross-sectional diameter H thereof is 0.05 to 0.8, wherein the Blaine specific surface area of the limestone powder is not less than 3,000 cm wherein the sum content of (1) the limestone powder and (2) the at least one pozzolanic material excluding the silica fume is 57 to 88 parts by weight.