Patent ID: 8852337

Claim:
A fiber reinforced cement based mixed material, comprising: Portland cement having a weight C, a mineral admixture having a weight A, and wherein the Portland cement and the mineral admixture have a combined weight Y, wherein the mineral admixture chemically reacts in the presence of the Portland cement, and wherein the mineral admixture includes one of, or a combination of, silica fume, precipitated silica, ground granulated blast furnace slag, ground blast furnace slag, ground air-cooled blast furnace slag, fly ash, volcanic ash, diatomaceous earth, clay silicate, trass, an expansive additive, ground limestone, an ettringite-forming admixture, anhydrite, a polymer dispersion, and redispersible polymer powder obtained from a polymer dispersion, water, a chemical admixture which includes one of, or a combination of, a high-range water-reducing agent, an air-entraining and high-range water-reducing agent, a plasticizing agent, an anti-foaming agent, a setting accelerating agent, a setting retarding agent, a thickening agent, a shrinkage reducing agent, a quick setting agent, a foaming agent, and a rust-preventive agent, aggregate having a weight S, and fibers in an amount at least sufficient to reinforce the mixed material, and wherein a weight ratio WR of the weight S of the aggregate to the combined weight Y of the Portland cement and the mineral admixture is 50 to 95%, wherein a mean particle diameter of the aggregate is 0.2 to 0.8 mm, and wherein at least some of the fibers have asperities formed in a surface thereof, and wherein the fibers that have the asperities have recessed portions, and wherein a ratio (h/H) of a depth h of each of the recessed portions to a smallest cross-sectional diameter H of the fibers that have the asperities is 0.05 to 0.8.