Patent ID: 7799127

Claim:
A high early strength engineered cementitious composition comprising the following ingredients with the amount shown in percent by weight: (a) a hydraulically settable cement—38.2% to 48.5% , including hydraulic calcium silicates; (b) a chemical accelerator admixture—1.3% to 2.0%; (c) matrix interactive fibers 1.1% to 1.9%, including a polyvinyl alcohol fiber; (d) non-matrix interactive crack initiators —1.7% to 2.9%, including polymer beads selected from the group consisting of polypropylene, polystyrene, polyethelene, and mixtures thereof; (e) one or more fine grained aggregates—28.6% to 47.7%, selected from the group consisting of sand, clay, fly ash, bauxite, shale, iron ore, and mixtures thereof; and (f) a chemical dispersant admixture—0.2% to 1.0%, including a super-plasticizer selected from the group consisting of melamine formaldehyde sulfonate, carboxylated polyether, polycarboxylates, and mixtures thereof; such that when mixed in a water to cement ratio of about 0.25 to 0.5, and allowed to set, a compressive strength of 21 MPa is attained within about 4 hours and a tensile strain of greater than about 2% is maintained after curing.