Patent ID: 7799129
Filing Date: 2010-09-21
Classification: C04B,Y02W,Y10S

Abstract:
1. A high strength lightweight concrete having a compression strength greater than 2500 psi, comprising: (a) 1.05 to 1.75 parts by volume of Portland cement or shrinkage-compensating cement; (b) 0.40 to 1.25 parts by volume of pozzolan; (c) 1.15 to 1.85 parts by volume of fine sand with a particle size distribution meeting at least an ASTM C33 specification; (d) an amount of expanded lightweight aggregate with a compression strength less than 2500 psi effective to achieve between 6% to 18% volume of the total concrete volume, and a distribution mean size between 1 mm to 2.5 mm and with at least 75% of the amount of particles falling within +/−0.6 mm from a center of the distribution mean size; (e) 0.65 to 1.20 parts by volume of water effective to achieve a water to cement (W/C) ratio in the range of 0.27 to 0.60; (f) an amount of super-plasticizer effective to produce a target slump; (g) an amount of air entrainment admixture effective to produce 5% to 20% entrained air with a size distribution mean no larger than 70% of the distribution mean size of the expanded lightweight aggregate in the concrete; and (h) an amount of synthetic fiber effective to occupy up to 3.00% volume of the total concrete volume with a minimum tensile strength of 49,000 psi and a length between 5 mm to 18 mm.