Patent ID: 8167996

Claim:
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 means meeting at least an ASTM C33 specification; (d) an amount of expanded lightweight aggregate of expanded perlite, expanded polystyrene or expanded vermiculite, or any combination thereof effective to achieve between 6% to 22% volume of a total concrete volume, and a particle size distribution mean between 1 mm to 3.5 mm with at least 75% of the amount of particles falling within 0.6 mm from a center of the particle size distribution mean; (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; and (g) an amount of air entrainment admixture effective to produce 5% to 20% entrained air cells with a cell size distribution mean no larger than 70% of the particle size distribution mean of the expanded lightweight aggregate in the concrete.