Patent ID: 7744692

Claim:
A lightweight cementitious composition comprising from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.028 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3, and having a continuous outer layer, and from 10 to 50 volume percent of sand and/or other fine aggregate, wherein at least a portion of the sand and/or other fine aggregate has a fineness modulus of less than 2; wherein the sum of components used does not exceed 100 volume percent; wherein the cementious composition has a density of from about 40 to about 130 lb./ft 3 ; and wherein after the lightweight cementitious composition is set for seven days, the composition has a compressive strength of at least 1700 psi as tested according to ASTM C39.