Patent ID: 7964272
Filing Date: 2011-06-21
Classification: C04B,E04B,E04C,Y02W,Y10T

Abstract:
1. A lightweight cementitious composition comprising expandable polymer particles arranged in a cubic lattice; wherein the composition comprises from 22 to 90 volume percent of a cement composition, and from 10 to 78 volume percent of expandable polymer particles having a substantially continuous outer layer, an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g/cc to 0.64 g/cc, and an aspect ratio of from 1 to 3; wherein the expandable polymer particles comprise expanded polymer particles having an inner cell wall thickness of at least 0.15 μm; wherein after the lightweight cementitious composition is set, has a compressive strength of at least 1700 psi as tested according to ASTM C39 after seven days; and wherein the cement is one or more selected from the group consisting of Portland cements, pozzolana cements, aluminous cements, magnesia cements, silica cements and slag cements.