A lightweight cementitious composition containing from 22 to 90 volume percent of a cement composition and from 10 to 78 volume percent of particles having 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, an aspect ratio of from 1 to 3, where after the...http://www.google.de/patents/US7964272?utm_source=gb-gplus-sharePatent US7964272 - Lightweight compositions and articles containing such
