Patent ID: 7820094
Filing Date: 2010-10-26
Classification: C04B,Y02W,Y10S

Abstract:
1. A method of placing concrete comprising: combining sand, one or more aggregates, cement, prepuff particles; water, and optionally a water reducer to form a mixture, making the mixture in, or placing the mixture in a cement mixer truck; mixing the mixture in the cement mixer truck while transporting the mixture from a central plant to a job site; and discharging the mixture from the cement mixer truck at the job site; wherein the mixture comprises: 8-20 volume percent cement, 11-50 volume percent sand, 10-31 volume percent prepuff particles, 9-40 volume percent coarse aggregate, and 10-22 volume percent water; wherein the prepuff particles have an average particle diameter of from 0.2 mm to 5 mm, a bulk density of from 0.02 g/cc to 0.48 g/cc, a continuous outer layer, and an aspect ratio of from 1 to 3; wherein the slump value of the mixture measured according to ASTM C 143 at the job site is from 2 to 8 inches.