Patent ID: 7648574
Filing Date: 2010-01-19
Classification: C04B,Y02W,Y10S

Abstract:
1. A method of controlling air entrainment in an article formed from a ready-mix concrete composition comprising: forming a concrete composition by: placing the mixture in a form; wherein the mixture comprises: wherein the prepuff particles are prepared by expanding a polymer bead having an unexpanded average resin particle size of from about 0.2 mm to about 1 mm to form prepuff particles that have an average particle diameter of from 0.2 mm to 2.5 mm, a bulk density of from 0.02 g/cc to 0.32 g/cc, an inner cell wall thickness of at least at least 0.15 μm, and an aspect ratio of from 1 to 3; wherein the void spaces in the prepuff particles entrain air in a structurally supportive manner; and wherein the slump value measured according to ASTM C 143 is from 2 to 8 inches; wherein after the ready-mix concrete composition is set for 28 days, has a compressive strength of at least 1800 psi as tested according to ASTM C39.