Patent ID: 6395205
Filing Date: 2002-05-28
Classification: C04B,Y02W

Abstract:
A method of manufacturing an aerated autoclaved concrete material, the method comprising the steps of:preparing a quick-stiffening mixture by combining a silica containing material, modified quicklime, a rising agent, gypsum, cement and water; depositing the quick-stiffening mixture into a mold and allowing it to form a stiffened body; removing the stiffened body from the mold and placing the stiffened body in an autoclave station in which the stiffened body is steam cured at elevated temperature and pressure; wherein the modified quicklime which is used to form the quick-stiffening mixture is modified with a chemical modifier, wherein the chemical modifier is selected from the group consisting of water, glycerol, polyacrylates, phosphoric acid, carboxylates, sucrose and mixtures thereof to provide a desired degree of chemical reactivity in the quick-stiffening mixture; wherein the chemical modifier is used to pretreat the quicklime prior to the addition of modified quicklime to the quick-stiffening mixture; and wherein the relative reactivity of the quicklime is controlled by adding the chemical modifier in an amount sufficient to slow the initial 10 second heat rise of the quicklime to approximately 5 degrees C during subsequent slaking as measured according to ASTM C-110.