Patent ID: 9028607
Filing Date: 2015-05-12
Classification: B01D,C04B,Y02C,Y02P

Abstract:
1. A process for preparing a controlled low-strength material having a compressive strength of 1200 psi or less, the process comprising: preparing a mixture including water and a cementitious material, wherein the cementitious material is selected from the group consisting of cement-kiln dust, lime-kiln dust, and slag cement; recovering exhaust gas from a combustion chamber, wherein the exhaust gas includes carbon dioxide; forming a foam including a foaming agent and the exhaust gas; mixing the foam into the mixture to form a foamed mixture; and thereafter allowing the foamed mixture to set to form the controlled low-strength material, wherein during the step of allowing the foamed mixture to set, the carbon dioxide in the exhaust gas reacts with hydration products in the controlled low-strength material to sequester carbon dioxide.