Patent ID: 7485184

Claim:
A method of reducing or eliminating the effect of fly ash or other combustible ashes on air entrainment in an air-entraining cementitious mixture, comprising the steps of: forming a cementitious mixture comprising water, cement, fly ash or another combustible ash, and an air entrainment agent, and entraining air in the mixture; wherein a sacrificial agent is also included in the cementitious mixture in at least the amount necessary to neutralize the detrimental effects of components of said fly ash or other combustible ash on air entrainment activity, the sacrificial agent comprising a material or mixture of materials that, when present in the same cementitious mixture without fly ash or the other combustible ash in said amount causes less than 2 vol. % additional air content in the cementitious mixture, wherein the sacrificial agent comprises an organic compound, with the proviso that said sacrificial agent does not comprise polyethylene glycol (PEG) or aromatic compounds having carboxylic acid groups, or salts thereof.