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AssigneeBoral Material Technologies Inc.
InventorsRussell L. Hill, Carmel R. Jolicoeur, Monique Page, Ioan Spiratos, Thi Cong To
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A method of producing cementitious mixtures containing fly ash as one of the cementitious components, under air entrainment conditions. The method involves forming a mixture comprising water, cement, fly ash, optionally other cementitious materials, aggregate, conventional chemical admixtures, and an air entrainment agent and agitating the mixture to entrain air therein. Additionally, at least one sacrificial agent is also included in the mixture. The sacrificial agent is a material or mixture of materials that is not required to act as an air entrainment agent but interacts preferentially with components of the fly ash that otherwise neutralize, repress or depress the activity of the air entrainment agent. The invention includes cementitious mixtures and hardened concretes resulting from the method and fly ash treated with sacrificial agent, or air entrainment agent/sacrificial agent combinations, and processes for selecting suitable sacrificial agents.
An air-entraining cementitious mixture comprising fly ash or another combustible ash that reduces or eliminates the effect the fly ash or other combustible ash has on air entrainment in the air-entraining cementitious mixture;
An air-entraining cementitious mixture comprising fly ash or another combustible ash that addresses the variance of carbon content in fly ash used in cementitious compositions to provide a cementitious composition with a substantially constant level of air entrainment, the air-entraining cementitious mixture comprising air, water, cement, fly ash, an air entrainment agent and a sacrificial agent,
An air-entrained hardened cementitious mass comprising fly ash or another combustible ash that reduces or eliminates the effect the fly ash or other combustible ash has on air entrainment in the air-entrained hardened cementitious mass, the air-entrained hardened cementitious mass comprising air, cement, fly ash, an air entrainment agent and an amount of a sacrificial agent, wherein the sacrificial agent is present in at least an amount necessary to neutralize the detrimental effects of components of the fly ash or the other combustible ash on air entrainment activity in the air-entraining cementitious mixture, the sacrificial agent comprising a material or mixture of materials that, when present in a cementitious mixture without fly ash or another combustible ash in said amount causes less than 2 vol. % additional air content in the cementitious mixture,
Dependencies are inferred from the claim text.