Processing additives for blended cements
AssigneeW. R. Grace & Co.-Conn.
InventorsEllis M. Gartner, David F. Myers, James M. Gaidis
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Abstract
This invention relates to a method of enhancing the later age strength of certain blended cements. Under the process of this invention, certain blended cements, in particular those made from cement clinkers containing at least 4% C.sub.4 AF, when mixed with up to 0.2% of a higher trialkanolamine exhibit a marked increase in 7 and 28-day compressive strengths. The blended cements of this invention contain between 5 and 80% fillers or clinker substitutes. The higher trialkanolamine strength enhancing additive may be admixed with the cement powder or may be interground with the cement clinker during finish milling.
Claims21
A strength enhanced blended cement comprising a mixture of clinker having at least 4% C.sub.4 AF, gypsum, 5% to 80% by weight filler or clinker substitute together with an effective amount of a strength enhancing additive to increase the 7 and 28-day strength, wherein the additive comprises a higher trialkanolamine having at least one C.sub.3 -C.sub.5 hydroxyalkyl group.
A cement additive which enhances the strength of hydraulic blended cements which contain a mixture of 5 to 80% filler or clinker substitute and cement clinker having at least 4% C.sub.4 AF, comprising a solution of at least one higher trialkanolamine having at least one C.sub.3 -C.sub.5 hydroxyalkyl group and other cement admixtures selected from the group of accelerating admixtures, air entrainers, air detrainers, water reducing admixtures and retarding admixtures.
A process for enhancing the strength of hydraulic cement mixes formed from hydraulic blended cement comprising, adding an effective amount of a strength enhancing additive to increase the 7 and 28-day strength of the resultant hydraulic cement mix which contains a mixture of 5 to 80% filler or clinker substitute and cement clinker having at least 4% C.sub.4 AF, wherein the additive comprises at least one higher trialkanolamine.
Dependencies are inferred from the claim text.