Processing additives for blended cements
AssigneeW. R. Grace & Co.-Conn.
InventorsEllis M. Gartner, David F. Myers, James M. Gaidis
Life of this patent
Estimating the term…
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% triisopropanolamine exhibit a marked increase in 7 and 28-day compressive strengths. The blended cements of this invention contain between 5 and 60% fillers or clinker substitutes. The triisopropanolamine strength enhancing additive may be admixed with the cement powder or may be interground with the cement clinker during finish milling.
Claims25
A strength enhanced blended cement comprising a mixture of clinker having at least 4% C.sub.4 AF, gypsum, 5% to 60% 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 triisopropanolamine.
A cement additive which enhances the strength of hydraulic blended cements which contain a mixture of 5 to 60% filler or clinker substitute and cement clinker having at least 4% C.sub.4 AF, comprising triisopropanolamine in an amount effective to enhance the 7 and 28-day compressive strength.
A process for enhancing the strength of hydraulic blended cements comprising, adding an effective amount of a strength enhancing additive to increase the 7 and 28-day strength of hydraulic blended cements which contain a mixture of 5 to 60% filler or clinker substitute and cement clinker having at least 4% C.sub.4 AF, wherein the additive comprises triisopropanolamine.
Dependencies are inferred from the claim text.