This invention relates to a method of producing enhanced strength portland cements. Under the process of this invention, certain portland cements, in particular those containing at least 4% C.sub.4 AF and up to 0.2% of a strength enhancing additive comprising triisopropanolamine, exhibit a marked increase in 7 and 28 day compressive strength. The triisopropanolamine strength enhancing additive may be admixed with cement powder or may be interground as a grinding aid with cement clinker during finish milling.
Strength enhancing additive for certain portland cements
Myers, D., & Gartner, EM. (1992). Strength enhancing additive for certain portland cements. (U.S. Patent No. 5084103). http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=5084103