Patent US4828624 - Cement grinding aid compositions - Google .May 9, 1989 . Cement clinkers are ground in an aqueous environment using as a . 3,420,686 teaches that urea is an effective grinding aid and pack set.urea for cement grinding aid,Patent US3615785 - Cement grinding aid and pack set inhibitor .Oct 26, 1971 . The addition of a grinding aid enables the mill to grind the clinker to a .. However, urea may be used in larger amounts with other additives.Cement grinding aid compositionsAug 5, 1987 . using as a grinding aid, a composition comprising: Ingredients. Percent by Weight. A water-soluble glycol. 40-70. Urea as a 50% aqueous.
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