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I have found, in accordance with the invention, that a certain class of substances, the substituted glycerols have marked effectiveness as grinding aids and that as such, they are decidedly superior to other substances commonly used for that purpose. The substituted glycerols not only greatly increase ease of grinding, but they also improve, in general, the properties of the finished cement. This is another important advantage over the usual grinding aids since use of the latter frequently results in impairment of some of the desirable properties of the cement, such as color, setting and strength qualities,zenith sand making machine and expansion on hardening. The present cement shows setting and strength properties that are at least as-favorable as, and in some instances more favorable than the corresponding properties of the same cement lacking the grinding aid material, and ground using the same amount of energy. It is to be understood that for the purposes of the invention, I may use any suitable substituted glycerol, or combination thereof, depending upon considerations such as the composition of the clinker or clinker mixture and the particular substituted glycerol that may be found to give the desired or best results in the finished cement. By substituted glycerols I refer generally to glycerol derivatives formed by substituting for any one of the OH radicals, a suitable element or group, such as one of the halogens or organic ester groups.

Examples are glycerol monochlorohydrin and other like halogen substitution compounds; also glycerol mono acetic ester and other corresponding esters of the ethyl, propyl, butyl series. Glycerol mono acetic ester is known also as monoacetin, which has the alpha and beta isomeic forms, either or both of which are suitable. The substituted glycerol grinding aid may be interground with the clinker in any suitable proportions. Ordinarily, the percentage thereof will not exceed 0.50% by weight of the cement, and preferably...