Patent ID: 8460457

Claim:
A process for preparing a hydratable cement, comprising: introducing to cement clinker, before, during, or after the grinding manufacturing process whereby the clinker is ground to produce hydratable cementitious binder material, (a) at least one air-entraining cement additive in the amount of 0.0005% to 0.2% based on weight of clinker being ground, the at least one air-entraining cement additive comprising a tertiary alkanolamine, a lignosulfonic acid or salt thereof, naphthalene sulfonate formaldehyde condensate, melamine sulfonate formaldehyde condensate, a glycol, a glycerin, or mixtures thereof; and (b) an air-detraining ethoxylated, propoxylated fatty alcohol or alkylphenol represented by formula (I) or (II): CH 3 (CH 2 ) x CH 2 —O(CH 2 CH 2 O) n (CH 2 CH(CH 3 )O) m H (I) R 1 —R 2 —O(CH 2 CH 2 O) n (CH 2 CH(CH 3 )O) m H (II) wherein x represents an integer of =2-18; n and m each represent an integer of 3 to 15; R 1 represents an alkyl group having 4 to 12 carbons; and R 2 represents a benzene ring; the at least one air-entraining cement additive and the ethoxylated, propoxylated fatty alcohol or alkylphenol (both hereinafter EPFA) being present by weight within the ratio (tertiary alkanolamine: EPFA) of 19:1 to 1:1 by dry solids weight.