Cement admixture product

An improved cement comprising a essentially uniform mixture of a hydraulic cement and from 0.01 to 2 weight percent based on the weight of said hydraulic cement of an imidized acrylic polymer represented by the structure of:

• ##STR3## wherein each R independently represents hydrogen atom or a methyl (CH.sub.3 --) group;
• R' represents a hydrogen atom or a C.sub.2 -C.sub.10 oxyalkylene group represented by (BO).sub.n R" in which O represents an oxygen atom, B represent C.sub.2 -C.sub.10 alkylene group or mixtures thereof, R" represents a C.sub.1 C.sub.10 alkyl and n represents an integer of from 1--200, or mixtures thereof;
• A represents hydrogen atom, a C.sub.1 -C.sub.10 alkyl group, R' or an alkali metal, alkaline earth or ammonium cation or a mixture thereof;
• HZ.sup..sym. represents an ammonium cation wherein Z is a group X.sub.2 N (BO).sub.z R'" such that X represents hydrogen, (BO).sub.z R'" or mixtures thereof and R'" represents H,, C.sub.1 -C.sub.10 alkyl group or BNH.sub.2 ;
• B represents a C.sub.2 -C.sub.10 alkylene group or mixture of said groups and z is from 5 to 200;
• and a, b, c, d and e are numerical values representing molar percentage of the polymers structure such that a is a value of about 50 to 90;
• the sum of c+d is a value of from about 2 to the numerical value of [100-(a+e)];
• and b is not more than [100-(a+c+c+e)];
• and e is a value of from 0.1 to about 10.