Patent ID: 6267814
Filing Date: 2001-07-31
Classification: C04B

Abstract:
A cementitious dry cast mixture consisting essentially of hydraulic cement, coarse aggregate, fine aggregate, a dispersant, and optionally at least one of a pozzolan, a pigment, a set accelerator, a set retarder, a defoaming agent, an air detraining agent, a water repellant agent, and a water reducing agent, wherein the dispersant has the general structure consisting essentially of: ##STR2##where: D=a component selected from the group consisting of the structure d1, the structure d2, and mixtures thereof;X=H, CH.sub.3, C.sub.2 to C.sub.6 Alkyl, Phenyl, Substituted Phenyl such as p-Methyl Phenyl, Sulfonated Phenyl;Y=H, --COOM;R=H, CH.sub.3 ;Z=H, --SO.sub.3 M, --PO.sub.3 M, --COOM, --OR.sub.3, --COOR.sub.3, --CH.sub.2 OR.sub.3, --CONHR.sub.3, --CONHC(CH.sub.3).sub.2 CH.sub.2 SO.sub.3 M, --COO(CHR.sub.4).sub.n OH where n=about 2 to about 6;R.sub.1, R.sub.2, R.sub.3, R.sub.5 are each independently --(CH2CHRO).sub.m R.sub.4 random copolymer of oxyethylene units and oxypropylene units where m=about 10 to about 500 and wherein the amount of oxyethylene in the random copolymer is from about 60% to 100% and the amount of oxypropylene in the random copolymer is from 0% to about 40%;R.sub.4 =H, Methyl, C.sub.2 to about C.sub.6 Alkyl, about C.sub.6 to about C.sub.10 aryl;M=H, Alkali Metal, Alkaline Earth Metal, Ammonia, Amine, Substituted Amine such as triethanol amine, Methyl, C.sub.2 to about C.sub.6 Alkyl;a=0 to about 0.8;b=about 0.2 to about 1.0;c=0 to about 0.5;d=0 to about 0.5; andwherein a, b, c, and d represent the mole fraction of each unit and the sum of a, b, c, and d is 1.0.