Claims
- 1. An improved cement admixture which inhibits drying shrinkage while substantially maintaining air void content of a treated cement composition comprising a mixture of (a) at least one alkyl ether oxyalkylene adduct represented by the formula RO(AO).sub.n H wherein A is a C.sub.2 -C.sub.4 alkylene radical, O is oxygen, R is a C.sub.1 -C.sub.7 alkyl or C.sub.5 -C.sub.6 cycloalkyl group, and n is an integer of 1 to 5; in combination with (b) an alkylene diol represented by the formula HOBOH wherein B is selected from a C.sub.5 -C.sub.10 alkylene group and wherein the weight ratio component (a) to component (b) of the mixture is 1:1 to 5:1.
- 2. The admixture of claim 1 wherein component (b) is selected from C.sub.5 -C.sub.8 alkylene diols having secondary or tertiary hydroxy groups or mixtures thereof.
- 3. The admixture of claim 1 wherein R represents a butyl group, A represents ethylene, propylene or mixtures thereof and n represents 2 or 3.
- 4. The admixture of claim 2 wherein R represents a butyl group, A is selected from ethylene, propylene or mixtures thereof, and n represents 2 or 3.
- 5. The admixture of claim 2 wherein component (b) is a C.sub.6 alkanediol having secondary or tertiary hydroxyl groups or mixtures thereof.
- 6. The admixture of claim 3 wherein component (b) is a C.sub.6 alkanediol having secondary or tertiary hydroxyl groups or mixtures thereof.
- 7. An improved cement composition comprising a hydraulic cement and from 0.1 to 5 weight percent of the admixture of claim 1, 2, 3, 4, 5 or 6.
- 8. The cement composition of claim 7 which further contains an effective amount of a cement air entraining agent to cause at least about 3 volume percent air in a treated and cured cement composition.
- 9. The cement composition of claim 8 which further contains sand, aggregate and water.
- 10. A method of inhibiting drying shrinkage of a cast hydraulic cement structure while substantially maintaining air void content therein comprising forming an unset cement composition comprising a hydraulic cement and from 0.1 to 5 weight percent of the admixture of claim 1, 2, 3, 4, 5, or 6, introducing a cement air entraining agent in an effective amount to provide at last about 3 volume percent air in the cured composition; casting the unset cement composition into a shape; and permitting said composition to cure.
Parent Case Info
This application is a continuation in part application of U.S. application Ser. No. 08/398,719 filed Mar. 6, 1995 and now abandoned.
US Referenced Citations (8)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
398719 |
Mar 1995 |
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