Integrally waterproofed concrete
View Patent ↗An exemplary composition for enhancing water repellency in cementitious material comprises a hydrophobic material solute that is dissolved in a glycol ether solvent. Thus, the composition is provided in the form of a non-aqueous solution or emulsion wherein water is in a noncontinuous phase. The use of such compositions to modify cementitious compositions and the cementitious materials obtained thereby are also described.
1. A liquid admixture composition for enhancing water repellency in a cementitious material, comprising:
a solute portion of said liquid admixture composition having at least one hydrophobic material selected from butyl stearate, butyl oleate, or mixture thereof, which is operative to enhance water repellency in cementitious material; and
a non-aqueous solvent portion of said liquid admixture composition having at least one glycol ether selected from the group consisting of di(oxypropylene)glycol-t-butyl ether, di(oxypropylene)glycol-n-butyl ether, or mixture thereof, which non-aqueous solvent portion inhibits drying shrinkage in cementitious material;
said solute and solvent portions being present in said liquid admixture composition in a ratio of 95:5 to 5:95; said solute and solvent portions being mixed uniformly together by dissolving said at least one hydrophobic material in said solvent before combining with a hydratable cementitious material, said solute and solvent portions of said liquid admixture composition thereby forming a non-aqueous solution or an emulsion wherein water, if present, is present as a non-continuous phase;
said uniformly-mixed-together solute/solvent liquid admixture composition being effective, when combined with a hydratable cementitious material, to provide water repellency in a structure formed when the hydratable cementitious binder is combined with water and allowed to harden; and
said liquid admixture composition comprising water in an amount of 0%-5% based on total weight of said liquid admixture composition.
2. The composition of claim 1 wherein said composition is devoid of water.
3. The composition of claim 1 wherein, in said composition, said solute and said solvent are present in a ratio of 70:30 to 30:70.
4. The composition of claim 1 wherein, in said composition, said solute comprises a butyl oleate and a butyl stearate.
5. The composition of claim 4 wherein, in said composition, said butyl oleate and butyl stearate are present in an amount no less than 30 percent and in an amount no greater than 50 percent based on dry weight total solids in said composition.
6. The composition of claim 1 further comprising di(oxypropylene)glycol, di(oxyethylene)glycol, or mixture thereof.
7. The composition of claim 1 wherein, in said composition, said at least one solvent is operative to detrain air.
8. The composition of claim 1 wherein said composition further comprises at least one comb polymer superplasticizer.
9. The composition of claim 1 further comprising at least one comb polymer superplasticizer having poly(oxyalkylene) groups.
10. The composition of claim 1 wherein said composition is in the form of a non-aqueous solution.