Composition for improving freeze/thaw durability of masonry containing fatty acid-based efflorescence control agents
US6302955A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1999 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Oct 13, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/21
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A composition for improving the freeze thaw durability of masonry concrete comprising (i) an alkylaryl polyether alcohol having the formula R-.O slashed.-(OCH.sub.2 CH.sub.2).sub.x OH, wherein R is a C.sub.4 -C.sub.8 alkyl group (preferably branched), .O slashed. represents a phenol group, and "X" represents an integer in the range of 3-70; and (ii) at least one efflorescence control admixture, such as a C.sub.8 -C.sub.30 fatty acid or its salt or derivative. An exemplary masonry concrete composition of the invention comprises an alkylaryl polyether alcohol having the formula R-.O slashed.-(OCH.sub.2 CH.sub.2).sub.x OH, wherein R is a C.sub.4 -C.sub.8 alkyl group, .O slashed. represents a phenol group, and "X" represents an integer in the range of 3-70; the composition, when wet, having essentially zero slump when tested by the standard cone method for measuring slump. Methods of improving the freeze-thaw durability of masonry units are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.