Set retardant for hydraulic cement compositions
US8317916B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 2010 |
| Grant date | Nov 27, 2012 |
| Priority date | — |
| Expiry date | Feb 9, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A zinc-oxide based set retardant additive and admixture for use in Portland cement or other hydraulic cement mixtures. The admixture may comprise silica fume, vitreous calcium aluminosilicate, magnesium aluminum silicate hydrate, a cellulose ether derivative, or their equivalents. The zinc-oxide based set retardant may be interground or pre-blended, pre-packaged, or added on the jobsite, as an admixture, additive, or addition. The zinc-based set retardant may be subsequently added or mixed into a ready mix or wet mixture of portland cement or other hydraulic cement, sand and/or aggregate, with or without fillers, and water, with or without other pozzolans or polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.