Additives for cementitious materials
US4391645A · kind A · utility
19Cited by
9References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1982 |
| Grant date | Jul 5, 1983 |
| Priority date | — |
| Expiry date | Apr 12, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B28/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Superplasticizers with improved water reducing properties for cement, cement slurries, mortar, grout and concrete are formed from synergistic mixtures of (1) aromatic sulfonic acid formaldehyde condensates, such as the sodium salt of naphthalene sulfonic acid formaldehyde condensate and (2) hydroxy aromatic compounds such as pyrogallol and gallic acid. Addition of these mixtures to the same cementitious materials also results in improved compressive strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.