Low porosity cement and process for producing same
US3960582A · kind A · utility
8Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1975 |
| Grant date | Jun 1, 1976 |
| Priority date | — |
| Expiry date | Apr 21, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B28/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method is disclosed for making low-porosity, free-flowing cement pastes with extended set times, improved workability and reduced expansion due to alkali aggregate reactions by combining hydraulic cements, especially portland-type cements, ground without gypsum with from 0.1 to about 1.0% of an alkali or alkaline earth lignosulfonate or sulfonated lignin, and 0.1 to 2.0% of an alkali bicarbonate, and combining with 20 to 40% water. Mixtures of aggregates with such low-porosity pastes made according to this process produce very workable mortars and concretes with extended set times and upon hardening have reduced expansion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.