Rare earth modifiers for Portland cement
US4619702A · kind A · utility
14Cited by
5References
34Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 15, 1984 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | May 15, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B7/422
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Rare earth elements, added to the raw materials mixture fed to a cement kiln, produce cement compositions having increased early compressive strengths. Preparation of such cements requires less grinding of clinkers to achieve equivalent early strengths than similar compositions without the rare earth elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.