Activated koalin powder compound for mixing with cement and method of preparing the same
US6290771A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 9, 1999 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Mar 9, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B14/106
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The activated kaolin powder compound is prepared from naturally-existing kaolin (hereinafter "natural kaolin"). The activated kaolin powder compound is prepared by heating natural kaolin to 480.degree. C. within at most one hour, calcinating the heated natural kaolin at high temperature by heating in the range of 800.about.950.degree. C. over at least 15 minutes, quenching the calcinated kaolin with water or air, and pulverizing the quenched activated kaolin to give powder having particle sizes of 2 .mu.m or less, wherein the natural kaolin is primarily composed of halloysite (Al.sub.2 O.sub.3.2SiO.sub.2.4H.sub.2 O). The activated kaolin powder compound is employed in an amount of about 5 to 15% by weight of cement for preparing mortar or cement. The cement composition containing the activated kaolin powder compound can provide a mortar or concrete having excellent properties in compressive strength, flexural strength and water permeability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.