Metakaolin as supplementary cementitious material - Optimization of kaolin to metakaolin conversion

被引：150

作者：

Badogiannis, E ^{[1
]}

Kakali, G ^{[1
]}

Tsivilis, S ^{[1
]}

机构：

[1] Natl Tech Univ Athens, Sch Chem Engn, Inorgan & Analyt Chem Lab, GR-15773 Athens, Greece

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2005年 / 81卷 / 02期

关键词：

cementitious materials; heat treatment; kaolin; metakaolin; minerals; pozzolanic activity;

D O I：

10.1007/s10973-005-0806-3

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In this paper the optimization of the kaolin calcination is studied, aiming at using the produced metakaolin as supplementary cementitious material. Representative samples of poor Greek kaolin (Milos island) and a high purity commercial kaolin were tested. Samples were heated at different temperatures during different times. The optimization of calcination conditions was studied by DTA-TG and XRD analysis of the raw and thermal treated kaolin samples, by pozzolanic activity analysis of metakaolins and finally by strength development analysis of cement-metakaolin mixtures. This approach showed that heating at 650 degrees C for 3 h is efficient to convert poor kaolins with low alunite content to highly reactive metakaolins. However in the case of kaolin with a high alunite content, thermal treatment at 850 degrees C for 3 h is required in order to remove undesirable SO3. Evidence was found that poor kaolins can be efficiently used for the production of highly reactive metakaolins.

引用

页码：457 / 462

页数：6