Properties of blended cements with thermally activated kaolin


Arikan M., Sobolev K., Ertuen T., Yeginobali A., Turker P.

CONSTRUCTION AND BUILDING MATERIALS, vol.23, no.1, pp.62-70, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 1
  • Publication Date: 2009
  • Doi Number: 10.1016/j.conbuildmat.2008.02.008
  • Journal Name: CONSTRUCTION AND BUILDING MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.62-70
  • Keywords: Kaolin, Metakaolin, Additive, Thermal activation, Cement, Compressive strength, Microstructure, POZZOLANIC ACTIVITY
  • Middle East Technical University Affiliated: Yes

Abstract

Kaolin, one of the materials of major importance for the ceramic and paper industry, is also used in the construction industry as a raw material for the production of white cement clinker and, in the form of metakaolin, as an artificial pozzolanic additive for concrete. Metakaolin is a vital component of high-performance and architectural concrete; however, its application in regular concrete is very limited due to relatively high production costs. This report evaluates the performance of a low-cost metakaolin-based additive called thermally activated kaolin (TAK), in cement. Due to its pozzolanic properties and the densification of cement matrix, the application of TAK provides a 15% improvement of the compressive strength. It was shown that TAK of optimal quality can be manufactured by the thermal treatment of raw kaolin with 74% of kaolinite at 750 degrees C without the intermediate beneficiation stage. The application of a developed approach can significantly reduce production expenditures and make the application of such an additive feasible even in regular-grade cement and concrete. (C) 2008 Elsevier Ltd. All rights reserved.