PRELIMINARY STUDY OF LOW-GRADE CLAY AS SECOND-ARY RAW MATERIAL FOR GEOPOLYMER

Abstract

The aim of this paper is to promote the use of low-grade clay as silicon and aluminum bearing material for geopolymer applications. This study presents definition of low-grade clay, sources and preliminary results of low-grade clay from waste of coal mining (coal gangue) and clay deposit. The results show low-grade clay contain kaolinite and amorphous below 20% with impurities more than 64% that has significant impact in term of reactivity. Thus, the preliminary result provided valuable idea and better understanding of low-grade clay in particular for reuse in geopolymer applications