Effect of NaOH Concentration on Flexural Strength, Phase Formation and Microstructural Development of Kaolin Geopolymer Ceramic

Abstract

This paper reports a detail study of the effect of NaOH concentration on flexural strength, phase formation and microstructural development of kaolin geopolymer ceramic. The NaOH concentration used ranged from 6 M to 14 M. The flexural strength showed the optimum value when NaOH concentration is 12 M. XRD analysis showed the formation of crystalline nepheline in all samples. Microstructural analysis showed formation of homogenous and denser structure in kaolin geopolymer ceramic as the NaOH concentration increase.