The Modification of Fly Ash with Regional Clay in Thailand for Alternative Ceramic Product

Abstract

This research aims to study the modification of fly ash mixed with Dan Kwian clay, dolomite, feldspar, and kaolin for ceramic production. A triaxial blend model was chosen to design raw material content. Firing shrinkage, water absorption, and Rockwell hardness were applied for the specimen test. The incompatibility of mixed raw material illustrated the cracking, breaking, and deformation including the melting of specimens after the firing process. The tendency of firing shrinkage increases whereas water absorption decreases at higher temperatures. The reasonable mixed raw material obtaining dolomite, Dan Kwian clay, and fly ash of 60 wt%, 20 wt%, and 20 wt%, respectively, calcined at 1,200 ˚C served the stable firing shrinkage, relatively low water absorption, and the highest Rockwell hardness. The product of the ceramic plant pot fabricated as the preliminary test with the recommended condition demonstrated a satisfying smooth surface, strength, and shininess.