Abstract
Grog is an additive material that plays important roles in ceramic making. It improves the fabrication process of green bodies as well as the physical properties of fired bodies. Few low-cost materials and wastes have found their application as grog in recent years, thus encouraging the replacement of commercial grogs with cost-saving materials. Coal fly ash, a combustion waste produced by coal-fired power plant, has the potential to be converted into grog owing to its small particle sizes and high content of silica and alumina. In this study, grog was derived from coal fly ash and mixed with kaolin clay to produce ceramics. Effects of the grog addition on the resultant ceramics were investigated. It was found that, to a certain extent, the grog addition reduced the firing shrinkage and increased the total porosity of the ceramics. The dimensional stability of the ceramics at a firing temperature of 1200 °C was also not noticeably affected by the grog. However, the grog addition in general had negative effects on the biaxial flexural strength and refractoriness of the ceramics.
Highlights
Grog traditionally refers to a small granular material composed of aggregate made from crushed brick or other fired ceramic
The general objective of this study is to investigate the feasibility of using Coal fly ash (CFA) as grog in the preparation of kaolin clay ceramic
The experimental results showed that CFA derived grog (CFAG) has significant impacts on the mineralogy of fired ceramics
Summary
Grog traditionally refers to a small granular material composed of aggregate made from crushed brick or other fired ceramic. A non-plastic material, is usually added to ceramic green bodies to improve the fabrication process as well as the physical properties of the fired bodies [1]. Grog is used to increase pore space in the green body to enable quicker venting of water vapor during drying and gases of decomposition during firing [1,2]. Given that grog is normally pre-fired, its body in general does not undergo a drying shrinkage or firing shrinkage. Grog can be used to improve fired abrasion resistance, reduce thermal expansion, reduce density and give distinct visual characteristics to the fired bodies [4,5]
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