Determination of the Effect of the Addition of Pumice on the Technological Properties of Wall Tile Using the Factorial Design Method

摘要

In this study, the effects of the addition of pumice which has alkali and silica rich content on wall tile product properties were investigated using a factorial experimental design. A 22x31 mixed-level factorial experimental design was used to determine the effect of three main factors and interactions between them on wall tile product characteristics. Instead of pegmatite, ground pumice was added at different amounts to the standard wall tiles recipe and five compositions were prepared. Factors affecting the properties of the product were selected as pumice grinding time (10 and 15 minutes), the amount of pumice (0%, 7% and 14%) and firing temperature (1100°C, 1150°C). Linear shrinkage, water absorption, bulk density, total porosity and flexural strength values of samples were measured and the microstructures were investigated. As the amounts of pumice were increased, the amount of the glassy phase was escalated while the total porosity and water absorption values were decreased, bulk density values was increased. Pumice addition instead of pegmatite caused the dissolution of anorthite crystals in the microstructure, facilitating a decline in the amount of anorthite crystals with its high alkaline content and flexural strength values decreased accordingly. The grinding time and the amount of pumice were found to be active on examined features such as the main factors and also the interaction factor.