The optimum mix ratio of local materials in Nakhon Si Thammarat for the production of low-temperature refractory bricks
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Abstract
The objective of this research was to determine the optimum mix ratio of local materials in Nakhon Si Thammarat for the production of low-temperature refractory bricks. The mixture was composed of Thung Nam Khem red clay, Thung Yai kaolin, Nam Kap sand, raw husk, husk ash and cow dung. The mix ratio was determined using a square table and the physical properties of the bricks were tested. The results showed that the optimum mix ratio was 40:10+15:15+5:15, which was fired at 950°C. The bricks had the following physical properties: 1) thermal conductivity of, 2) shrinkage of 16.5%, 3) porosity of 32.7%, 4) surface level 4 and 5) modulus of rupture of 25.24 kg/cm2
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