Physical properties and thermal conductivity of soil geopolymer block

Abstract

Abstract This research aimed to study the mixing ratios of fly ash and rice husk ash on the physical properties and thermal conductivity of soil geopolymer block. Fly ash to rice husk ash ratios for this experiment were 100:0, 80:20, 70:30, 50:50, 30:70, 20:80 and 0:100 %wt, respectively. The properties analysis of soil geopolymer block such as the compressive strength, water absorption, apparent porosity, bulk density and thermal conductivity were tested. The results indicated that soil geopolymer block of 80:20 %wt at 28 days of curing gave the maximum compressive strength of 131.43 kg/cm2. The minimum water absorption of 7.70 %, minimum bulk density of 2, 056.34 kg/cm3, minimum apparent porosity of 15.64 %, minimum thermal conductivity of 1.8674 W/m.K, were obtained. The compressive strength of soil geopolymer block increased up to 87 % and the thermal conductivity has decreased to 35 % compared to commercial cement block. The compressive strength, the water absorption and the bulk density of 80:20 %wt mixtures was in accordance with the standard product community at 602/2547 that can be used in construction applications.