Investigating the impact of rice husk ash on the properties of non-load-bearing kaolin concrete blocks

Abstract

The objective of this research was to develop non-load-bearing concrete blocks from kaolin by using rice husk ash, a pozzolan material obtained from a power plant in Suphanburi province, instead of kaolin sourced from Ranong province, to reduce costs and pollution by utilizing local raw materials. This research tested substitution ratios of 0, 5, 10, 15, 20 and 25 percent by weight. It was found that using rice husk ash instead of kaolin reduces the density of kaolin concrete blocks. Additionally, kaolin concrete blocks with 5 percent rice husk ash exhibited the highest compressive strength compared to other substitution ratios. When considering the qualifications of non-load-bearing concrete blocks by engineering standards such as compressive strength, water absorption, and length change, which have been certified by TIS. 58-2560, the mixtures that meet the criteria consisted of kaolin concrete blocks mixed with rice husk ash at ratios of 0, 5, 10 and 15 percent by weight. This research suggests methods to enhance construction materials, focusing on cost reduction, compliance with standards, and environmental friendliness.