PARAMETRIC STUDY ON THE COMPRESSIVE STRENGTH OF RICE HUSK ASH (RHA) GEOPOLYMER MORTAR

Niko Rizaldi, Alvin Defarian, Attika Luqyana Hawes, Marlaily Idris, Arief Rijaldo Fajri, Monita Olivia

Abstract


Rice husk is available abundantly as low economy waste material in Riau Province. Rice husk ash (RHA) contains silica (Si) and alumina (Al) that are excellent sources of geopolymer material. Silica and alumina will be activated using sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) or alkaline solution. This research aims to study parameters that affecting rice husk ash and investigate the compressive strength of RHA geopolymer mortar. The research was carried out by examining of the rice husk ash properties, coarse aggregate, and fine aggregates. The geopolymer mortar was prepared by mixing the rice husk ash with the alkaline solution and cast it in 5x5x5 cm mould with a rest period of 3 days. Research parameters were temperature (70oC and room temperature), NaOH (12M, 14M, 16M, and 18M) and rice husk ash condition (dry surface/Saturated Surface Dry or SSD and dry). The results show that the RHA geopolymer mortar produced the highest compressive strength of 20 MPa using dry ash, 12M NaOH and curing at 70oC in an oven. It can be concluded that the low NaOH dosage and high curing temperature could produce solid and high compressive strength of the geopolymer mortar.

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