Strength performance of sodium hydroxide-activated fly ash, rice straw ash and laterite soil geopolymer mortar
Parea Rusan Rangan1, Rita Irmawaty2, A. Arwin Amiruddin2, Bambang Bakri2
University of Hasanuddin, Makassar, Indonesia
Abstract
The geopolymer of fly ash (FA), rice straw ash (RSA) and laterite soil (LS) was prepared. The strength of the geopolymer mortar with FA/RSA/LS percentage ratio of 41,67/16,67/41,67 was tested. The geopolymer was activated with sodium hydroxide (NaOH). Effect on air curing on compressive strength as well as the optimum mix proportion of geopolymer mortar was investigated. It is possible to achieve compressive strengths of 1.64 N/mm2, 1.72 N/mm2 and 3.22 N/mm2, respectively for the 12 M sodium hidroxide-activated geopolymer mortar after 3, 7 and 28 days of casting when air cured. Results indicated that the increase in curing period increased the compressive strength.
Keywords: fly ash, rice straw ash, laterite soil, geopolymer mortar
Topic: Waste to Energy Potential Resources