Experimental investigation on rice husk ash-based geopolymer mortar containing nano-metakaolin
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
Geopolymer is new class of cementitous materials, synthesized by mixing the almino-silicate
sources with alkaline activating solution. It is an eco-friendly innovative alternative to cement
which utilized various waste materials that are not reused in industries and urgent to dispose
of. The rice husk ash is an agricultural waste which is suitable for geopolymerisation. In this
study, influence of nano-metakaolin on rice husk ash based geopolymer has been
investigated. Eighteen mixes of geopolymer were prepared with three different molar
concentrations of alkaline activator (12M, 14M and 16M) and different proportion of nanometakaolin
(0% to10% @2% increment). Thee compressive strength was tested after 3, 7, 14
and 28 days of curing. The X-ray diffraction test was performed on the rice husk ash,
powdered sample of mixes K1, K7, K13 & K16. The powdered samples were collected from
remnants of geopolymer after 28 days compressive strength test. The Results reveal that
compressive strength of geopolymer increases for all curing ages when the concentration of
alkaline activator is raised from 12M to 16M but the proportion of nano-metakaolin increases
the strength up to certain limit. Beyond that there was reduction in compressive strength. The
compressive strength results were accomplished by X-ray diffraction analysis. The
geopolymer mortar prepared using 16M concentration of alkaline activator and 6% proportion
of nano-metakaolin is recommended for the maximum compressive strength.
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