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Substitution of sodium silicate with rice husk ash-NaOH solution in metakaolin based geopolymer cement concerning reduction in global warming

By Elie Kamseu, L. M. Beleuk \ue0. Moungam, Maria Cannio, Ndigui Billong, Duangrudee Chaysuwan, U. Chinje Melo and Cristina Leonelli


Rice husk ash (RHA), a by-product from the rice industry, was used as principal source of amorphous silica for the production of sodium silicate solution (MR 3c 3) used for the replacement of standard commercial sodium silicate in the mix-design of metakaolin based geopolymer composites. Three initial concentrations of NaOH were considered (8, 10 and 12 M) with the aim to investigate on the optimum dissolution and formation of silica oligomers capable to act as binder during the geopolymerization. Results (FT-IR and XRD) showed that RHA-NaOH sodium silicate solutions have characteristics similar to that of standard commercial sodium silicate and the residual carbonates present in the viscous pastes can be monitored during the preparation of geopolymers using the mix-design. Combined 25 vol% standard sodium silicate solution with 3c75 vol% of RHA-NaOH based sodium silicate solution conducted to good polycondensation, densification, high flexural strength ( 3c8 MPa) and low porosity similar to that of the standard matrix of metakaolin based composites. The new approach is found promising for the significant reduction of the Global Warming Potential of Geopolymers

Topics: Geopolymer, Global warming potential, Rice husk ash, Sodium silicate, Sustainable, Renewable Energy, Sustainability and the Environment, Industrial and Manufacturing Engineering
Publisher: 'Elsevier BV'
Year: 2017
DOI identifier: 10.1016/j.jclepro.2016.10.164
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