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

By E. Kamseu, L. M. B. À. Moungam, M. Cannio, N. Billong, D. Chaysuwan, U. C. Melo, C. Leonelli. 2017

205 citations recorded by the source corpus.

Abstract 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 ∼ 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 ∼75 vol% of RHA-NaOH based sodium silicate solution conducted to good polycondensation, densification, high flexural strength (∼8 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.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/3807512ea512d3a1338de83a304909aad44b8875

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Citations in the corpus

Environmental and economic perspective of waste-derived activators on alkali-activated mortars (2021, background): “RHA is rich in silica, approximately 90%, similarly to glass (Norsuraya et al., 2016; Tong et al., 2018) and has been considered a potential source of silicates for alkali-activated binders (Ghosh, 2013; Kamseu et al., 2017; Liu et al., 2016; Ma et al., 2012; Tong et al., 2018).”
Use of Vietnamese rice husk ash for the production of sodium silicate as the activator for alkali-activated binders (2018, unknown): “Research focussed mainly on the use of RHA-based silicate solutions for the activation of metakaolin, either neat metakaolin (Kamseu et al., 2017; Tchakouté et al., 2016a, 2016b) or metakaolin blended with other precursors such as slag (Bernal et al, 2012), water treatment sludge (Geraldo et al.,…”
Comparison of alkali and silica sources in one-part alkali-activated blast furnace slag mortar (2018, methodology): “Regarding conventional AAMs, sodium hydroxide solution and rice husk ash (RHA) (Kamseu et al., 2017; Passuello et al., 2017), mold cleaning solution waste from the aluminum industry (Fern andez-Jim enez et al., 2017), and waste glass dissolved in NaOH/Na2CO3 solution (Puertas and Torres-Carrasco,…”