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

JOURNAL OF CLEANER PRODUCTION

卷:142

Article

Kamseu, E.^1,2  Beleuk a Moungam, L. M.²  Cannio, M.¹  Billong, Ndigui²  Chaysuwan, Duangrudee³  Melo, U. Chinje²  Leonelli, C.¹ 

[1] Univ Modena & Reggio Emilia, Dept Engn Enzo Ferrari, Via Pietro Vivarelli 10, I-41125 Modena, Italy

[2] Local Mat Promot Author MIPROMALO, POB 2396, Yaounde, Cameroon

[3] Kasetsart Univ, Dept Mat Engn, Fac Engn, 50 Ngamwongwan Rd, Bangkok 10900, Thailand

关键词: Rice husk ash;    Sodium silicate;    Geopolymer;    Sustainable;    Global warming potential;   

DOI  :  10.1016/j.jclepro.2016.10.164

来源: Elsevier

【 摘 要 】

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 similar to 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 similar to 75 vol% of RHA-NaOH based sodium silicate solution conducted to good polycondensation, densification, high flexural strength (similar to 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. (C) 2016 Published by Elsevier Ltd.

【 授权许可】

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