Geopolymer binders from metakaolin using sodium waterglass from waste glass and rice husk ash as alternative activators: A comparative study

By H. K. Tchakouté, C. Rüscher, Sakéo Kong, E. Kamseu, C. Leonelli. 2016

301 citations recorded by the source corpus.

Abstract Rice husk and waste glass from sources in Cameroon were used for producing sodium waterglass (NWG) solution denoted S1 and S2 respectively as alternative activators to prepare metakaolin-based geopolymer binder. Metakaolin-based geopolymer binders (G1, G2) were obtained using freshly prepared NWG with a mass ratio NWG/MK = 0.83. The IR spectra of S1, S2 using ATR and KBr methods show the presence of SiQ 0 , SiQ 1 , SiQ 2 units, and S1 contained also SiQ 3 and SiQ 4 units. The mechanical testing, environmental scanning electron microscopy, mercury intrusion porosimetry, X-ray diffractometry, infrared spectroscopy, amount of binders and thermogravimetric analysis are investigated to study the properties of the geopolymer binders. The results show that the compressive strength values of geopolymer G2 (22.9, 27.6, 32.6, 36 and 39.7 MPa) are higher than that of G1 (17.7, 19.1, 21.2, 29.9 and 32.8 MPa) at 7, 14, 21, 28 and 56 days respectively. The microstructure of G2 is more compact with fewer unreacted metakaolin particles. It can be concluded that sodium waterglass from waste glass and rice husk ash are suitable alternative activators for the production of metakaolin-based geopolymers. In addition, they constitute a better ecological choice when compared to commercial sodium silicate from melting process.

Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/ad0fc3804685bee6e46ca24858bfb260dd686260

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Citations in the corpus

• Use of Vietnamese rice husk ash for the production of sodium silicate as the activator for alkali-activated binders (2018, result): “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.,…”