Evaluation of the engineering and physicochemical properties of a novel geopolymer binder from red mud, rice husk ash, and diatomaceous earth using sodium silicate solution as alkaline activator

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ID: 284872
2015
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Abstract
Geopolymers, also known as alkali-activated pozzolan cements, have been recently gaining attention as an alternative binder for concrete because of its potential to lower the environmental impact of construction, to utilize waste as raw materials of alumino-silicates, and to enhance the material performance. In this study, engineering properties of sodium silicate activated geopolymer-based material produced from the ternary blend of red mud (RM) waste, rice husk ash (RHA) and diatomaceous earth (DE) which was optimized with statistical design of experiment and multi-response surface method. Using the augmented simplex lattice mixture design, ten mix proportions of RM, RHA, and DE were prepared and mixed with 15%, 20%, 25%, and 30% (by weight of the solid) water glass solution (WGS) to produce the specimens. After 28 days of curing at room temperature, these specimens were tested for compressive strength (MPa), volumetric weight (kg/m3), thermal conductivity (W/m.K), water absorption (kg/m3), and thermal stability including the mass loss (%), volumetric shrinkage (%) and change in compressive strength (%) when subjected to an elevated temperature of 10000C. By using the desirability function approach on multiple responses, the optimum ternary blend was found in ranges of 14.47-17.07 % RM, 63.43-67.19% RHA, 17.23-21.66% DE mixed with 20-25% WGS to obtain the desirable engineering properties of sodium-silicate activated geopolymer-based material. The predicted engineering properties are in the range of 12-15 MPa for compressive strength, 1297-1307 kg/m3 for volumetric weight, 55-63% for heat resistance in terms of strength gain, 7-8% for volumetric shrinkage, 7.6-8.3% for mass loss, 190-206 kg/m3 for water absorption, and 0.29-0.32 W/m.K for thermal conductivity, respectively. Confirmatory experiments were also carried out an optimal mix (OM) formulation of 15% RM, 65% RHA and 20% DE with WGS concentration in the range of 10 to 30%. Confirmatory runs were also done and the experimental values were found to be in g The study also proposed the reaction mechanism for the formation of the amorphous alumino-silicate geopolymeric networks in the sodium silicate activated geopolymer from the ternary blend of RM, RHA, and DE based on the results provided by SEM-EDS, XRD, and FTIR. This proposed mechanism showed that the tetra-silicates or acid silicic (Si(OH)4 or H4SiO4) dissolved and reacted with the iron oxide (Fe2O3) in RM and DE to form the oligomer precursor (-Fe3+[SiO4]4--). Aside from the formation of precursor tetra-silicates or acid silicic (Si(OH)4 or H4SiO4) from the dissolution of SiO2 of raw materials (RHA and DE),
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Authors Nguyen, Hoc Thang
Journal Malay Journal
Year 2015
DOI
DOI not found
URL
https://animorepository.dlsu.edu.ph/etd_doctoral/434
Keywords Keywords not found

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