Abstract
In this study, compressive strength, density, porosity, and methylene blue adsorptive intensity of sodium aluminosilicate monolith produced from coal fly ash (CFA), ceramic tile waste (CTW), and spent bleaching earth (SBE) were evaluated. Using simple lattice mixture design, CFA-CTW-SBE blend with mass ratio of 55.95% CFA, 38.73% CTW, and 5.31% SBE, and an alkali solution containing 80% 8M NaOH and 20% sodium silicate, resulted to a maximum desirability of 12.4MPa compressive strength, 1310 kg/m3 density, 17.03% porosity, and 1.63% methylene blue adsorption intensity. The properties of the product conform to the specifications of ASTM C90-14 for lightweight load-bearing concrete.
Highlights
Geopolymerization is an innovative technology that can utilize raw materials rich in alumina and silica to produce new materials characterized by threedimensional polymeric structures called geopolymers
coal fly ash (CFA) is classified as Class F fly ash under ASTM C618-05 since the sum of the silica, alumina, and iron oxide is 72.82%, which is greater than 70%
ceramic tile wastes (CTW) and spent bleaching earth (SBE) have Si:Al ratio of 3.79:1 and 6.17:1, respectively, which means it can be used as adhesives in various industries operating at 200 to 600°C (Dimas et al, 2009; Timakul et al, 2015)
Summary
Geopolymerization is an innovative technology that can utilize raw materials rich in alumina and silica to produce new materials characterized by threedimensional polymeric structures called geopolymers. In addition to the issue of increasing need for landfill area, coal ash disposal poses the threat of the contamination of surface waters and groundwater from its heavy metal and mineral contents and poses harmful effects on the residents living near the power plant (Kalaw et al, 2018; Ho and Orbecido, 2018). Another raw material used is SBE which is a solid waste generated in vegetable oil industry. To assess its suitability as adsorbents for wastewater treatment, the optimum ternary mix geopolymer obtained were used for adsorption of methylene blue and its mechanism were fitted using Langmuir and Freundlich isotherm models
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