Engineering and Microstructure Properties of Cellular Lightweight Mortar from Recycled Glass mixed with Alkali-activated Fly Ash
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Abstract
This research aimed to investigate the use of the ground recycled glass (RG), a by-product from glass bottle process and the coal fly ash (FA), a by-product of the electricity generation process through coal combustion. These materials were used to produce the cellular lightweight mortar from the ground glass waste mixed with alkali-activated FA. The effect of sodium hydroxide (NaOH) solution concentration of 1, 3, 5, and 7 M, liquid alkaline activator (L) content to FA ratio of 0.6, 0.7, and 0.8 with the air foam content (Ac) of 1, 3, and 5 % by weight of FA on 7 days cured age to the engineering and microstructure properties were evaluated. The lowest unit weight of the samples was observed with a NaOH concentration of 1 molar, with L/FA ratio of 0.8 and the Ac content were 5 % by weight of FA. In contrast, the maximum compressive strength of the samples was 23.8 MPa with NaOH concentration of 7 molars, L/FA ratio of 0.6 and the Ac content was 0 %. When compared to Thai Industrial Standards (TIS), the optimal ratio for C10-type lightweight blocks was a NaOH concentration of 1 molar, L/FA ratio of 0.6 and the Ac content were 3 % by weight of FA. Meanwhile, the optimal ratio for C12-type lightweight blocks was a NaOH concentration of 1 molar, L/FA ratio of 0.6 and the Ac content was 1 % by weight of FA. The microstructure analysis revealed that increasing the NaOH solution concentration and L/FA ratio resulted in higher production of calcium aluminosilicate hydrate (C-A-S-H) coexisting with the geopolymer gel (NASH). However, the geopolymerization products decreased with the air foam content increased. This is attributed to the foam acting as a surfactant and plasticizer coating the particle surfaces.
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