Abstract
Effects of Al(OH)3 content on the compressive-strength of alkaline activated ground blast furnace slag (GBFS)-ultrafine palm oil fuel ash (UPOFA) based mortar (AAGU) were investigated. The mortar was activated with combined activators (Na2SiO3aq of silica modulus (Ms=SiO2/Na2O) of 3.3 and 10M NaOHaq). The Scanning Electron Microscope couple with energy dispersive X-ray (SEM+EDX) revealed the possibility of formation of distinctive products of calcium-silicate-hydrate (C-S-H) and Ca/Na-alumino-silicate-hydrate (C/N-A-S-H) while Fourier transform infra-red spectroscopy (FTIR) revealed the existence of higher degree of Si–Al substitution, amorphousity and carbonation as a result of inclusion of Al(OH)3 in the mixture. The 3-day compressive-strength of AAGUAl mortar increased with Al(OH)3 up to optimum value of 4wt.% of PMs (GBFS+UPOFA) but started decreasing when the Al(OH)3 is outside the optimum. The strength of 42–49.5MPa could be achieved at the Al(OH)3 dosage of 3–4wt.% while the equivalent SiO2/Al2O3 molar-ratio ranged from 6.72 to 8.94.
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