Abstract
This paper presents the effects of Sago pith waste ash (SPWA) as a replacement material in fly ash (FA) based geopolymer mortar (from 0 to 40%), from the aspect of mineral composition and compressive strength. The geopolymers were prepared and synthesized using a combination of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) as activator whilst SPWA and FA (by percentage) as high silica-alumina resources. The compressive strength of geopolymer mortar utilizing SPWA/FA was investigated together with the quantitative chemical characteristic via X-ray fluorescence (XRF) and the X-ray diffractometer (XRD). It was observed that by substituting SPWA to partially replacing FA in geopolymer mortar affects the compressive strength as well as the chemical compositions of the mortars. SPWA can increase 5% of the compressive strength (at 10 wt% SPWA, GSPWA10) compared to the FA geopolymer based sample (control). Furthermore, the increment in the percentages of SPWA increased the silica/alumina (SiO2/Al2O3) ratio and that resulted in reduction of compressive strength for other geopolymer mortar samples.
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