Strength and Acid Resistance of Mortar with Different Binders from Palm Oil Fuel Ash, Slag, and Calcium Carbide Residue

This study deals with the use of ground palm oil fuel ash (GPOFA) in combination with ground granulated blast furnace slag (GGBFS) and ground calcium carbide residue (GCR) to produce the binary and ternary binders-based alkali activated mortar. The appropriate content of materials in each binder type was determined as a function of compressive strength. The results revealed that both GPOFA:GGBFS and GPOFA:GCR binders had an optimum blending ratio of ۷۰:۳۰ wt%, while the GPOFA:GGBFS:GCR binder was ۵۵:۳۰:۱۵ wt%. An alkaline catalyst of NaOH was admixed to the best mixture in each binder type to stimulate the mortar's compressive strength. The sulfuric acid (H۲SO۴) resistance of the mortar in terms of weight change was also examined. The addition of ۱M NaOH in both binary and ternary binders could enhance the compressive strength and H۲SO۴ resistance of the mortar. The highest compressive strength and lowest weight change due to soaking in H۲SO۴ solution were found in the ternary binder mortar with a ۱ M NaOH. The mortar with GCR immersed in H۲SO۴ solution resulted in an increased weight, which was different from that of the mortar without GCR. The microstructural analysis of the alkali-activated pastes indicated more reaction products than in the case of the pastes without alkali activator. However, a higher concentration of ۲ M NaOH resulted in a poor microstructure, which had a negative effect on the compressive strength and H۲SO۴resistance. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۴-۰۱۰-۰۷-۰۸ Full Text: PDF

Keywords:

Calcium Carbide Residue , Granulated Blast Furnace Slag , Palm Oil Fuel Ash , Alkali Activated Mortar , Sulfuric Acid Resistance.