EFFECT OF NAOH MOLARITY ON THE MECHANICAL PROPERTIES OF CORN COB ASH-BASED GEOPOLYMER MORTAR USING LOCALLY AVAILABLE FINE AGGREGATES, A REVIEW

Abstract

Purpose: To review CCA-based geopolymer mortars critically and investigate the influence of NaOH molarity on mechanical and durability properties with respect to potential applications in sustainable construction in developing countries like Pakistan.

Design/methodology/approach: Comprehensive literature review with focus on the pozzolanic activity of CCA, activation mechanism with NaOH alkalis, and impact of 8–16 M NaOH solution on physical, mechanical, and durability properties.

Findings: Optimal NaOH molarity is 10–12 M, but the number of systematic investigations with 100% CCA-based binder systems is limited. Most significant research gap – no studies investigating the use of locally available fine aggregates, which is important for Pakistan.

Research limitations/implications: Not enough systematic research on optimization of molarity and fine aggregate characterization, durability assessment, and life cycle assessment.

Practical implications: Theoretical groundwork for development of environmentally friendly and locally feasible construction materials based on agricultural waste.

Originality/value: Systematic review of NaOH molarity effects on geopolymer properties derived from CCA with special focus on the neglected aspect of locally available fine aggregates.