Influence of compacted casting on the mechanical and physical properties of geopolymer mortar utilizing sugarcane bagasse ash

This study examines factors influencing the performance and sustainability of geopolymer mortars, focusing on the impact of compacted casting techniques. The primary objective of this research is to evaluate the effects of compaction methods on the mechanical and physical properties of geopolymer mortar incorporating sugarcane bagasse ash (BA) and limestone dust (LSD). Using a compaction method, mortars were produced from bagasse ash (BA) partially replaced with limestone dust (LSD) in sand. Analysis revealed that BA has a rougher texture and less Aluminum (Al) compared to LSD, improving chemical composition and reducing internal voids, enhancing both performance and durability. Compressive strength tests showed samples cured at 100°C for 3 days achieved a peak strength of 47.60 MPa at an AL/B ratio of 0.80. At 28 days, compacted samples reached 22.60 MPa. Curing at 40°C significantly influenced compressive strength at both 3 and 28 days, with higher temperatures resulting in larger pores and affecting water permeability. Curing at 100°C led to higher early-age compressive strength, while curing at 40°C resulted in higher water permeability and lower compressive strength due to incomplete geopolymerization. Higher compressive strength at 100°C suggests enhanced geopolymerization, while larger pores at higher temperatures affect permeability. Lower temperatures result in incomplete geopolymerization, affecting both strength and permeability. An AL/B ratio of 0.80 is optimal for BA in geopolymer production, yielding maximum compressive strength. This study underscores the crucial role of curing temperatures and the AL/B ratio in enhancing the mechanical and physical properties of geopolymer mortars. It also highlights the innovative use of agricultural waste materials to develop new eco-friendly products with potential conversion into geopolymer bricks. This paves the way for sustainable construction and reduces environmental impact