Neem Gum as a Green Concrete Additive: Optimizing Structural Integrity and Environmental Sustainability

This research explores the application of Azadirachta indica (neem) gum, a biopolymer, as a sustainable additive in cement-based composites. Evaluated across dosages of 0–1.6% (by cement weight), neem gum demonstrated dual functionality as a setting retardant and water-reducing agent. Experimental results revealed a 38% increase in slump (65 mm to 90 mm) and a 30% extension in final setting time (280 to 365 minutes), enhancing workability. While compressive strength showed marginal declines, flexural and split tensile strengths improved by 10% (8.55 N/mm²) and 12% (4.95 N/mm²), respectively, at 90 days. Durability assessments highlighted a 32% reduction in corrosion rates (0.055 mm/year) and superior chloride resistance, attributed to neem gum’s alkaloids and saponins. This study positions neem gum as a cost-effective, eco-conscious alternative to synthetic admixtures, particularly in corrosive environments.