Feasibility Study on Replacing Natural Aggregates with Recycled Aggregates and Stone Dust in M30 Grade Green Concrete

This study examines the mechanical and durability performance of M30 grade concrete incorporating multiple industrial and construction waste materials as partial substitutes for conventional constituents. Natural fine aggregate was replaced with 50% waste foundry sand (WFS) across all mixes, while additional replacements included manufactured sand (10–50%), waste brickbats (10–40%), recycled concrete aggregates (10–40%), and waste latex paint (5–25%) as partial substitute for mixing water. To enhance post-cracking behavior and strength characteristics, glass fibers and steel fibers were introduced in varying proportions. Comprehensive tests—including slump, compressive strength, split tensile strength, and flexural strength—were conducted to evaluate fresh and hardened concrete properties. Results indicate that selective incorporation of waste materials, either individually or in combination, yields significant improvements in strength and durability when compared with the control mix. The combined use of WFS with other waste constituents, along with fiber reinforcement, demonstrates effective particle packing, enhanced bonding, and reduced permeability. These outcomes validate the potential of utilizing industrial and construction wastes as sustainable alternatives in concrete production, promoting resource conservation and minimizing environmental impacts.