Behaviour of Ternary Blended Concrete Containing fly ash and Perlite Powder

The global demand for blended cement has been steadily increasing due to growing environmental concerns, technical advancements, and economic benefits. This study investigates the behavior of ternary blended concrete in which cement is partially replaced by fly ash and perlite powder. Perlite powder, a naturally occurring volcanic glass that expands when heated, is lightweight, highly porous, and exhibits excellent thermal and acoustic insulation properties. Its pozzolanic nature allows it to function as a supplementary cementitious material, enhancing concrete performance while reducing its overall density. When used alongside fly ash—a material known for improving long-term strength, durability, and workability—the ternary blend demonstrates a synergistic effect, achieving improved sustainability and mechanical balance. Experimental tests such as slump cone, compressive strength, split tensile strength, and density measurements were conducted to evaluate the fresh and hardened properties of the mixes. The results are compared with conventional concrete to assess the influence of these replacements on strength, workability, and weight reduction. The study ultimately aims to develop an optimized ternary mix that maintains sufficient mechanical strength while being lighter, more thermally efficient, and environmentally sustainable through reduced cement consumption and CO₂ emissions.