Optimizing mechanical properties of concrete using sugarcane bagasse ash
S. Sankeeth, A.A.N. Prabhath, H.G.H. Damruwan, H.M.S.T. Herath, H.V.V. Priyadarshana, Sunil Kumara, CS Lewangamage, Kaveenga Rasika Koswattage
Abstract
Sugarcane bagasse ash (SCBA), a byproduct of the sugar industry in Sri Lanka, was assessed as a partial replacement for Ordinary Portland Cement (OPC) in concrete to address environmental concerns and waste management. The study aimed to determine if substituting OPC with SCBA would affect the mechanical and durability properties of concrete. SCBA was partially substituted at 5%, 10%, 15% and 20% by weight of cement for a target mean strength of 25 MPa and tested for workability, compressive strength, tensile strength, bond strength, ultrasonic pulse velocity (UPV), water absorption and rapid chloride permeability test (RCPT). Results showed that up to 10% SCBA improved strength and durability at 28 days, while 15% SCBA led to further gains at 90 days. The study concludes that SCBA can be recommended as a supplementary cementitious material, with 15% replacement offering optimal long-term performance for concrete with a target mean strength of 25 MPa. Key findings highlight that SCBA enhances both early-age and long-term mechanical properties and durability, supporting its use for sustainable concrete production in Sri Lanka.