Optimizing Geopolymer Concrete: Evaluating the Use of Sugarcane Bagasse-Ash and Carbon Fiber Reinforcement

Abstract

Geopolymer Concrete (GPC) has emerged as a viable alternative to traditional cement concrete due to its potential for reducing carbon emissions and promoting sustainability. This study explores the use-of sugarcane bagasse ash (SCBA), a by-product with pozzolanic properties and disposal challenges, in producing GPC. By varying the molar concentration of sodium-based alkali activators and maintaining a constant proportion of carbon fiber, the feasibility of partial replacement of cement by SCBA was examined. Strength tests were conducted at SCBA replacement levels of 5.00%, 10%, 15% & 20%, revealing that the concrete's compressive strength increased up to a 15% SCBA replacement, beyond which strength decreased. Notably, the concrete exhibited superior early strength with 15% SCBA, although later-age strength was influenced by ambient temperature variations. The study also assessed the impact of heat curing on the basic properties of GPC, comparing ambient-cured and heat-cured samples. Results indicated minimal strength variation due to heat curing. The research highlights the economic and environmental advantages of using SCBA over traditional Portland cement, given the latter's significant carbon footprint and resource consumption. Additionally, the investigation of carbon fiber reinforcement and its interaction with SCBA-based GPC offers insights into optimizing its mechanical properties and cost-effectiveness. This study underscores GPC’s potential as a sustainable construction material, contributing to reduced greenhouse gas emissions and efficient waste utilization.