The Effect of Different Crumb Rubber Loading on the Properties of Fly Ash-Based Geopolymer Concrete

Abstract This study aims at viability study the effects of addition of crumb rubber loading in fly ash-based geopolymer concrete for its properties. Crumb rubber is the recycled rubber from automotive scrap tires which can reduce scrap into uniform granules shapes that can absorb stress that reduces the reflective cracking because of its elastic properties. Geopolymer concrete includes an alternate material i.e Fly ash in replacement of cement, as a binding material. Mortar cubes of size 50mm x 50mm x 50mm were casted and curing at room temperature. X-Ray Fluorescence (XRF) and Scanning Electron Microscopy (SEM) were used to analyze the chemical composition of fly ash and the microstructure of the concrete. Moreover, compressive strength, water absorption capacity, and density of concrete are interrelated. Compression test, water absorption capacity test and density test were performed in hardened state, for different proportions of replacing the aggregate with crumb rubber i.e. 5%, 10%, 15%, 20%. Compressive strength test was performed at 7, 14 and 28 days. Results were obtained and compared. Decrease in strength was observed at 7, 14 and 28 days.