INVESTIGATION ON THE COMPRESSIVE STRENGTH PROPERTY OF RUBBERIZED GGBFS GEOPOLYMER CONCRETE
Abstract
This study examines the compressive strength development of rubberized ground granulated blast furnace slag (GGBFS) geopolymer concrete (GPC). Varying proportions of rubber crumbs were used as partial aggregate replacements, with alkaline activators comprising sodium silicate (silica-to-sodium oxide ratio of 3:1) and 4M sodium hydroxide to aid geopolymerization. A two-part geopolymer method was adopted, and mix design was guided by prior studies due to the absence of standardized GPC codes. Chemical analyses of slag and rubber crumbs were conducted. Following BS 1881: Part 118, cube samples of 100mm³ were molded and then oven-cured (25°C–60°C) for 7, 14, and 28 days. Compressive strength tests showed a decline in strength with increased rubber content, though optimized mixes maintained structural integrity. At 7 and 28 days, 3% rubber mixes recorded the highest strengths (0.157 MPa and 0.156 MPa respectively). However, unrubberized GPC displayed lower strength than OPC (~20 MPa), attributed to aluminosilicate limitations. FTIR analysis revealed weakly bonded phases like Clinochlore and Marialite, indicating a lack of essential Si?? and Al³? ions. The findings demonstrate the potential of recycled steel slag and rubber in sustainable construction, despite strength-related challenges.
Keywords: Geopolymer, Slag, Tyre, Compressive strength, Construction.
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