Optimization of hybrid fibre reinforced geopolymer concrete using hardened and durability properties
Kadarkarai Arunkumar1, Arunachalam Sureshkumar2, Arunasankar Chithambar Ganesh2, Loganathan Parthiban2, Premkumar V2
1Department of Civil Engineering, Mangalam College of Engineering, Ettumanoor, Kerala, India
2Department of Civil Engineering, Sree Vidyanikethan Engineering College, Tirupati, India
Geopolymer concrete is the finest replacement to ordinary portland cement concrete, reducing greenhouse gas emissions in cement production. Most of the binders used in geopolymer concrete require high alkaline solution, high-temperature curing, and a prolonged time for setting. In this study, wood ash, which has an alkaline compound in its composition, is used to replace fly ash. The binder ratio is fixed as 70 percent of fly ash and 30 percent of wood ash. Meanwhile, geopolymer concrete lacks brittleness, energy absorption, and impact strength. The addition of fibres is helped in improving the above-mentioned properties. This study has made an effort to incorporate waste rubber as fibre combined with polypropylene fibre. The various dosage of polypropylene and rubber fibre hybridization such as 0/1, 0.75/0.25, 0.5/0.5, 0.25/0.75, 1/0, and 1/1 is optimized. The impact of various fibre dosages on fresh and hardened characteristics of geopolymer concrete is assessed. Further, the impact of various hybrid fibre dosages on durability was also investigated in this study. As a result, the hybrid fibre dosage of 0.5 percent of PP and 0.5 percent of rubber attained significant performance in all hardened properties. The optimum mix also showed better resistance against all durability properties. The mix with 0.5PP/0.5R gained the maximum compressive strength of 47.30Mpa, which is sufficient to design the paver block for medium traffic conditions as per IS15658-2006.
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