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Concrete being most widely used construction material across the world need to be sustainable. This study aims at feasibility study the effects of addition of PU rubber in geopolymer concrete for its strength. PU rubber is formed by polymerization process. A long and low crosslinking chain gives stretchy polymer and a short and high crosslinking chain gives hard polymer. High amounts of crosslinking give tough or rigid polymers. Geopolymer concrete includes an alternate material i.e Fly ash in replacement of cement, as a binding material . Fly ash reacts with the alkaline activated solution i.e mixture of Sodium Hydroxide (NaOH) and Sodium Silicate (Na2SiO3) forming a gel which binds the aggregates thoroughly. Cubes of size 150mm x 150mm x 150mm were casted and oven curing was done for 24 hour at 100°C. Compression test was performed in hardened state, for different proportions of replacing the aggregate with PU rubber i.e. 5%, 10%, 15%, 20%. Compressive strength test was performed at 7 & 28 days. Results were obtained and compared. Optimum mixes are Fly ash Coarse aggregate, Fine aggregate, Solution of NaOH and Na2SiO3 combined. Decrease in strength was observed at 7 & 28 days. Concrete being most widely used construction material across the world need to be sustainable. This study aims at feasibility study the effects of addition of PU rubber in geopolymer concrete for its strength. PU rubber is formed by polymerization process. A long and low crosslinking chain gives stretchy polymer and a short and high crosslinking chain gives hard polymer. High amounts of crosslinking give tough or rigid polymers. Geopolymer concrete includes an alternate material i.e Fly ash in replacement of cement, as a binding material . Fly ash reacts with the alkaline activated solution i.e mixture of Sodium Hydroxide (NaOH) and Sodium Silicate (Na2SiO3) forming a gel which binds the aggregates thoroughly. Cubes of size 150mm x 150mm x 150mm were casted and oven curing was done for 24 hour at 100°C. Compression test was performed in hardened state, for different proportions of replacing the aggregate with PU rubber i.e. 5%, 10%, 15%, 20%. Compressive strength test was performed at 7 & 28 days. Results were obtained and compared. Optimum mixes are Fly ash Coarse aggregate, Fine aggregate, Solution of NaOH and Na2SiO3 combined. Decrease in strength was observed at 7 & 28 days. Keywords— Geopolymer concrete, Fly ash, Polyurethane Rubber (PU), Compressive Strength, Optimum mix. Kalpa Publications in Civil Engineering Volume 1, 2017, Pages 285–290 ICRISET2017. International Conference on Research and Innovations in Science, Engineering &Technology. Selected papers in Civil Engineering C.D. Modhera, G.J. Joshi, D. Soni, I.N. Patel, A.K. Verma, L.B. Zala, S.D. Dhiman, D.R. Bhatt, J.M. Rathod, B.C. Goradiya, M.S. Holia and D.K. Patel (eds.), ICRISET2017 (Kalpa Publications in Civil Engineering, vol. 1), pp. 285–290

Feasibility of Utilization of Industrial Polyurethane (PU) Rubber Waste in Geopolymer Concrete.