On reducing greenhouse gas emissions by the cement industry, geopolymer with an amorphous polymer form was the best alternative.
Geopolymer concrete (GPC) was weak in impact strength, brittle, ductile, and energy absorption than conventional cement concrete.
Various property fibres with the capacity to improve the aforementioned properties of GPC can be added. Polypropylene fibre with
low elastic modulus and waste tire rubber fibre with high elastic modulus was used in this research to improve energy absorption and
impact strength. Different modulus fibres such as polypropylene and rubber was added by 0%, 0.5%, 1%, 1.5% and 2% of volume
fraction. The effects of adding individual fibres on the mechanical property of eco-friendly geopolymer concrete were studied. In
addition, the influence of hybrid fibres on the mechanical features of low-calcium geopolymer concrete was assessed. The research
results revealed that the hybridization of 0.5% of polypropylene fibre and 0.5% of rubber fibre showed better performance and achieved
maximum strength in all mechanical features such as compressive, flexural, and splitting tensile behaviour. Meanwhile, the optimum
hybrid fibres increased the mechanical features by 23.9%, 12.0%, and 15.2%, respectively, at the 28 days of curing ages compared to
geopolymer concrete without fibres.