Effect of fibres on the strength and behaviour of GPC columns

摘要

Geopolymers are alternative binders to ordinary Portland cement binder, and in geopolymer concrete (GPC) geopolymer gel is used as a binder. In the present study, the effect of steel fibres on the strength and behaviour of GPC columns under monotonic axial compression is studied. In total, 30 GPC columns with l/d ratios of 6 and 9 were cast and tested. The main variables considered in this study include different values of volume fraction of fibres such as 0.25% (19.62 kg/m(3)), 0.5% ( 39.24 kg/m(3)), 0.75% (58.86 kg/m(3)) and 1% (78.48 kg/m(3)) for each l/d ratio. Experimental results reveal that the addition of steel fibres slightly improves the axial strength and significantly improves the stress-strain behaviour of columns. A theoretical model for the stress-strain behaviour is proposed, and this model predicts the response of plain and fibre-reinforced GPC columns satisfactorily.