Abstract This paper presents an investigation on the workability and mechanical properties of ambient-cured fly ash geopolymer concrete (GPC) containing four different fibres, namely steel (S), polyvinyl alcohol (PVA), polypropylene… Click to show full abstract
Abstract This paper presents an investigation on the workability and mechanical properties of ambient-cured fly ash geopolymer concrete (GPC) containing four different fibres, namely steel (S), polyvinyl alcohol (PVA), polypropylene (PP) and recycled polypropylene (RPP) fibres at 1% volume of concrete. The influences of hybrid S-PVA, S-PP and S-RPP on GPC at 0.5% of each type of fibre were also studied. In the mono fibre reinforced GPC (FRGPC) series, steel fibre showed the most effective role in improving the mechanical properties which were 4.0% in compressive strength, 74.3% in splitting tensile strength and 65.3% in flexural strength. In the hybrid FRGPC series, mixing of steel and RPP fibres was found more effective than the other combinations. The improvements by S-RPP were 15.5% in compressive strength, 48.9% in splitting tensile strength and 60.0% in flexural strength. The highest toughness was achieved for the S-RPP hybrid fibres following by mono steel fibres. A net deflection equal to 1/75 of the span could be regarded as the end deflection point to calculate the total flexural toughness of FRGPC according to quantitative analysis of toughness enhancement. There is a strong positive correlation between the total toughness and stress at the limit of proportionality (LOP) point.
               
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