Effect of Fly ash, Silica fume, Glass Fiber and Polypropylene Fiber on Strength Properties of Composite Fiber Reinforced High Performance Concrete

摘要

Pozzolanic materials Fly ash (FA) and Silica fume (SF), finer than cement, are emerging in the production of concrete proven to individually enhance the concrete properties. This investigation utilizes the combined effect of FA and SF as replacement of cement partially. Glass fibers (GF) and Polypropylene fibers (PPF) are used as an addition to produce CompositeFiber Reinforced HighPerformance Concrete (CFRHPC), and it was proposed to investigate its mechanical properties. The water to binder ratios (W/B) of 0.275, 0.300, 0.325, and 0.350, with an aggregate to binder ratio (A/B) of 1.75, were adopted. FA and SF were replaced in the range from 0% to 15% each, GF were added in volume percentages from 0% to 1%, and PPF were kept constant at 0.25%. The combined effect of FA and SF at 5% each as replacement of cement and composite fiber dosage of GF=1% and PPF=0.25% for W/B of 0.275 was found to be an optimum combination to obtain maximum strength properties for CFRHPC. A relationship in the form of mathematical models between cube compressive strength with cylindrical compressive strength, split tensile strength, and flexural strength of FA and SF based CFRHPC was also derived from this investigation's experimental results.