Behaviour of Fly Ash and Silica Fume based Composite Fiber (Glass and Polypropylene) reinforced High-Performance Concrete under Acid Attack

Abstract

High-Performance-Concrete made with glass fibers and polypropylene fibers are regarded as Composite Fibre (Glass and polypropylene) Reinforced High-Performance Concrete (CFRHPC). The development of cost-effective state-of-the-art procedures for producing, evaluating, and designing with CFRHPC will enhance the performance for each performance characteristic and can be reliably achieved in the field. This investigation evaluates the effect of cement being partially replaced by combined fly ash and silica fume with glass fibers and polypropylene fibers as an addition to produce high-performance concrete with composite fiber for resistance to sulfuric acid attack for 30, 60, and 90 days. The water to binder ratios of 0.275, 0.300, 0.325, and 0.350 and an aggregate to binder ratio of 1.75 were adopted. Fly ash and silica fume were replaced in the range from 0% to 15% each, glass fibers were added in volume percentages from 0% to 1%, and polypropylene fibers were kept constant at 0.25%. The combined effect of fly ash and silica fume at 5% each as replacement of cement and the addition of composite fiber dosage of glass fiber = 1% and polypropylene fibers = 0.25% for water to binder ratio of 0.275 was found to be the optimum combination to obtain maximum acid attack resistance.