Experimental Study on Development of Concrete Using Glass Fibre

Abstract

In the present experimental investigation, attempts are made to study on the various strength properties like compressive strength, split tensile strength, an also durability properties like Acid and Sulphate attack on both ordinary concrete and Glass Fibre Concrete, using alkali-resistant glass fibres at stipulated ages. ISAT and CSAT test were held on long term durability properties of GFRC. Experiments were conducted for both Ordinary Concrete and Glass Fibre Concrete with different percentages of AR-Glass fibres. Studies were made on strength properties of Ordinary Concrete and Glass Fibre Concrete mixes. Studies were made on residual compressive strength, weight loss and pulse velocity of Ordinary Concrete and Glass Fibre Concrete mixes. Experimental test were also held on Glass Fibre Reinforced Concrete and ordinary concrete.

It was observed that as the addition of glass fibres to concrete mix increases, the workability of concrete mix was found to decrease as compared to control mix. At optimum dosage of GF the increase in compressive strength of glass fibre concrete mixes compared with control mix of concrete at 28 days compressive strength is observed from 18% to 20%. The percentage increase of split tensile strength of glass fibre concrete mixes compared with control mix at 28 days is observed from 15 to 20% for 0.2% glass fibres by weight of binder. The addition of glass fibres into the concrete mixture marginally improves the compressive strength at 28 days. It is observed from the experimental results and its analysis, that the compressive strength of concrete, splitting tensile strength of concrete increases with addition of low Percentage of glass fibers. The 0.2%, 0.45% and 0.7% addition of glass fibres into the concrete shows better result in mechanical properties and durability.

Addition of 0.2% glass fibres by weight of cement shows maximum increase in Compressive strength and Flexural strength varying 18% to 20%, and 15% to 20% respectively with respect to PC mix without fibres at 28 days of curing. The durability of concrete from the aspect of resistance to acid attack on concrete increases by adding AR-glass fibres in concrete .The glass fibres bridge across the cracks causing interconnecting voids to be minimum. UPV value found to be higher for concrete containing 0.45%GF by weight of cement. The value was 4.85 and 5.1 (km/sec.) at 56 and 90 days of curing respectively. The concrete mix containing 0.7%GF by weight of binder showed higher resistance against weight loss in H₂SO₄ solution i.e.0.69% compared with control mix of concrete without glass fibres.