Mechanical Performance of Glass Fibre Reinforced Concrete: Compressive, Split Tensile and Flexural Strength

Glass fibre reinforced concrete (GFRC) improves the tensile and impact behaviour of concrete by dispersing short glass fibres in the cementitious matrix. This paper presents an experimental study of M25 concrete with a water–cement ratio of 0.45 and a superplasticiser, containing glass fibre at dosages of 2%, 3% and 4%. For each dosage, three 150 mm cubes, three 100 × 200 mm cylinders and three 100 × 100 × 500 mm beams were cast and tested at 28 days for compressive, split tensile and flexural strength. The mean compressive strengths were 35.79, 37.51 and 37.43 N/mm², the split tensile strengths 3.53, 3.76 and 3.64 N/mm², and the flexural strengths 4.32, 4.76 and 4.56 N/mm² for 2%, 3% and 4% fibre, respectively. The 3% dosage gave the highest value in all three tests, improving on 2% by 4.8%, 6.6% and 10.0%, while raising the dosage to 4% brought no further gain. All mixes exceeded the target mean strength of 31.6 N/mm².