Effects of S2 Glass Fiber on Strength Properties of Normal Strength Concrete

Abstract

This study investigates the effects of S-2 glass fiber (S2-GF) with various contents on strength properties of normal strength concrete. The cement used in this study is ordinary type 1 Portland cement. Four series of concrete mixtures with 0.00%, 0.35%, 0.70%, and 1.05% by the weight of cement of S2-GF were prepared. The mixtures were then tested at 7, 14, and 28 days for compressive, flexural, and split tensile strength according to ASTM standards. Tests results showed that all compressive, flexural, and split tensile strengths increase with an increased amount of S2-GF contents. For an increase of 0.00% to 1.05% of S2-GF, the strengths were increased as: The 28 days compressive strength was increased from 37.32 MPa to 41.89 MPa showing an 12.25% increase in strength, the 28 days split tensile strength was increased from 3.56 MPa to 5.43 MPa showing a 52.58% increase in the strength, and the 28 days flexural strength was increased from 4.68 MPa to 6.48 MPa showing a 38.50% increase in flexural strength. The test samples with increased amount of S2-GF tolerated increased amount of strains and showed relatively uniform crack distribution compared to the controlling test specimen. Addition of S2-GF resulted in relatively ductile failure of the test samples.