EFFECTS OF GLASS FIBER AND POLYPROPYLENE FIBER ON THE PROPERTIES OF CONCRETE

ABSTRACT The main objective of this research is to study the effect of fibers on the mechanical properties of the concrete it includes toughness, compressive strength and flexural strength of the various concrete mixture proportions. The inclusion of glass fiber and polypropylene fiber impart the toughness to the concrete matrix. The high gain in strength was observed, the gain in strength also depends upon the compaction effort on the concrete. The percentage of glass fiber varies from 0% to 0.04% while the percentage of polypropylene from 0 to 0.45%. The test results showed the increase in compressive strength with respect to the reference mix, the maximum strength was found by the addition of 0.04% glass fiber and 0.3% polypropylene fiber. The maximum compressive strengths were 36.8 MPa at 3 days, 44.3 MPa at 7 days and 53.6 MPa at 28 days. The flexural strength also increases by increasing fiber content and the maximum flexural strength of 5.49 MPa at 7 days and 7.92 MPa at 28 days with 0.04% glass fiber and 0.45% polypropylene fiber