STUDY ON ELASTIC PROPERTY OF MIXED FIBER REINFORCED CONCRETE

SYNOPSIS The present experimental investigation is conducted to study the elastic behavior of mixed fibers of AR HD glass and mild steel with an aspect ratio of 857 and 55. Microsilica in percentages of 5 and 15 also has been employed as a partial replacement to cement. Glass fiber and steel fiber were mixed by volume percentage in different proportions of 0 100, 25 -75, 50 50, 75 25 and 100 0 in each of the total fiber percentages of 0.5, 0.75, 1.0 and 1.5. It is found from the test results that in a total fiber percent of 1.5 and with 15% microsilica, the MFRC specimens showed least strains and maximum values of direct modulus and initial secant modulus compared to specimens with 0% and 5% microsilica. Addition of glass fiber in certain percentage to steel fiber in the MFRC is resulting in substantial decrease in linear and lateral strains. From the fiber combinations, 100% steel fiber without glass fiber is giving the highest modulus. With other mixed combinations of glass and steel fibers like 75% 25%, 50% 50% and 25% 75%, the failure of the specimens is found to be smoother with better crack behavior though modulus is lower compared to 100% steel fiber.