EXPERIMENTAL STUDY ON RAISING STRENGTH AND TOUGHNESS OF CONCRETE BY MODIFIED COARSE POLYPROPYLENE-STEEL FIBERS

The effect of the modified coarse polypropylene fiber-steel fiber on concrete behavior was obtained.The steel fiber with a higher elastic modulus can enhance compressive strength,anti-initial cracking stress and bending strength of concrete;whereas the modified coarse polypro pylene fiber with a lower elastic modulus can improve tough ness and antistrain capacity of concrete.All the behaviors of concrete may be enhance by regulating the mix of the two fibers in concrete,which can make concrete have different behaviors,including anticrack,better bending toughness and fatigue resistance etc.