Experimental Research on low temperature crack resistance of steel fiber asphalt concrete

How to improve the low temperature performance of asphalt mixture is crucial because low temperature cracking is one of the most common diseases of asphalt pavement. The steel fiber is a effective method in the ordinary asphalt mixture. The effect of steel fiber on the low temperature crack resistance of asphalt concrete is analyzed in cases of different temperatures and contents of steel fiber through the bending test of small beam. It is shown that the flexural tensile strength and the failure strain of the asphalt concrete decreased linearly with the decrease of temperature. Added steel fiber content immensely changed the size of flexural tensile strength(maximum rose to 31.8%). With the increasing of steel fiber content, the flexural tensile strength increases the amplitude showd o rising trend. It is suggested that improved flexural tensile strength and anti-deformability of asphalt concrete after adding steel fiber effectively increase anti-crackingability under low temperature.