Experimental study on dynamic properties of asphalt concrete core material

To study the dynamic properties of asphalt concrete core materials, a series of dynamic triaxial experiments are conducted under different cell pressures, temperatures and consolidation ratios. The results show that dynamic elastic modulus is less affected by the extent of dynamic strain under the same experimental conditions. The stress-strain backbone curve can be described by a straight line through the origin, the slope of which is regard as the elastic modulus. The formula E_d=kp_a(σ_m/p_a)ⁿpresents the relationship of elastic modulus and mean sustained stress under the same temperature and stress ratio. Due to the rheological properties of asphalt concrete core materials, the elastic modulus decreases and the damping ratio increases with the rising of the temperature.