加载模式对沥青混合料动态模量的影响

Effect of loading mode on asphalt mixture dynamic modulus

采用MTS810试验机,通过室内动态模量试验,系统分析了加载频率、荷载级位和加载作用间隙时间等加载模式对沥青混合料动态模量的影响.结果表明：加载频率和荷载级位对动态模量试验结果有较大的影响,荷载级位对动态模量的影响大于加载频率,无间隙加载模式和有间隙加载模式对动态模量的影响不大;沥青混合料室内动态模量试验宜采用无间隙的连续加载模式,加载频率和荷载级位分别为10Hz和0.7MPa;在加载频率为10Hz、荷载级位为0.7MPa和无间歇的连续加载模式条件下,沥青混合料动态模量值大约为2000～2700MPa.

To investigate the effect of loading mode on dynamic modulus and determine appropriate loading mode of asphalt mixture dynamic modulus test, the effects of loading frequency, load level and loading clearance time on asphalt mixture dynamic modulus were analyzed on MTSS10 testing machine. The results indicate that loading frequency and load level have significant effects on dynamic modulus test results, and load level has more influence on dynamic modulus than that of loading frequency. The loading modes with and without clearance time have little influence on dynamic modulus. Loading mode without clearance time should be used in asphalt mixture indoor dynamic modulus test with loading frequency and load level of 10 Hz and 0.7 MPa, respectively. Under the optimal conditions, the asphalt mixture dynamic modulus value is in the range from 2 000 MPa to 2 700 MPa.