SBS改性沥青混合料低温性能试验研究

Experimental Study on Low Temperature Properties of SBS Modified Asphalt Mixtures

为评价不同气候条件对新建SBS改性沥青路面低温性能的影响,通过实验室模拟高温炎热和降雨气候条件,采用-10℃沥青混合料弯曲试验作为评价方法,开展SBS改性沥青混合料低温性能试验研究。结果表明:高温保温和恒温水浴浸泡处理会损害SBS改性沥青混合料低温性能,抗弯拉强度和破坏应变均下降,且随着养护温度和浸泡时间的增加,损害程度出现增大的趋势。因此,首先对SBS改性沥青混合料经过实验室模拟夏季高温和降雨气候处理后再进行低温弯曲试验更符合路面实际服役条件,能够反映SBS改性沥青混合料真实低温性能。

In order to evaluate the effect of different climatic conditions on the low temperature properties of the new SBS modified asphalt pavement,by simulating high temperature condition and rainfall condition in laboratory,the low temperature properties of SBS modified asphalt mixtures were studied by using-10℃bending test of asphalt mixture.The results show that,sustained high temperature and water bath with constant temperature can damage the low temperature properties of SBS modified asphalt mixtures.The flexural tensile strength and failure strain decrease,and the damage degree tends to increase with the increasing maintenance temperature and water bath time.It can be seen that,carrying out the low temperature bending test on SBS modified asphalt mixtures after indoor climatic simulation can better meet the actual service situation of the pavement and reflect the real low temperature properties of SBS modified asphalt mixtures.