【摘要】 本文采用Ｊ－积分法研究了几种改性沥青的低温性能，试验结果表明，改性剂的加入，可以使沥青在低温下的韧性增强，使沥青的低温抗裂性能变好，并从断裂力学的观点出发，用银纹、剪切屈服和裂纹绞结对改性机理进行了探讨。另外本文还用Ｊ－积分对低温蠕变（１ＭＰａ，０℃）作以验证与评价。更多还原

【Abstract】 The paper stacly low-temperatere performance of a fewmodified agent with J-integral mwthod,the testing result indiecate to use modihied asphalt can increasc toughness and ynprove crack resistance of asphalt in low temperatare.Proceed from fracture mechanics,the modified mechanism .was-discussed,with shear ,yield and cracd joint.the paper verify and evaluate low temperature creep(1MPa,0℃)with J-infegral method.更多还原