为了研究高模量沥青及其混合料的低温抗裂性能，提出高模量沥青混合料低温抗裂性和抗疲劳性能的改善措施，采用低温弯曲、约束试件温度应力和三分点加载疲劳试验从不同角度揭示了3类技术途径的高模量沥青混合料低温抗裂性和抗疲劳开裂性能，通过抗裂性能试验分析了木质素纤维、玄武岩纤维、橡胶粉、SBR、硅藻土5种添加剂对高模量沥青混合料抗裂性能的改善作用。试验结果表明，采用低标号沥青、BRA 岩沥青和添加高模量剂后沥青混凝土的低温抗裂性下降，掺加高模量剂和 BRA 可改善沥青混合料的抗疲劳开裂性能，低温抗裂性不足是制约高模量沥青混凝土大范围推广应用的主要技术瓶颈，掺加5种添加剂后高模量沥青混合料低温抗裂性能均有一定程度提高，抗疲劳性能显著增大，玄武岩和木质素纤维对高模量沥青混合料低温性能和抗疲劳性能贡献最大，而橡胶改性沥青效果最差，经实体工程验证，建议优先选择矿物纤维来改善高高模量沥青混凝土的抗裂性能。%in order to study the low temperature crack resistance high modulus asphalt and its mix-ture,high modulus asphalt mixture is put forward to improve the performance of the low temperature crack resistance and fatigue resistance,low temperature bending,constraints,temperature stress and three point loading fatigue test specimens from different angles to reveal the three kinds of technological ways of high modulus asphalt mixture at low temperature crack resistance and the influence of the fatigue cracking re-sistance,through the analysis of the crack resistance test the lignin fibers,basalt fibers,rubber powder, SBR,diatomite,5 kinds of additives on the properties of high modulus asphalt mixture crack.Experimental results show that the low grade,BRA rock asphalt and asphalt adding high modulus agent after low tem-perature crack resistance of asphalt concrete,mixing higher modulus and BRA can improve the fatigue cracking resistance of asphalt mixture,the shortage of the low temperature crack resistance is high modu-lus asphalt concrete widespread popularization and application of main technical bottlenecks,adding high modulus asphalt mixture after five kinds of additives are to a certain extent to improve the low temperature crack resistance,fatigue resistance increases significantly,basalt and lignin fibers of high modulus asphalt mixture the largest contribution to the low temperature performance and fatigue resistance performance, and the effect of rubber modified asphalt,the worst advice preferred mineral fibre to improve anti-cracking performance of high modulus asphalt concrete.
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