纳米黏土与尼龙纤维复合改性沥青混合料力学性能研究

Study on the Mechanical Properties of Nano Clay and Nylon Fiber Composite Modified Asphalt Mixture

摘要:

将不同掺量的纳米黏土和尼龙纤维加入到沥青混合料中进行复合改性，通过马歇尔试验、弹性模量试验、动态蠕变试验、疲劳试验等进行力学性能对比与验证，以期提高沥青混合料综合力学性能。试验结果表明，0.4%尼龙纤维+6%纳米黏土复合改性沥青混合料的马歇尔稳定度、弹性模量和疲劳寿命相比于尼龙纤维或纳米黏土单一改性时可提升11.4%、9.1%和14%，但在抵抗永久变形方面，复合改性效果显著弱于6%纳米黏土单一改性效果。研究成果可为建设高性能沥青路面提供理论基础。

Abstract:

In the improvement of mechanical properties of asphalt mixtures, nanoclay and fibers exhibit excellent performance in reducing permanent deformation and resisting fatigue cracking, respectively. This study added nano clay and nylon fibers with different dosages to asphalt mixture for composite modification. The mechanical properties were compared and verified through Marshall test, elastic modulus test, dynamic creep test, fatigue test, etc., in order to improve the comprehensive mechanical properties of asphalt mixture. The experimental results show that the Marshall stability, elastic modulus, and fatigue life of 0.4% nylon fiber+6% nanoclay composite modified asphalt mixture can be improved by 11.4%, 9.1%, and 14% compared to nylon fiber or nanoclay single modification. However, in terms of resistance to permanent deformation, the composite modification effect is significantly weaker than the single modification of 6% nanoclay. The research results provide a theoretical basis for the construction of high-performance asphalt pavement.