基于低温性能的橡胶颗粒环氧沥青混合料研究

为了分析橡胶颗粒对环氧沥青混合料低温性能的改善作用，在选择形状特征及硬度合适的橡胶颗粒的前提下，基于抗弯拉强度、最大弯拉应变、弯曲劲度模量、脆化点温度及应变能密度对不同橡胶颗粒体积掺量下的环氧沥青混合料的低温性能进行研究，并通过室内试验对不同橡胶颗粒体积掺量下的环氧沥青混合料的水稳定性及高温性能进行验证.结果表明：橡胶颗粒的细长扁平颗粒含量越小、邵尔A型硬度越大，橡胶颗粒环氧沥青混合料的压实效果及抗松散性越好；体积掺量合适的橡胶颗粒对环氧沥青混合料的抗弯拉强度、水稳定性及高温性能影响不大，但能显著提高其低温变形能力，降低其脆化点温度，改善其低温性能；在-15 ℃时，5%橡胶颗粒体积掺量下的环氧沥青混合料相对未掺加橡胶颗粒的环氧沥青混合料，应变能密度提高了108.0%.
In order to analyze the improvement effects of rubber particles on low temperature performance of epoxy asphalt mixture, the low temperature performance of the epoxy asphalt mixture with different rubber particles volume content was studied choosing the rubber particles with appropriate shape feature and hardness, based on the flexural strength, flexural strain, flexural stiffness modulus, temperature of brittle point and strain energy density. The moisture susceptibility and high temperature performance of epoxy asphalt mixture with different rubber particles volume content were then validated by laboratory tests. The results show that the less the flat and elongated particle contents of rubber particles are, the greater the Shore A hardness of rubber particles is, the better the compaction effect and raveling resistance of rubber particles epoxy asphalt mixture are. The influence of rubber particles on flexural strength, moisture susceptibility and high temperature performance of epoxy asphalt mixture is not significant. However, the rubber particles with appropriate content can significantly increase the low temperature deformability of epoxy asphalt mixture, which can reduce the temperature of brittle point for epoxy asphalt mixture, and improve the low temperature performance of epoxy asphalt mixture. Compared with the epoxy asphalt mixture without rubber particles, the strain energy density of the epoxy asphalt mixture with rubber particles volume content of 5% is increased to 108.0 % at -15 ℃.