橡胶粉细度对沥青及温拌沥青混合料性能影响研究
Study on the Influence of Rubber Powder Fineness on the Performance of Asphalt and Warm Mix Asphalt Mixture

由废旧轮胎磨成橡胶粉制备的改性沥青不仅能够显著提高沥青路面的路用性能，而且可以节约资源保护环境。为进一步分析橡胶粉细度对沥青及温拌沥青混合料性能的影响规律，基于室内试验分别研究了40目、60目、80目、混合目橡胶粉细度对沥青三大指标及混合料路用性能的影响。研究表明随橡胶粉细度的增大，改性沥青针入度和延度值逐渐增大，软化点逐渐减小；沥青混合料高温稳定性逐渐降低，低温抗裂性和水稳定性先增大后减小，由一定级配组成的混合目橡胶粉制备的改性沥青及混合料综合性能更稳定。分析了热拌沥青混合料及温拌沥青混合料的性能差异，研究表明采用温拌技术可以显著提高混合料的高温稳定性，混合料的低温抗裂性也有小幅度提升，而对于混合料的水稳定性则影响不明显。
The modified asphalt, which is made by grinding the waste tire into rubber powder, can not only improve the road performance of asphalt pavement, but also save resources and protect the environment. In order to further analyze the influence of rubber powder fineness on the performance of asphalt and warm mix asphalt mixture, the influence of rubber powder fineness of 40 mesh, 60 mesh, 80 mesh and mix mesh on the three major indexes of asphalt and the road performance of mixture was studied based on the indoor test. The results show that with the increase of the fineness of rubber powder, the penetration and ductility of modified asphalt increase gradually, and the softening point decreases gradually; the high-temperature stability of asphalt mixture decreases gradually, the low-temperature crack resistance and water stability increase first and then decrease, and the comprehensive performance of modified asphalt and mixture made of rubber powder with certain gradation is more stable. The performance difference between hot mix asphalt mixture and warm mix asphalt mixture is analyzed. The results show that warm mix technology can significantly improve the high-temperature stability of the mixture, the low-temp- erature crack resistance of the mixture is also slightly improved, but the influence on the water stability of the mixture is not obvious.