橡胶粉掺量对高模量沥青及其混合料性能的影响

Influence of rubber powder content on characteristics of high modulus asphalt and its mixture

为改善高模量沥青混合料的性能缺陷，提出采用橡胶粉与高模量剂复配方案来改善其路用性能．通过DSR试验、BBR试验、MMLS3加速加载试验、低温弯曲试验、小梁弯曲疲劳试验分析4％～12％橡胶粉掺量对高模量沥青及其混合料技术性能的影响．试验结果表明：橡胶粉掺加超过8％后，高模量沥青的高温分级由82℃增加到88℃，低温分级由-12℃降低到-18℃；橡胶粉的加入可改善高模量沥青混合料的高温耐久性和低温抗裂性，且掺8％～10％橡胶粉后，高模量沥青混合料疲劳性能显著提高．

Adding rubber powder to high modulus asphalt mixture and high modulus agent complex scheme are proposed to improve the performance of high modulus asphalt mixture. A series tests, including DSR, BBR, MMLS3 accelerated loading test, low-temperature bending test and flexure fatigue test, were conducted on the high modulus asphalt mixture with rubber powder contents of 4%-12% to study its technical performance. The results show that： with more than rubber powder content of 8% in the high modulus asphalt mixture, its high temperature of high modulus drain grading increased from 82 ℃to 88℃, and low temperature grade decreased from -12 ℃to -18℃; the addition of rubber powder can also improve the durability of high modulus asphalt mixture of high temperature and low temperature crack resistance. Es- pecially when the rubber powder content is between 8% and 10%, the fatigue performance of high modulus asphalt mixture improved significantly. Therefore, it is recommended that 8%-10% rubber powder content as the best dosage for high modulus asphalt.