AC-16沥青混合料高温稳定性试验

Experiment on high-temperature stability of AC-16 asphalt mixture

基于大量车辙试验结果,分析了沥青用量、碾压次数、抗车辙剂掺量及级配对AC-16沥青混合料高温稳定性的影响,并将AC-16抗车辙剂沥青混合料与普通沥青混合料(未掺抗车辙剂)的高温稳定性进行了对比分析。结果表明:车辙试验最佳沥青用量比马歇尔试验少0.2%～0.3%;压实功过大或过小均可使沥青混合料的高温稳定性降低,施工中应严格控制碾压遍数;AC-16沥青混合料的最佳抗车辙剂掺量为0.4%～0.5%;适当增加AC-16沥青混合料中粗集料含量,形成骨架密实型结构能够有效改善其高温稳定性;AC-16抗车辙剂沥青混合料的动稳定度比普通沥青混合料有很大提高,平均提高幅度为32.9%。

Based on the abundant rutting test results, the effects of asphalt contents, rolling times, contents of anti-rutting agent and different gradation compositions on the high-tempera- ture stability of AC-16 asphalt mixtures were analyzed. In addition, the comparative study was made to evaluate the high-temperature stability of AC-16 anti-rutting agent asphalt mixture and AC-16（without anti-rutting agent）. The results show that the optimal asphalt contents in rutting test are 0.2 % to 0.3 % lower than that in Marshall test; too much or too little compaction work can lead to the decrease of the high-temperature stability of asphalt mixture, so the rolling times should be strictly controlled in the construction process; the optimal contents of anti-rutting a- gent for AC-16 are from 0.4% to 0.5% ; appropriate increase in the content of the coarse aggre- gate could form the skeleton close-grained structure which could effectively improve the high tem-perature stability of the AC-16 asphalt mixturel dynamic stability average value of AC-16 anti- rutting agent asphalt mixture is 32.9 % higher than that of the ordinary asphalt mixture. 6 tabs, 3 figs, 10 refs.