火山灰SBS复合改性沥青混合料路用性能及改性机理研究

Study on volcanic ash and SBS Composite Modified Asphalt Mixture Road Performance and Modification Mechanism

研究火山灰作为填料型沥青改性剂的技术可行性,提出采用火山灰等量替代矿粉与SBS改性剂进行复配,并基于车辙、低温弯曲、冻融劈裂和三分点加载疲劳试验研究了火山灰SBS改性沥青混合料的综合路用性能,同时揭示了火山灰对SBS改性沥青混合料的改性机理。试验结果表明:火山灰等量替代矿粉后,SBS改性沥青混合料的高温稳定性提高幅度最大可达36%,混合料水稳定性和低温抗裂性显著提高,火山灰SBS复合改性沥青混合料各应力水平下的疲劳寿命均高于普通SBS改性沥青混合料,疲劳寿命的提高幅度达40%,用火山灰等量替代矿粉作为沥青混合料的改性剂是可行的。

To study The technical feasibility of the volcanic ash as the filler type asphalt modifier, Ash amount is proposed instead of mineraI powder with SBS modifier for modifier, And based on rutting, low temperature bending, freeze-thaw splitting and three point loading fatigue test to study the road performance of volcanic ash and SBS modified asphalt mixture, at the same time reveals the modification mechanism of volcanic ash on SBS modified asphalt mixture, results show that： after the volcanic ash amount instead of mineral powder, high temperature stability of SBS modified asphalt mixture increase up to 36%, the mixture water stability and low temperature crack resistance increased significantly, the volcanic ash SBS composite modified asphalt mixture fatigue life under different stress level are higher than common SBS modified asphalt mixture, the fatigue life of increase rate of 40% , ash equivalent substitute mineral powder was used as modifier of asphalt mixture is feasible.