生活垃圾焚烧炉渣沥青混合料的耐久性能

采用马歇尔试验方法设计掺加不同质量、不同粒径范围生活垃圾焚烧炉渣集料(BAA)的炉渣沥青混合料,分析BAA对马歇尔试验参数及路用性能的影响,并采用冻融循环劈裂试验、老化试验和疲劳试验研究混合料的耐久性能.研究表明:随着BAA质量分数增加,AC-20、SMA-13的设计沥青掺量、稳定度及流值提高,高温稳定性降低,但水稳定性能与低温抗裂性能的变化规律则不同;BAA替代天然集料的质量分数分别为10%的AC-20和10%~15%的SMA-13经3次冻融循环后,其劈裂强度、冻融劈裂强度比均提高,但老化后冻融劈裂强度比降低幅度较高;AC-20中BAA替代天然集料的质量分数为20%、SMA-13中为5%~10%时可降低老化对低温抗裂性能的不利影响,混合料疲劳寿命较高.综合试验结果,AC-20、SMA-13中BAA替代天然集料的质量分数均宜在10%左右.

Durability of Asphalt Mixture Containing Municipal Solid Waste Incineration Bottom Ash Aggregate

Asphalt mixtures containing different dosages, different particle sizes of municipal solid waste incineration bottom ash aggregate (BAA) were designed by Marshall test method. The effect of BAA on Marshall test parameters and pavement performance was analyzed. Durability performance of asphalt mixture containing BAA was also investigated by freeze thaw cycles splitting test, aging test and fatigue test. The results show that as the dosage of BAA in AC20 and SMA13 increases, the designed asphalt content, Marshall stability and flow value increases, high temperature stability decreases, meanwhile water stability and anti crack performance at low temperature changes differently. Using BAA instead of 10% (by mass) natural aggregate for AC20, 10%~15% for SMA13 can both improve splitting strength after 3 freeze thaw cycles, tensile strength ration and its reduction after aging test. When the dosages of BAA in AC20 and SMA13 are respectively 20% and 5%~10%, the mixtures have better anti crack performance at low temperature after aging and longer fatigue life. Based on the test results, the recommended dosages of BAA in AC20 and SMA13 are both 10%.