Zhao Xiaowen, Ge Dongdong, Wang Jiaqing, Wu Dianwen, Liu Jun
Hunan Provincial Communications Planning, Survey & Design Institute Co., Ltd., Changsha 410200, China.
National Engineering Laboratory of Highway Maintenance Technology, School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China.
Materials (Basel). 2022 Feb 14;15(4):1387. doi: 10.3390/ma15041387.
The aim of the research is to quantify the property of asphalt mortar and asphalt mixture containing municipal solid waste incineration (MSWI) fly ash. The potential of partially replacing mineral fillers with MSWI fly ash in asphalt mixture production was investigated. Five different MSWI fly ash replacement ratios, which include 0%, 25%, 50%, 75%, and 100%, were adopted to assess the influence of fly ash dosage, and the optimum fly ash replacement ratio was proposed. The rheological characteristics of asphalt mortar with MSWI fly ash were assessed with the dynamic shear rheometer (DSR) and bending beam rheometer (BBR). The high temperature properties of the mixture with MSWI fly ash were assessed with the Marshall stability test and the rutting test. The low temperature cracking property was determined with the indirect tensile strength test at low temperatures. The moisture stability property was identified with the immersed Marshall test and the freeze-thaw cycles conditioned indirect tensile strength test. Based on the test results, the addition of fly ash and mineral filler remarkably increased the ǀG*ǀ of the asphalt mortar. The δ of asphalt decreased as the dosage of fly ash and mineral filler increased. The addition of fly ash and mineral filler degraded the low temperature characteristics of the mortar. Fly ash improved the high temperature characteristics of the asphalt mixture. The asphalt mixture with MSWI fly ash was more susceptible to thermal cracking than the control sample. The addition of fly ash weakened the moisture stability of the asphalt mixture. In order to guarantee the low temperature characteristics and the moisture susceptibility of the asphalt mixture, the fly ash replacement ratio was recommended to be set around 25%. With proper mixture design and fly ash dosage, the asphalt mixture would have adequate performance, as well as reduced environmental impact.
该研究的目的是量化含有城市固体废弃物焚烧（MSWI）飞灰的沥青胶浆和沥青混合料的性能。研究了在沥青混合料生产中用MSWI飞灰部分替代矿物填料的潜力。采用了五种不同的MSWI飞灰替代率，分别为0%、25%、50%、75%和100%，以评估飞灰用量的影响，并提出了最佳飞灰替代率。使用动态剪切流变仪（DSR）和弯曲梁流变仪（BBR）评估了含MSWI飞灰的沥青胶浆的流变特性。用马歇尔稳定度试验和车辙试验评估了含MSWI飞灰的混合料的高温性能。通过低温间接拉伸强度试验确定低温抗裂性能。用浸水马歇尔试验和冻融循环条件下的间接拉伸强度试验确定水稳定性。基于试验结果，飞灰和矿物填料的加入显著提高了沥青胶浆的|G*|。随着飞灰和矿物填料用量的增加，沥青的δ降低。飞灰和矿物填料的加入降低了胶浆的低温特性。飞灰改善了沥青混合料的高温特性。含MSWI飞灰的沥青混合料比对照样品更容易发生热裂。飞灰的加入削弱了沥青混合料的水稳定性。为了保证沥青混合料的低温特性和水敏感性，建议将飞灰替代率设定在25%左右。通过适当的混合料设计和飞灰用量，沥青混合料将具有足够的性能，同时减少对环境的影响。
