飞灰替代矿粉对沥青胶浆性能的影响

吴书君¹,唐军²,吴艳玲^3*

1.菏泽交通投资发展集团有限公司，山东 菏泽  274000; 2.山东省交通科学研究院，山东 济南  250031;

3.山东交通学院 交通土建工程学院，山东 济南  250357

摘要：为减少垃圾焚烧处理中飞灰对环境的污染，将飞灰应用于沥青道路工程中，研究掺入飞灰的沥青胶浆及沥青混合料的使用性能。通过常规试验、动态剪切试验、低温弯曲梁试验及疲劳试验研究飞灰替代矿粉后沥青胶浆的性能变化，及掺入添加剂硫和氢氧化钠对飞灰沥青胶浆性能的影响。研究结果表明：飞灰替代矿粉的质量比约为25%时，沥青胶浆的常规性能变化较明显；提高粉胶质量比、飞灰替换矿粉的质量比均能大幅提高沥青胶浆的高温流变性能，但低温流变性能降低；在中低温条件下，掺入飞灰后沥青胶浆的抗疲劳性能显著降低；掺入添加剂硫和氢氧化钠后飞灰沥青胶浆的高温流变性能降低，低温流变性能有所提高。因此，在沥青混合料中掺入一定量的飞灰，提高粉胶质量比，掺入适量添加剂后可提高沥青胶浆的路用性能。

关键词：道路工程；飞灰；沥青胶浆；流变性能；抗疲劳性能；矿粉

The influence of fly ash replacement of mineral powder onperformance of asphalt mortar

WU Shujun¹, TANG Jun², WU Yanling^3*

1. Heze Transportation Investment Development Group Co., Ltd., Heze 274000，China;

2. Shandong Transportation Institute, Jinan 250031, China;

3. School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan 250357, China

Abstract:In order to reduce the pollution caused by fly ash in refuse incineration, fly ash has been applied to asphalt road engineering.The performance changes of asphalt mortar after replacing mineral powder with fly ash, and the effect of adding additives S and NaOH on the performance of fly ash asphalt mortar are studied by routine test, dynamic shear test, low temperature bending beam test and fatigue test. The results show that the conventional performance of asphalt mortar changes most obviously when the replacement amount of fly ash is about 25%. The high temperature rheological properties of asphalt mortar can be greatly improved by increasing the ratio of powder to binder and the mass ratio of fly ash replacing mineral powder, but the low temperature rheological properties are decreased to a certain extent. At medium and low temperature, the anti-fatigue performance of asphalt mortar decreases significantly after fly ash is added. The high temperature rheological properties of fly ash asphalt mortar decrease and the low temperature rheological properties are improved after adding additives S and NaOH. The road performance of asphalt mortar can be improved by adding a certain amount of fly ash, improving the ratio of powder to binder, and adding a proper amount of additives.

Keywords:road engineering; fly ash; asphalt mortar; rheological property; anti-fatigue performance; mineral powder