飞灰替代矿粉沥青胶浆及混合料的性能研究

Study on the performance of fly ash instead of mineral powder asphalt slurry and mixture

将垃圾焚烧后得到的废弃物飞灰用于沥青道路工程中,可促进资源的合理化利用及绿色交通的发展。为研究飞灰沥青胶浆及混合料的性能,将飞灰掺加至基质沥青中,分别制备不同粉胶比、飞灰掺量的沥青胶浆,研究其流变性能,并验证混合料的路用性能。试验结果表明:飞灰能提升沥青胶浆的高温性能,但对低温性能影响不明显。飞灰显著提升沥青混合料的抗永久变形性能,但影响其低温抗裂性,降低水稳定性,试验结果均满足规范要求。沥青流变性能和混合料路用性能试验验证了飞灰部分替代矿粉的可行性,建议飞灰替代掺量为25%~50%。

The waste fly ash from waste incineration has been used in asphalt road projects,promoting the utilization of resources and the development of green transportation.In this study,in order to study the performance of fly ash asphalt binder and mixture,the fly ash was added to the asphalt,the asphalt binder with different powder-to-binder ratios(F/A)and fly ash content was prepared to investigate the rheological performance of asphalt binder.Moreover,the road performance of the mixture was verified.The results showed that the high-temperature behavior of asphalt binder can be improved by the fly ash,however,which has no significant effect on the low-temperature rheological properties of asphalt mortar.Furthermore,the permanent deformation resistance of asphalt mixture can be improved.However,the low-temperature crack resistance will be affected.and the water stability will be reduced,the test results still meet the specification requirements.The feasibility of partially replacing of mineral powder by the fly ash is verified the rheological behavior of asphalt and mixture pavement performance tests.The recommended replacement amount of fly ash is about 25%~50%of mineral powder.