不同老化条件下粉煤灰沥青混合料路用性能评价  

Evaluation of Road Performance of Fly Ash Asphalt Mixture under Different Aging Conditions

作　　者：吕珩 LV Heng(Zhengzhou Highway Engineering Company,Zhengzhou 450000,China)

机构地区：[1]郑州市公路工程公司,郑州450000

出　　处：《粉煤灰综合利用》2025年第2期156-159,168,共5页Fly Ash Comprehensive Utilization

摘　　要：为了研究不同老化条件下粉煤灰对沥青混合料性能的影响,以粉煤灰部分替代矿粉制定了4个掺配比例,并设计了三种老化条件,采用70℃高温车辙试验、-10℃小梁弯曲试验以及浸水马歇尔试验与冻融劈裂试验,系统评价了不同粉煤灰-矿粉比例的沥青混合料路用性能。结果表明:掺入粉煤灰可改善沥青混合料的高温性能与水稳定性,存在最佳掺量区间,且不同性能最佳掺量区间存在差异;粉煤灰会对沥青混合料低温性能产生不利影响,且掺量越大影响越显著;老化程度越大,沥青混合料各路用性能均显著降低。采用粉煤灰进行沥青混合料性能改善时,粉煤灰掺量应结合各路用性能进行综合确定。研究成果为粉煤灰在沥青路面的应用提供参考。In order to study the influence of fly ash on the performance of asphalt mixture under different aging conditions,four blending ratios were formulated by partially replacing mineral powder with fly ash,and three aging conditions were designed.The high temperature rutting test at 70℃,the beam bending test at 10℃,the immersion Marshall test and the freeze-thaw splitting test were used to systematically evaluate the road performance of asphalt mixture with different fly ash-slag ratio.The results show that the high temperature performance and water stability of asphalt mixture can be improved by partially adding fly ash.There is an optimal dosage range,and there are differences in the optimal dosage range of different properties.Fly ash will have an adverse effect on the low temperature performance of asphalt mixture,and the greater the content,the more significant the effect.The greater the degree of aging,the road performance of asphalt mixture is significantly reduced.When using fly ash to improve the performance of asphalt mixture,the content of fly ash should be determined comprehensively according to the road performance.The research findings provide a reference for the application of fly ash in asphalt pavement.

关 键 词：道路工程 沥青混合料 粉煤灰 老化 路用性能 

分 类 号：U415[交通运输工程—道路与铁道工程]