基于颗粒堆积理论的密级配乳化沥青混合料级配优化

Gradation Optimization of Dense Grading Cold Emulsified Asphalt Mixture Based on Particle Packing Theory

为改善密级配乳化沥青混合料压实情况以及服役期性能,优化级配结构,以利于排水和压密。基于颗粒堆积理论,探究主骨架颗粒及其干涉颗粒相对含量变化对间断密级配乳化沥青混合料压实情况以及性能的影响。采用单轴贯入强度试验、弯曲试验以及冻融劈裂试验评价其路用性能。研究表明:对于间断密级配乳化沥青混合料,通过适量增加主骨架颗粒并等量减少相应干涉颗粒,可以减弱内部干涉作用影响,利于形成排水通道,提高压实及养生过程中的排水能力,混合料更易压密且骨架结构也更加稳定,高温稳定性和低温抗裂性能在一定程度上得到改善。

In order to improve the compaction and service performance of the dense grading cold emulsified asphalt mixture,the dense graded aggregate structure is optimized to facilitate drainage and compaction.Based on the particle packing theory,this paper explores the influence of the relative content of the main skeleton particles and their interference particles on the compaction and performance of the intermittent dense grading asphalt emulsion mixture.The uniaxial penetration strength test,bending test and freeze-thaw cycle test are used to evaluate the road performance.The research shows that for the intermittent dense grading cold emulsified asphalt mixture,by increasing the main skeleton particles and reducing the corresponding interference particles in an appropriate amount,the influence of internal interference can be weakened,which is beneficial to form drainage channels,improve drainage capacity during compaction and health maintenance,and mix The material is more compact and the skeleton structure is more stable,and the high temperature stability and low temperature crack resistance are improved to some extent.