基于大样本的沥青与粗集料原料对混合料水稳定性的影响分析

Effects of Asphalt and Aggregates on Water Stability Performance of Asphalt Mixture Using Large Samples Analysis

沥青与粗集料的种类与质量是决定沥青路面质量的关键因素,为定量表征不同沥青型号、生产厂家、粗集料性质等对沥青混合料水稳定性的影响,分析相同种类、不同产地沥青混合料水稳定性差异的显著性水平。本研究基于大样本的沥青混合料生产配合比数据库,采用大数据分析方法,定量研究沥青与集料各参数差异对混合料水稳定性的影响程度。首先通过秩和检验法分析了不同沥青与粗集料种类组合之间水稳定性指标的差异性,然后通过广义因素方差分析法研究了不同厂家相同型号沥青混合料水稳定性的差异水平。研究表明,对于各种混合料的水稳定性:玄武岩与石灰岩性能相当;改性沥青优于普通沥青;标准沥青混合料(SUP)优于基质沥青(AC);公称粒径越小水稳定性越好;沥青生产厂家对沥青混合料的水稳定性影响不显著。基于大样本的分析方法适用于沥青混合料水稳定性分析,沥青标号、最大公称粒径及级配对混合料的浸水残留稳定比(MS0)的影响显著性高于对其冻融劈裂强度比(TSR)的影响显著性。

The type and quality of asphalt and coarse aggregate are the key factors determining the quality of asphalt pavement. In order to quantitatively characterize the influence of different asphalt models,manufacturers and coarse aggregate properties on the stability of asphalt mixture water,the significance level of the difference in the water stability of asphalt mixture between the same type and different places of origin is analyzed. Methods based on a large sample of asphalt mixture production proportion database,this work adopts the big data analysis method to quantitatively study the influence of different asphalt and aggregate parameters on the water stability of the mixture. Firstly,the difference of water stability index between different asphalt and coarse aggregate combinations was analyzed by rank-sum test,and then the difference level of water stability of the same asphalt mixture of different manufacturers was studied by generalized factor variance analysis. The results showed that,for the water stability of various mixtures,(a)basalt and limestone have demonstrated similar performance,(b) modified asphalt is superior to matrix asphalt,(c) SUP is superior to AC,(d) the smaller the nominal particle size,the better the water stability,(e) asphalt manufacturers have no significant influence on the water stability of asphalt mixtures. The analysis method based on large samples is applicable to the analysis of water stability of asphalt mixture. The influence of asphalt penetration grade,nominal maximum particle size and graduation,on MS 0 are obviously more significant than those of TSR .