Analysis of Factors Affecting High-temperature Stability of Asphalt Mixture Based on Grey Relation Entropy

Grey relation entropy method was utilized to analyze the influence dgree of factors affecting high-temperature stability of asphalt mixture, and the influences of pressure and air void (compaction degree) were researched further. The results indicated that: 1) the sequence of influnece dgree (from important to unimportant) is pressure → temperature→air void→passing percentage of 4.75mm sized aggregate → filler-asphalt ratio → asphalt content → nominal maximum size of aggregate; 2) deficient compaction and heavy load lower the rut-resistance of asphalt pavement, and the influence of pressure is more conspicuous when compaction degree further reduces; 3) the high-temperature stability is overrated by dynamic stability of asphalt mixture with 100% compaction degree in laboratory.