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 hightemperature 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.