The crossover model in quadratic regression equation is proposed as the model for evaluating the relationship among rolling temperature, gradation, rejuvenator content, air voids, Marshall stability, immersed Marshall stability, freeze-thaw splitting strength and splitting strength. The influences of rolling temperature and mixture gradation on Marshall performance under 2% rejuvenator content are analyzed. The nonlinear model of the 3 factors and Marshall performance is obtained by regression. The influence degrees of the first 3 factors on the Marshall performance are analyzed by using orthogonal test method, fractal gradation design theory, range and variance method. The rolling temperature, gradation, rejuvenator content, asphalt content, construction technology and other factors affect the performance of hot in-place recycled asphalt mixture, among them, the first 3 factors are easy to affect regeneration due to large fluctuations during construction. The long-term observation shows that the phase change asphalt mixture possesses high reliability of phase change cyclicity and good cooling effect. K), the maximum indoor cooling range can reach 5в„ѓ, and the maximum outdoor cooling range is 6в„ѓ.(2)The maximum specific heat capacity of the phase change asphalt mixture with 5% phase change particle content reaches 1.35 J/(g Therefore, PEG/SiO 2 particles can play the role of heat storage and cooling, and can also enhance the rutting resistance of asphalt mortar at high temperature. The result shows that (1) The microporous structure on the surface of PEG/SiO 2 particles can absorb light components in asphalt, thus indirectly increasing the relative content of heavy components in asphalt, and absorbing part of heat due to solid-liquid phase transition in the test temperature range.

The specific heat capacity and the indoor and outdoor cooling effect of the asphalt mixture with 0%, 3% and 5% contents of phase change particles are studied.

Finally, the phase change heat storage asphalt mixtures are prepared by replacing 0.075, 0.15 and 0.3 mm aggregates in FAC-13 gradation with the equal volumes of composite shaped phase change particles.

The high temperature rutting resistance and temperature sensitivity of the asphalt mortar with different contents of phase change materials are tested and compared by dynamic shear rheometer and simulated heating test. In order to explore the influence of composite shaped phase change particles on the pavement performance and cooling performance of asphalt and asphalt mixture, the self-made PEG/SiO 2 composite shaped phase change particles are mixed into matrix asphalt to prepare phase change asphalt mortar. Besides, the interaction among different parameters should not be ignored in the analysis of the influence of different parameters on the shear resistance of asphalt mixture. Thus, asphalt type and compaction degree are the main parameters affecting the shear performance of asphalt mixture.

However, aggregate type, asphalt-aggregate ratio and design compaction work exhibit a significant influence on the shear performance only under certain conditions, while the influences of asphalt type and compaction degree are always significant. The ANOVA result shows that there are complex interactions among the 5 selected parameters. The result of grey relational analysis indicates that the order from big to small of the correlation degrees between different parameters and the shear performance is as follows:asphalt type, compaction degree, design compaction work, asphalt-aggregate ratio and aggregate type. The shear performance of these asphalt mixtures are measured by UPT, and the experiment result is analysed by grey relational analysis and analysis of variance (ANOVA). Choosing 3 aggregate types (diabase, basalt, sandstone), 2 asphalt types (base asphalt No.70, SBS modified asphalt), 4 asphalt-aggregate ratios (OAC-0.4,OAC,OAC+0.4,OAC+0.8), 3 design compaction work levels (gyration numbers of 75,100,125), and 4 compaction degrees (93%Gmm, 94.5%Gmm, 96%Gmm, 97.5%Gmm) for indoor experiment, 54 kinds of asphalt mixture with different combinations of the forgoing parameters are prepared. To evaluate the influences of the main influencing factors of the shear performance of asphalt mixture and their interaction on the shear performance of asphalt mixture, aggregate type, asphalt type,asphalt-aggregate ratio, design compaction work and compaction degree are researched.

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