Optimization gradation of permeable asphalt mixture PAC-16
In order to improve the high-temperature performance of the permeable asphalt mixture,this study simulated three-axis shear test of PAC-16 mixes,built a numeric model of the virtual shear test,and verify its simulation accuracy.Based on this,the mineral gradation of PAC-16 was optimized in combination with simulation and interior trials.Results showed that the peak stress,internal friction angle and adhesion of different enclosure levels measured by the virtual test method were not more than 5%of the error of the actual test results,and the test rules are in line with the actuality.The recommended optimal dosage of coarse aggregate of 4.75-9.5 mm:9.5-13.2 mm:13.2-16 mm:16-19 mm is 10:15:12:3,the optimal grading of fine aggregate was taken as the gradation corresponding to i=0.75,and the ratio of coarse aggregates to fine aggregates was 80:20.The key sieve pass rates of 0.075 mm,4.75 mm,and 16 mm are determined and the optimized gradation of PAC-16 was proposed.It has been shown that the high-temperature performance of the optimized gradation was improved by at least 10%,and the overall road performances were even better.
permeable pavementpermeable asphalt mixturetriaxial testgradation optimizationhigh temperature performance
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