Study On Pavement Performance Of Different Structural Types Under Freeze-Thaw Cycles And Dry-Wet Cycles With Salt Action

Low temperature and snow cover often occur in winter in the northern seasonal frozen area,which seriously affects the safety and smoothness of roads.And the most common as well as the best way to deal with this situation is to sprinkle snow-melting salt on the road surface,but this will lead the road to long-term salt freezing-thawing and drying-wetting circulation,which will further endanger the healthy use of roads.In this thesis,taking AC-13 and SMA-13 rubber SBS composite modified asphalt mixture as the research object,the pavement performance changes of the two asphalt mixtures with different pavement structures under the action of salt freeze-thaw and drying-wetting cycles are compared and analyzed through the test data obtained at last,which may provide effective and practical guidance for practical road projects.The test results show that with the increasing concentration of salt solution from0%,4%,8%,12% to 16%,the dynamic stability,failure strain and splitting tensile strength ratio of asphalt mixtures of these two pavement structure types are continuously decreasing;The number of freeze-thaw cycles increased from 0 times,5times,10 times to 15 times,the dynamic stability,failure strain and splitting strength ratio of these two types of asphalt mixtures are gradually decreasing as well.By comparing and analyzing the pavement performance test data of the two pavement structure forms,it is found that SMA-13 rubber SBS composite modified asphalt mixture has more pavement performance advantages than AC-13 rubber SBS composite modified asphalt mixture in terms of high temperature stability,low temperature cracking resistance and water stability.