Experimental Study on Road Performance of Cold Mix and Cold Laid Asphalt Mixture
[Purposes]In order to evaluate the road performance of cold mix asphalt mixture and form the design parameters in the process of pavement design,it is necessary to conduct the test study.[Methods]The road performance of cold laying asphalt mixture was systematically analyzed by using technical in-dexes such as high temperature rutting,Marshall stability,low temperature stability,cohesiveness,low temperature construction workability and water stability,and the related performance of hot mixing,cold mixing and RAP cold mixing cold laying mixture was compared.[Findings]The optimum emulsified as-phalt content was 5.5%,cement was added 1.5%,the dynamic stability was 936 times/mm,and the high temperature rutting resistance was good.The wet and dry strength ratio of submerged Marshall test was 78.7%,and the strength ratio of freeze-thaw splitting test was 82.5%and low temperature and water sta-bility is relatively stable.[Conclusions]Compared with 30%RAP material cold mix and cold laid asphalt mixture,the high temperature stability of hot mix asphalt mixture>cold mix and cold laid asphalt mix-ture>cold mix and cold laid asphalt mixture with RAP material.Cold mix and cold laid asphalt mixture with RAP material can meet the requirements of the specification at low temperature and water stability.
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