Study On Phase Change Material For Asphalt Pavement Deicing Snow

In the cold winter,a lot of potential safety problems will happen under the conditi on of the the snowy and icy pavement,the commonly used methods of anticoagulant ro-ad ice exist great shortcomings:low efficiency and high costs of manual removal meth-od,high costs using the deicing salt removal method suffers more limitation and can t r-emove the snow and ice on time,and easily make damage on the environment and road.Phase change material may be using its phase transition of the heat absorbed or released to the heat storage or storage purposes.The phase change material used in asphalt pave-ment,pavement can automatically adjust the temperature,cooling rate decreases whenthe asphalt pavement cooling,delay or reduce the occurrence of extreme low temperat u-res and duration of remission asphalt road in winter with snow and ice problems.In this study we select n-dodecane and n-tetradecane as phase change materials,CNOOC 70#asphalt as the research object.Single phase change material can not fulfill the ice surface anticoagulant requirements on the phase transition temperature,so the two binary phase change materials of organic phase change materials,using two sub-stances can form the lowest eutectic with the nature,adjust the phase transformation temperature range.This paper focuses on a binary phase-change material for DSC test analysis,and the asphalt of the phase change substantially modified asphalt phase tran-sition properties,thermal properties,rheology,stability,and resistance test anticoagulant ice analysis,the binary phase variable materials optimum molar ratio,optimal dosage and modified bitumen anticoagulant ice phase transition temperature.By mix-ing n-dodecane and n-tetradecane,which composed of binary system phase change material?According to Schroeder,the formula to calculate n-dodecane and n-tetrade-cane five molar ratio,so as to do differential scanning calorimetry test respectively.Comprehensive comparison of the test results,the molar ratio of 7#mixture which is result of the n-dodecane and n-tetradecane molar ratio 1.03:1 as the best proportion of the molar ration of the mixtures.The endothermic temperature ranges from-15.5 ??1.2 ? doped with 7#mixture of different proportion of asphalt performance is ana-lyzed,with the increase of dosage of phase change materials,transformation of asphalt penetration becomes larger,softening point becomes lower,and ductility increases.Af-ter the phase change materials mixed with asphalt,the performance is stable,and inter-action does not occur with the asphalt.The incorporation of high-density polyethylene(HDPE M200056)and low density polyethylene(LDPE 8006)to improve the performance of phase-change asphalt,dif-ferent contents of modified phase change asphalt analyze basic performance indicators,viscosity and rheological properties.The test results show that with the increase of the dosage of modifier content,it reduces the penetration of asphalt and softening point in-creases,ductility decreases.The effect on phase change to improve the performance of asphalt,modification works the best when the dosage is 11%.Anticoagulant performance of the ice phase change asphalt results from modified asphalt and asphalt shows that:the best anticoagulant ice phase change is the asphalt content of 4%,the freezing temperature of-4 ?.After the incorporation of modifiers,modified phase with increasing dosage of varying asphalt and freezing temperatures rise;When modifier content of 11%,the modified asphalt freezing phase transition tempera-ture of-3 ?,the effect of ice anticoagulant is better.To sum up,binary organic phase change materials can effectively improve the anti icing of asphalt,the follow-up study can choose the content of modifi-er modified 11%of phase transition asphalt(phase change material content is 4%).