Research On Construction Application Of Cold Patch Asphalt Mixture In Freezing Period

Cold patch asphalt mixture as a repair material for a pavement pit,it is becoming more and more favored and valued by the maintenance department.Due to the traditional hot mix asphalt mixture,when the road surface is repaired,it is influenced greatly by the temperature,and when the temperature is low,the repair quality is poor,it cannot be constructed during the freezing period.at this time,the damaged road surface will not only cause inconvenience to the driving,but also the snow melting into the water during the freezing period will seep along the pavement cracks,under the repeated action of the vehicle load,it will make the road surface Further deterioration of performance.But cold patch asphalt mixture is not affected and restricted by the weather,It can be used and patched at any time,the advantages of construction are convenient,quick and so on,it can be pre-manufactured,bagged sealed and stored for urgent needs,and has been increasingly concerned by related departments.It is very important for the study of cold patch asphalt mixture in freezing period.The paper starts from the strength formation mechanism of cold patch asphalt mixture,in-depth analysis of its composition and strength formation process,through the research and analysis of the composition structure of the cold patch asphalt mixture,obtained the structure type of cold patch asphalt mixture is the skeleton dense structure,through the self-developed cold fluid,the cold patch asphalt mixture is formed.According to the performance characteristics of cold patch asphalt mixture,tackifier,modifier,etc.are selected to add to cold fluid,self-design test plan,research on road performance of cold patch asphalt mixture,through research on and test road performance of the high temperature stability?water stability(freeze-thaw cycle rut test)?low temperature crack resistance,preliminary determination of cold filled asphalt mixture.And research on various road performance of initial strength?forming strength?water stability(Immersion Marshall Test and freeze-thaw split test)?compactness and looseness etc of preliminary determination of cold patch asphalt mixture?the selected cold patch asphalt mixture to further optimize the ratio.The fractal theory is used to optimize the grading,determine the reasonable range of ratio of filler to bitumen after optimize the grading.The final cold patch asphalt mixture is obtained,on this basis,the production process,storage method and construction technology of cold patch asphalt mixture are also put forward,and the analysis of economic and social benefits is carried out.The research of this cold patch asphalt mixture is mainly aimed at the pit repair in the frozen period of northeast China,based on a large number of tests,and relying on the actual project,the actual road surface pit repair pit In Liaoning Province highway,proven by practice,it is compl-etely feasible to repair the developed cold filled asphalt mixture during the freezing period.And it has a great effect.