Study On The Noise Reduction And Anti-Skid Cold Mixing Thin Layer Overlay Material And Road Performance

Since the 20 th century,after a long time and large-scale highway construction,the development of China ’s highway industry has transitioned to a new stage of maintenance.The increasing demand for maintenance has promoted the development and maturity of maintenance technology.According to different pavement technical conditions,selecting the appropriate maintenance technology scheme can effectively restore the comprehensive performance of the pavement and prolong the service life of the road.Preventive maintenance technology is suitable for pavement with good technical condition,which can delay the time of large and medium repair and reduce the maintenance cost.Micro-surfacing and thin-layer overlay are commonly used preventive maintenance technologies.Both technologies have many advantages,but high control noise and insufficient control of thin layers have become the main problems limiting its performance and application.Therefore,research on support technologies that can reduce noise management and reduce carbon emissions is very important for improving the quality of road support and green development support.In this thesis,a noise reduction and anti-sliding cold mix cold paving thin layer overlay technology is proposed,and its material and road performance are studied.Firstly,the influence of SBS modifier,modifier,emulsifier and SBR latex on the basic properties of composite modified emulsified asphalt was analyzed by single factor variable analysis method.The results show that SBS LG-501 has better compatibility with matrix asphalt,and emulsifier 417 has the best emulsifying effect on asphalt.After comparative analysis,the modified emulsified asphalt prepared by using 5 % LG-501,2 % modified additives,1.6 % emulsifier 417 and 2 % SBR latex has good storage stability.The softening point of the evaporation residue is 80 °C and the ductility is 40.2 cm.The rheological test and low temperature creep test verify that the composite modified emulsified asphalt has good high and low temperature performance.Secondly,in order to ensure the good noise reduction effect of cold mix and cold lay thin layer,based on MS-3 and STC-5 gradation,2.36 mm is set as the key sieve hole and its passing amount is controlled.The gradation range of cold mix and cold lay thin layer and two synthetic gradations are designed.The amount of water and cement is determined by mixing test.The optimum oil stone ratio is determined to be 7 % by wet wheel wear test and load wheel sand adhesion test.Finally,the road performance of cold mix cold paving thin layer is studied,and compared with that of micro-surfacing and thin layer overlay.The research shows that the road performance of 1 # and 2 # cold mix cold paving thin layer is obviously better than that of micro-surfacing,and there is a certain gap with the thin layer cover.Among them,the noise value of 1 # and 2 # cold mix cold paving thin layer is 3.5 d B and 2.2 d B lower than that of micro-surfacing,and the noise value of 1 # cold mix cold paving thin layer is 1.5 d B lower than that of thin layer cover.When 0.1 % ～ 0.2 % fiber is added to the cold mix and cold lay thin layer,in addition to the attenuation of anti-skid performance,other road performance is improved to a certain extent.When the fiber content exceeds0.2 %,the fiber distribution is uneven,resulting in a decline in road performance.The pavement performance of 1 # cold mix cold paving thin layer is better than that of 2 #cold mix cold paving thin layer.When the fiber content is 0.2 %,the road performance of1 # cold-mixed cold-laid fiber thin layer is close to the thin layer overlay.