Research On Road Performance Of Foamed Warm Asphalt Mixture In Seasonal Frozen Zone

With the continuous improvement of my country's road network,the energy consumed by road paving under high temperature environment is increasing day by day.Today,with the emphasis on green production and lifestyle,more energy-saving and environmentally friendly asphalt warm mixing technology has emerged.To analyze and summary the road performance changes and deterioration laws of WMA-Foam warm mix asphalt mixture(WMA-Foam),the auther measured and compared its road performance index of high-temperature stability,low-temperature crack resietance and water stability by high-temperature rutting test,low-temperature trabecular bending teste and Marshall freeze-thaw splitting test of WMA-Foam warm mix asphalt mixture and 90# matrix asphalt mixture(HMA)that experienced 0,5,10,and 15 tines of salt freeze-thaw cycles by simulating the winter pavement operating conditions in the northeast seasonal freezing area through salt solution erosion and freeze-thaw cycles According to the "Highway Engineering Asphalt and Asphalt Mixture Test Regulations"(JTG E20-2011).In terms of the preparation technology of WMA-Foam:The optimum mixing amount of warm mixture is 0.2%,the optimum whetstone ratio is 4.8%,the optimum mixing temperature is 138?,and the optimum compaction temperature is 128?.In terms of performance comparison test for WMA-Foam road:(1)WMA-Foam performs well in various road uses,and all meet the requirements of the specification.Before undergoing salt freeze-thaw cycles,compared with HMA,its high temperature stability and water stability were increased by 4.2% and 13.0% respectively;(2)Under the salt freeze-thaw cycle conditions,the performance of WMA-Foam decays faster.After the salt freeze-thaw cycle reaches 10 times,the performance decline rate increases,the high temperature stability begins to be lower than HMA,and the salt freeze-thaw cycle reaches 15 After this time,the improvement of water stability performance was reduced from 13.0% to 5.3%,and the high temperature stability was reduced by 4.4%;(3)The low-temperature crack resistance of WMA-Foam is slightly worse than that of HMA,and after 10 salt freeze-thaw cycles,the performance decline rate increases.After 15 salt freeze-thaw cycles,its performance decreases by 10.3%.The road performance under cycling conditions needs further observation.In general,WMA-Foam's high-temperature stability and water-stability road performance are good,and both meet the specification requirements,but are greatly affected by salt freeze-thaw cycles;low-temperature crack resistance is slightly poor,and it has a long time salt freeze-thaw cycle.The road performance under working conditions needs further observation.