Based on practical engineering,this article conducts an in-depth analysis of the performance of high viscosity modified as-phalt through experiments,and further explores the construction technology of drainage asphalt pavement.The following conclusions are drawn:(1)Taking into account the results of various performance tests and economy,it can be concluded that the optimal dosage of High Viscosity Additive(HVA)for SBS modified asphalt is 9%;(2)For a high viscosity composite modified asphalt mixture with a HVA content of 9%and a polyester fiber content of 0.1%,the optimal mineral aggregate gradation is:m(mineral powder)∶m(0～3 mm)∶m(5～10 mm)∶m(10～15 mm)=3.5%∶9%∶42%∶45.5%,and the optimal oil stone ratio is 4.8%;(3)Due to the large proportion and particle size of coarse aggregate in drainage asphalt mixture,it is necessary to avoid the occurrence of coarse and fine aggregate segregation during construction,and strictly control the quality of mixing,transportation,paving,compaction and other construction processes.
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