Research On Assessment Of Expressway Asphalt Pavement Condition And Maintenance Method

With increase of traffic mileage, the maintenance of expressway asphalt pavement becomes more and more important. The problems of early destroy about expressway asphalt pavement rapid attenuation of pavement function and decrease of practice application age appear, higher request is put forward to expressway maintenance administration. This paper researches on pavement condition survey, performance evaluation, performance prediction and maintenance decision of expressway asphalt pavement from practice question of its maintenance administration.Firstly, the paper researches on the assessment of the expressway asphalt pavement performance, practice measure data of ten typical sections are selected from survey expressway, establishes weighed geometric mean to calculate PQI, which includes SRI parameter that could enhance model precision. It regresses based on Markov decision and three year's data, establishes DR and IRI transfer probability matrix, forecasts PCI and IRI state in three years future.Secondly, maintenance measure collection is founded according to asphalt pavement maintenance technology criterion and expressway maintenance decision-making tree, pavement is compartmentalized sixty states, every which has feasible maintenance measure combined expressway practice circumstance of JiangSu Province.Through input-output principle, dally fee is added up to maintenance cost model, which makes pavement decision-making assessment system more rational.Finally, previous model is related to expert's mark and maintenance cost, by summarizing and analyzing much survey data, according to condition data and corresponding maintenance countermeasure, PQI and corresponding maintenance cost is counted, model between PQI and maintenance cost is established, which has objectivity and provides a compact reference method for expressway supervisor and maintenance countermeasure priority.