The Research On Detecting Asphalt Pavement Disease And Maintenance Decision Making

In recent years, as the priority strategic target of national development, China’stransport infrastructure has been developed rapidly on the basis of total value and scale. Dueto the growth of highway mileage and traffic flow, public’s demand has increased gradually.Therefore, how to carry out the maintaining work, make sure the highway on a goodoperational state is a very difficult task for the highway maintenance managerial personnel.Normally, the highway maintenance is a long-term, continuous and periodic procedure.Therefore, in the highway’s operational process, it is necessary to undertake a trackingmeasurement, generate a reasonable assessment and choose a scientific measure, so that thefund on ensuring the operational state of the pavement will be minimized to a certain level.In order to gain an ideal maintaining effect, one should have a reasonable maintenancedesign. As to some certain pavement maintenance projects, a reasonable maintenance designshould cover several design stages, i.e. detection, assessment, decision making and design,then make sure all these stages have been well link-upped. As a result, how to develop acomplete set of hardware and software system with the consideration of actual needs ofasphalt pavement maintenance design, and fully improve the efficiency and quality ofmaintenance design are vitally important.This article combined the national high-tech research and development plan projects,aims to undertake a series of researches and discussions on detecting asphalt pavementdisease and maintenance design. The key findings of this study are as follow:With consideration of the key features of asphalt pavement maintenance design, i.e.huge information and short design cycle, this article developed a set of Computer-AidedDesign tool for the detection of asphalt pavement disease and maintenance design. It is ableto cover the collection of pavement field diseases information, reduction of indoor data,assessment of the pavement service condition and decision of the pavement maintenance. Itdramatically improved the efficiency of maintenance design, scientificalness of maintenance decision, and served better for the maintenance procedure.Based on the disadvantages (i.e. drawbacks on the safety, speed, precision issues,higher price of automatic detection equipment, results cannot be easily used in maintenancedesign, unable to analyze causes of disease and etc.) of the traditional manual detectionmethod, this article proposed JGLYH-001pavement disease acquisition equipment which isa more suitable equipment for the needs of maintenance design. This new equipmentcombines GPS positioning technique, distance measurement device, triangulation method,and digital camera together, well solved the problems caused by the traditional manualdetection method. Specifically, it ensures the safety issues, improves the efficiency, and theresults can be used in maintenance design directly. The positional accuracy is able to meetthe requirements of planar location of pavement damaged investigation by using GPS modeGT-730test. The procedure is aimed at the actual characteristics of highway alignment,using piecewise cubic curve-fitting measurement to narrow the positional accuracy.MatrixVB is adopted in the fitting process which realized the hybrid programming of VisualBasic and matlab, therefore, the work efficiency has been improved dramatically.Road segment is the smallest management unit of pavement management. It is the basicof pavement detection, assessment, and decision making. If the partition of road segment isnot meticulous and reasonable, it will lower the efficiency of pavement assessment andmaintenance decision making. Besides, it may make the maintenance design insufficient orover conservative. As a result, it will cause a huge waste of maintenance fund and make themaintenance design unscientific. This article adopted cumulative difference method withpolylines approach to divide the road segment. Compare with clustering method, thistechnique is more convenience to use and able to meet the requirements of the partition ofmaintenance road segment. Many research pointed that there are an interrelationship amongthe indicators of pavement operational state, hence, if one can combine the related indictorstogether when partitioning road segment, the workload could be reduced and work efficiencycould be improved.Maintenance design is the core of pavement management, rationality of maintenancedesign directly affects the operational state of the pavement. This article adopted piecewise decision method, preliminary estimate the pavement maintenance type for each road segmenton the first stage; choose the suitable analytic hierarchy process model based on thepavement maintenance type on the second stage. The result shows that Analytic HierarchyModel is the most appropriate approach, it will reorganize human thought processes; make ascientific decision according to the systematic analysis method. It is essential to choose therational maintenance standards and establish a good hierarchical structure as they will affectthe feasibility of maintenance design.