The Research Of Preventive Maintenance Time Based On The Laboratory Test Fatigue Failure Of The Asphalt Pavement

Highway is the country's economic construction of a major infrastructure, especially in the asphalt pavement in China's highway mileage of a large proportion. In the great achievements have been made at the same time, we should also clearly understand that as the road repeatedly to bear load factors and natural destruction, the main asphalt concrete pavement damage patterns are:â‘ cracks, including horizontal cracks, longitudinal cracks, reflective cracking and splitting network;â‘¡deformation, including rutting, pushing;â‘¢damage to the surface,including oil bleeding, polished;â‘£water damage,including loose, hole, betty pulp, cracks is a major form of damage.So how to prevent disease and slow down the emergence of it in high-grade highway in China has attracted the close attention of road workers. However, we usually taken measures of maintenance after the road is damaged, it relatively easy to identify and determine the timing of maintenance, but preventive maintenance on roads is still in a good position to take conservation measures, which making preventive maintenance time facing a difficult problem.In order to ensure the effective use of the road, it is need to in-depth analysis of trends in road damage on the basis of their timely preventive conservation.Firstly, the main aggregate gap-filling method with the design, then under unconfined compressive strength test, test optimization rebound modulus graded, and then determine the best oilstone ratio is 4.1% by the use of Marshall test.Through the analyses of trabecular fatigue bending test data ,getting big grain diameter asphalts weary disintegration trend and characteristic, and also getting the life-span equation of strain and pertinent weary effect number of times, and carr reality according to influencing factor is amended. Through the cracks in the length of observation proved viscoelastic theory on the asphalt mixture of fatigue damage to the conclusion that the mixture of fatigue specimen is divided into three stages: the initial stage of destruction, damage phase of stability ying out, rapid destruction stage. And take interior experiment as basis, be tied in wedlock elasticity tier of shapes system basal principle, carrying out the standard road surface calculates by the BISAR procedure, and reach the road life time and the weary disintegration equation.On the basis as said or narrated above, testing that and analysing, Set performance indicators for the conservation of fatigue cracks in length. According to the conservation drawn from the experience after the decay of the roadbe hit by economic evaluation method combining with economics: Cost- effect method, The best being in progress to weary life-span of bituminous pavement trend brought forward by higher authority prevents nature from maintaining the opportunity research, ascertains the curing opportunity that cost- effect's ration when maximal maintaining opportunity for the best. First through the road the maintenance of decay curve identify conservation results, performance and the sudden deterioration rate; Second, the cost of preventive road maintenance fees and residuals, according to seven percent discount rate for the total cost of the discount; Again, determining the effect of the same cycle cost methods, and using the incremental quantitative analysis to set of the final preventive maintenance opportunity. Finally briefed asphalt pavement preventive conservation principles, methods, measures, technology and the impact of preventive maintenance service life factors.