Anti-scouring Performance Evaluation Method Of Asphalt Pavement In High Temperature And Rainy Region

Asphalt pavement has widely been used in different levels of road,especially the highway,the survey found that the road had a lot of diseases such as rut,crack,loose flake and so on,and water damage is one of the most serious form of asphalt pavement damage,many scholars paid close attention to it.Water damage mechanism could be divided into physical function and power function,while asphalt pavement structure form,water permeability and the temperature of the moving load coupling effect are the direct factors influencing the pavement performance.Jiangxi Jinggang shan city belonged to subtropical monsoon climate,four seasons,abundant rainfall,this kind of high temperature and rainy climate was easy to cause "ater damage".Based on "the highway of Jingmu" project,team carried out experimental study scour resistance of asphalt mixture mainly and researched on high temperature and rainy region water stability of asphalt pavement evaluation methods,results are as follows:Firstly,carrying on the routine index test of the asphalt and aggregate,from the marshall test determining the optimum asphalt content of three kinds of mixture,and carrying out basic mechanics performance test of different asphalt mixture.On the basis of analysis research,determined the test parameters of new asphalt pavement wash machine,such as water pressure 0.7 MPa,pressure frequency 4s,Reducing pressure frequency 3s,flushing time 24h.Secondly,Mainly studied the diversification about dynamic water in the asphalt mixture’s performance,such as the influence of mechanical properties,the use of new type of dynamic flushing water draining device,Compared asphalt mixture after wash,studied the influence of the compressive strength,splitting strength,water seepage coefficient and erosion quantity.Experiment showed that water effect on the strength of the asphalt mixture had weakened effect,when the gap at a rate of 8%,residual strength ratio loss after dynamic flushing was biggest;permeability coefficient had certain correlation with porosity,increased with the increase of void fraction,but mixture from top to bottom was less permeable lateral permeable;Cycle under the action of dynamic water pressure,the asphalt mixture,the following table flour on material can escape,and the surface phenomenon is more prominent,different ChongShuaLiang size mixture,characterization of anti-scouring performance size is inconsistent.Learned that dynamic water effect had significantly influence of asphalt mixture.At last,according to the scouring test results,put forward the anti-scouring evaluation index(splitting strength,compressive strength,permeability coefficient,erosion quantity)and anti-scouring performance evaluation standard,to provide reference for further research or construction...