Research On Action Mechanism And Handling Technology Between Cement Concrete Pavement And Lean Cement Concrete Base

After the investigations on the using condition of several domestic highwaysurfaces made up of cement concrete,we found that that it is temperature variationand remained water between layers that are causing the service life of the highwaysurfaces to be reduced.Therefore,we have been researching on the action mechanismas well as the handling technology between the lean cement concrete base and thecement concrete pavement so as to reduce or avoid the destructiveness of the highwaysurface made by temperature variation or the remained water between levels and thento prolong the service life of the cement concrete highway pavement.The research on the interlayer action mechanism is started based on howtemperature variation influences on the using function of the pavement,so that it isfound that break destruction will happen to the boundary layers between levelsinevitably and then the level contacting modals of level transitional layer;Wedeveloped the scene level passing testing instrument with which we have done theexperiment of level boundary layer's stress and strain,then we got the parameter oflevel boundary layer whose level transitional layer has been broken and destructed;And then started the special research on level mechanics by carrying on kneadingboard non-temperature warping distortion as well as by computing the stress andstrain abilities of highway pavement with warping distortion to get the best contactparameter of levels and point out that the lean cement concrete base surface needpolish processing.It is uneconomical and impractical to polish most of the basesurface,so we suggest establishing flexible insulating layers between levels andcomputing the stress and strain of the pavement with flexible insulating layers to getbetter scopes of thickness and rigidity of level isolation layers,then clearly,it is goodto establish isolation layers to improve the stress characteristic of pavements bycomparing with those levels without isolation layers.With the influence on operational performance made by the remained waterbetween layers,we developed a kind of washing out testers which fit for the flexibleisolation layers with which we can carry on washout experiments of slurry seal course,micro surfacing and asphalt concrete,then the result is that the anti-washout functionof asphalt concrete is relatively better.Above all,according to the fact that the temperature variation and the remainedwater between levels influence on the function of the highway pavement made bycement concrete,we found that the best level material is a type of isolation levelwhich is 1cm thick and 900MPa rigid with function of draining water andanti-cracking while mentioned the best structural modal of level material.