| Under the instruction of One belt and one road and develop—the—west strategy,it is bound to build more roads in the territories of Qinghai—Tibet Plateau which is one forth as large as China’s national territorial area.The technology of Warm mix asphalt,energy—saving and emission reduction,environment—friendly,construction period extended is best used in the plateau section,so the expansion of bituminous mixture is a must for promotion with its wide use.Therefore,home—made warm mix asphalt which is low priced and high functioned is greatly needed and warm mix asphalt modifier is more needed.:The paper relies on such projects as Fundamental Scientific research project in Sichuan province Department of Education“New Technique and Engineering Application of Low—carbon environmental asphalt pavements(project number:16ZB0164)”;Open Research Fund of Sichuan province Key Laboratory of Green Building and energy saving“The Study and Engineering Application of Green Energy — Saving asphalt pavements(project number :szjj2015—074)”and Fundamental open research of road engineering in Sichuan province key laboratory“The Study and Engineering application of energy—saving and emission—reduction asphalt pavements(project number:15206569)”.The objects of study are home—made ACMP warm mix modifier of organic viscosity,ACMP warm mix modified asphalt and ACMP warm mix asphalt mixture,on which the tests and theoretical researches were carried out.The emphasis is put on the micro and Nano structure of asphalt and some basic theories such as its mechanism of warm mix and modifier,the pave performance of modified warm—mix asphalt mixture was studied.At the same time,the fatigue performance of ACMP warm mix modified asphalt mixture was studied and the useful life of warm mix asphalt pavement was predicted with the help of gray system theory.The main research and outcome are as followed:(1)Performance tests were carried out on the newly home—made ACMP asphalt while comparing and contrasting the functions of the matrix asphalt.As the composite indicators showed,such figures were confirmed as the best mixing amount of ACMP—1 warm mix modifier additive is 8%,9% for ACMP—2 warm mix modifier additive and 15% for ACMP—3 warm mix modifier additive.(2)The basic theoretical research on warm mix asphalt is not enough in China,therefore,in order to solve this problem,with the use of the scanning electron microscope,fluoroscope and atomic microscope,some researches were carried out on warm mix modified asphalt.With the analysis of infrared spectrophoto,energy spectrum and nuclear magnetic resonance spectroscopy,there were some researches and studies on molecular structure of ACMP mix warm asphalt and its mechanism.By using this micro and nano methods,the mechanism of mix warm asphalt was studied from such aspects as surfacemicro—texture,nano—structure,chemical elements,molecular structure,colloidal structure and energy spectrum,while the mechanism of the modifiers is from such aspects as dispersed part,molecular weight,compatibility,reaction and cross—link,polymer mix and colloidal structure.By studying the mechanism of organic viscosity of ACMP,the paper illustrated the technical principles of the functions of modifiers on warm mix asphalt.By studying the mechanism of modifiers,the paper also analyzed the principles of increasing road use of asphalt mixture after the road construction.(3)Two kinds of experiments were carried out represented by two warm mix modified asphalt mixtures,in which one was AC—13 whose structure is dense and suspending and another one was SMA—13 whose structure is dense and framing.When ACMP—1 is used,the time to mix the sample can be extended by 120 s compared with SMA asphalt mixture which is mixed more difficultly than AC asphalt mixture.Based on the constructional experience,lab experiments and theoretical research,the method of confirming the temperature of ACMP—1 was pointed out and this method was proved to be more efficient than that of viscosity—temperature curve.After the combination of lab experiments and theoretical research,the conclusion was drawn as follows:The temperature to warm mix modified asphalt is 130℃~140℃ for ACMP—1,110℃~120℃for ACMP—2 and 70℃~80℃ for ACMP—3.Several tests were carried out such as freeze—thaw split test,immersion Marshal test,wheel—tracking test and cold—bending tests,and the functions of the road use was studied and examined,which includes water stability,high—temperature stability and low—temperature anti—cracking performance.By experiments,some indicators show the home—made ACMP is better than matrix asphalt in low—temperature performance and the water stability and its function is also similar to imported warm mix asphalt mixture.The experiments focused on the function of this new warm mix modified asphalt mixtures and studied their mechanism of strength increase.(4)Fatigue test of small beam was applied to ACMP warm mix modified asphalt mixture while using the wider — used and better — quality AC — 13 mixture and such equipment as UTM etc.The results were analyzed and conclusion was made.By studying the anti—fatigue performance of this mixture small beam,its fatigue properties were testified.In the meantime,the test confirmed this ACMP performed better than matrix asphalt AC—13mixture in fatigue performance,but inferior to SBS modified asphalt AC—13 mixture,rubber modified asphalt AC—13 mixture and warm mix rubber asphalt AC—13 mixture.(5)The method of predicting the useful life of warm mixing asphalt mechanism pavement is constructed by gray system theory,using MATLAB programming,support by pavement life changing design concept,which is feasible and accurate.(6)Efficiency—Analysis was made on the cost,energy—saving and emission—reduction and environmental protection of ACMP which was based on the trial road and solid construction.It showed that ACMP has the feasibility of engineering application and remarkable benefits in economy,society and environment.The ACMP warm mix modifier additive can not only make warm mix mixture possible but modify the asphalt,which helps the promotion of asphalt mixture in low—temperature areas and can extend the construction time of asphalt pavements in cold season.What’s more,it is an environment—friendly and energy—saving technique for its full use of the disposed material. |
