Research On Application Of High Performance Asphalt Concrete In Airfield Pavement

At present,most of the domestic airfield pavements are cement concrete pavements,and the method of renovation and maintenance adopted for the airfield concrete concrete pavements is to directly lay asphalt concrete surface layers on the original pavements to enhance the anti-sliding and shock-absorbing properties of airfield pavements,achieve the purpose of prolonging the service life of the airfield pavements.When the asphalt concrete pavements under the action of large loads such as aircraft loads,it is easy to cause rims,cracks and other diseases on the pavement surface.So,it is very necessary to enhance the performance of asphalt concrete applied on airfield pavements.Therefore,it is of great significance to carry out research on the application of high-performance asphalt concrete on airfield pavements.This dissertation was subsidized by the National Natural Science Foundation of China(51408446),first designed the SMA-13 asphalt mixture and AC-20 asphalt mixture that can be laid on the airfield pavements.The results show that the two asphalt mixtures designed in this dissertation have excellent high-temperature anti-rutting ability and good water stability,while other performance indicators also meet the specification requirements,so this high-performance asphalt mixture meets the design requirements.Then,the effect of different admixtures on the high temperature performance and low temperature performance of the asphalt mixture was studied through relevant performance tests.The results show that the Rut King Anti-rutting agent and PR M high-modulus agent can significantly improve the high temperature stability of asphalt mixture,and the asphalt mixture can maintain good low-temperature performance;compared with PR M high-modulus agent,the effect of Rut King anti-rutting agent on asphalt mixture performance is more obvious;the admixture scheme proposed by this dissertation is reasonable and feasible.Study on the effect of warm mixture on the road performance of asphalt mixture,and according to the on-site construction test results to evaluate high-performance asphalt concrete.The results show that 0.5% and 0.7% Evotherm warming agent can reduce the compaction temperature of SMA-13 asphalt mixture to around 150°C;0.5% and 0.7% Evotherm warming agent can reduce the compaction temperature of AC-20 asphalt mixture to around 140°C;the indexes of asphalt mixture with 0.7% warm mix additive are better than the indexes of asphalt mixture with 0.5% warm mix additive,and the difference of the indexes of asphalt mixture under these two kinds of mixing conditions is not obvious.And through the detection of the performance indicators of paving the airfield pavement on the project,when the paving temperature of SMA-13 asphalt mixture is reduced to 140°C and the paving temperature of AC-20 asphalt mixture is reduced to 120°C,the test results of two asphalt mixtures with 0.7% addition of Evotherm warming agent are still good.Therefore,for airfield paving construction with a large amount of asphalt mixture,Evotherm warming agent can effectively improve the low-temperature workability of asphalt mixture,effectively reduce the impact of cold storage on the airfield pavement’s pavement compaction degree,ensure the compaction effect.Finally,using the finite element software to analyze the sensitivity of airfield pavements parameters,the numerical simulation was used to evaluate the performance of high-performance asphalt concrete in the airfield pavements.The results show that the thickness and modulus of the asphalt concrete overlay can affect the mechanical response of the airfield pavement structure,using the compressive strain of asphalt layer and the shear stress of asphalt layer as the main evaluation index to determine suitable high performance asphalt concrete modulus and asphalt overlay structure thickness.Through the inspection of the asphalt pavement structure and cement pavement structure,the high-performance asphalt concrete overlay designed in this dissertation can be applied to the airfield pavements.