Simulations Of Kerf Effects Of Roller-Compacted Concrete Base

As the road traffic and vehicle loads increase continually, early stage diseases such ascracking, mud jack, pit, etc. are shown in most of the highways after opening to traffic for afew years, which leads to a large sum of maintenance costs. Undoubtedly, it brings hugeeconomic losses to the country and negative social impact as well.Researches indicated that the roller compacted concrete asphalt pavement can overcomethe shortcomings of semi-rigid. However, because of lancing of roller compacted concretebase and original crack defects, reflecting cracking were easily occurred in the asphalt layerabove the lancing and original crack defects when the roads subjected to the repeated loads ofthe traffic and temperature, which cause the roads structure failure.In order to obtain the mechanism of reflecting cracking caused failure, this thesisperforms the researches on the mechanical response of lancing of roller compacted concretebase systematically, and then the systemic production is formed:Analysis of the stress of lancing of roller compacted concrete base under moving loadsby vary the axle load，the thickness and modulus of the asphalt surface，the thickness andmodulus of roller compacted concrete bas，the foundation modulus and the lancing spacingby employ FEM (Finite Element Method).The mechanical response of lancing of roller compacted concrete base subjected totemperature stress of the thickness and modulus of the asphalt surface，the thickness andmodulus were obtained by employ FEM (Finite Element Method).Based on literature review of a large number of relevant domestic and internationalresearch findings, analysis of the reflecting cracking generating mechanism and the stress ofgeotextile between the roller compacted concrete base and asphalt surface.As the stress nonlinear characteristics of graded broken stone, a three-dimensionalnonlinear finite element program was employed to analyze the anti reflection effect of gradedaggregate stone transitional layer. The results showed that the geotextile or graded graveltransition layer between rolled concrete base and asphalt surface layer or can effectivelyimprove the stress condition of the pavement structure, prevent and delay the produce of reflection cracks, thereby prolonging the service life of pavement.