Study On Comprehensive Technology Of Ultra-thin Asphalt Surface Functional Layer On Cement Concrete Pavement

It is a relatively ideal method to use the technology of ultra-thin asphalt surface functionallayers to improve the surface function of cement concrete pavement. However, as theultra-thin asphalt surface functional layers are thinner (2.0~3.0) and have a larger differencewith the module of cement concrete pavement, it is easy to occur shear failure and cuttingslippage. As a result, appropriate measures shall be taken to strengthen the shear behavior ofthe mixture of the surface functional layers and improve the interfacial bonding performance.Based on this, this Article focuses on the improvement of the design method of the mixture ofthe ultra-thin asphalt surface functional layers and the research and development of interlayeradhesive material in order to effectively solve those key technical problems in the paymentstructure of ultra-thin surface functional layers of cement pavement.Information about the changes in the maximum shear stress of the surface functionallayers and the contact condition between elastic layers is acquired through analysis of theshear stress of ultra-thin surface functional layers of cement pavement, providing thetheoretical basis and basic parameters for the design of the asphalt mixture of functionallayers and adhesive materials.The range of the porosity of mixtures based on the functionality and shear behavior isdetermined through the research of the relevant performance indexes related to the porosity ofmixture of surface functional layers, and the relevant performance index standards arerecommended, providing a reference for the design of mixtures.The aggregate grading range of mixture of surface functional layers is determined usingthe orthogonal test design method. The grading range can satisfy the functionality requirementof ultra-thin surface functional layers and meanwhile meet the requirement on the strengthperformance of mixture.The researches on the shear strength of mixture of ultra-thin surface functional layers,internal friction angle and the change law of cohesion along with the factors such as thegradation type, asphalt varieties, adjusting agent, loading rate and test temperature haveprovided test basis for the determination of the parameters of stress strength and the design ofmixture of ultra-thin surface functional layers. The method for the design of mixture of surface functional layers based on shear behavioris provided proceeding from three aspects including raw material selection, mix design andtesting of the pavement performance after summing up the relevant research results asdiscussed in the Article, with the appropriate design standards recommended.The researches on the law by which the high-temperature rut resistance, low temperatureperformance, water stability performance, anti-stripping performance, shear behavior anddurability of mixture of ultra-thin surface functional layers change with such three factorsincluding SBS in the asphalt, reinforcing agent and gradation have resulted in the bestcontents of SBS in the asphalt and reinforcing agent, and provided a test basis for thegradation selection, for the purpose of bringing the shear behavior of mixture of ultra-thinsurface functional layers into better play without further damaging other road performances.A preparation technology and formula for a type of high-performance emulsion asphalthave been provided through the research and development of interfacial bonding materials.The successful research and development of the high-performance emulsion asphalt is veryuseful in resolving the problems such as shear and shoving of ultra-thin surface functionallayers of cement pavement caused due to insufficient interfacial binding power.A comparison and validation of the superiority of high-performance emulsion asphalt inimproving the interlayer binding effect have been conducted with the interlaminar shear test,and the influence of interfacial agent on interlayer bond behavior has been particularly studied.It is found that interfacial agent can obviously improve the interlayer bond behavior. Thedesign standard of interlayer shear strength for ultra-thin surface functional layers of cementpavement has also been generated through the relevant mechanics calculations andexperimental research.