Experimental Study On Interlayer Contact-Bond Performance Of White And Black Pavement

Asphalt plus surface layer is the most commonly used repair renovation plan for old cement concrete pavement in my country.The advantages and disadvantages of interlayer bonding performance have a significant effect on the service life of white and black pavement.Due to the fact that the current pavement design in China is too simple for the original pavement treatment scheme and the related design provisions of the bonded layer,and the assumption that the stress and displacement are completely continuous between layers is not consistent with the actual state between layers of the white-and-black pavement,the white-and-black pavement design cannot effectively reflect the actual performance of the structure.This study is based on independently developed "Asphalt Mixed Particle Shear Analysis System" and Pressure Film Technology to conduct a mechanical behavior of white and black pavement interface,and proposes the original white plus Pavement optimal interface treatment process and sticky layer materials.The main research work and results conducted to this article are as follows:(1)Interface shear test results of the white-plus surface composite test piece of different interfaces,viscous layer materials and temperature show: Under the same viscous layer material,the shear intensity size is sorted by: horizontal strip> vertical Strip> Raw smoothness,shear destructive displacement of shear strength has the same law;under the same conditions,various viscosity materials are consistent with the law of shear and anti-tensile strength,and the intensity size is sorted as SBS modification.Asphalt> No.70 matrix asphalt> SBS + stone;shear strength,anti-drawing intensity is related to temperature index.The temperature sensitivity coefficient of different viscosity materials and the temperature sensitivity coefficient of the anti-drawing strength indicates that the interface shear is more effective than the truthcharacterization of the interval.(2)The test results of the pressure film(LLLW)contact area show that there is a significant stress concentration in the interface,and the uniform hypothesis in the past studies is incorrect.The contact area of the interfacial groove> The interface is smooth.Different bonding layer materials are sorted by: No.70 matrix asphalt> SBS modified asphalt> SBS modified asphalt + stone;white plus black pavement material layer stress presents single peak distribution,the contact surface area is in stress The contact surface stress of the largest,white and black pavement material is achieved in 0.15 MPa to 0.2 MPa,and the contact area corresponding to the interval is the same as the total change trend of the interface particles;the interface shear test model parameter analysis results It shows that the interfacial shear performance of the white plus surface surface cannot be simply used to characterize the interfacial shear performance with shear strength peaks.(3)The test results of the pressure film(LLLW)contact area show that there is a significant stress concentration in the interface,and the uniform hypothesis in the past studies is incorrect.The contact area of the interfacial groove> The interface is smooth.Different bonding layer materials are sorted by: No.70 matrix asphalt> SBS modified asphalt> SBS modified asphalt + stone;white plus black pavement material layer stress presents single peak distribution,the contact surface area is in stress The contact surface stress of the largest,whiteplus black pavement material is achieved in 0.15 MPa to 0.2 MPa,and the contact area corresponding to the interval is the same as the total change trend of the interface particles;the interface shear test model parameter analysis results It shows that the interfacial shear performance of the white and black pavement cannot be simply used to characterize the interfacial shear performance with shear strength peaks.