The impact of temperature on the bonding coefficient between buffer layer and cement concrete pavement layers
WANG Bing
SUN Fengzhe
DONG Zhaoming
HU Hongxi
FAN Liran
HU Peng
Abstract：To study the bonding state between different layers of cement concrete pavements with a buffer layer,AC-13 asphalt mixture is used as the buffer layer,and concrete with a strength grade of C30 is used as the surface layer.Cement-stabilized crushed stone is used for the base layer to fabricate specimens.Shear tests are conducted using a modified geotechnical direct shear apparatus with vertical loads of 0.327,0.627,0.927,1.227 kN at temperatures of 15,30,60 ℃.The test results indicated that,at the same temperature,the shear strength at the interface between the cement-stabilized crushed stone and the buffer layer,as well as the shear strength at the interface between the cement concrete and the buffer layer,both increase with the increase in vertical load.At the same vertical load,the shear strengths at the two interfaces decrease with the rise in temperature,and the friction coefficient,cohesion,and interlayer bonding coefficient also decrease with the increase in temperature.The variation patterns of each parameter are consistent,and the interlayer bonding state can be comprehensively characterized by the interlayer bonding coefficient.
Keywords：cement concrete pavementbuffer layershear deviceshear strengthinterlayer bonding coefficient
Publication Date：2025-03-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：6( 65-70 )