温度对设置缓冲层水泥混凝土路面层间结合系数的影响

王兵¹，孙丰哲¹，董肇明¹，胡洪溪^2*，樊丽然²，胡朋²

1.山东东泰工程咨询有限公司，山东 淄博  256414；2.山东交通学院交通土建工程学院，山东 济南  250357

摘要：为研究设缓冲层的水泥混凝土路面各层间的结合状态，以AC-13沥青混合料为缓冲层，强度等级C30的混凝土为路面面层，水泥稳定碎石为基层制作试件，通过改造土工直剪仪剪切盒，在竖向荷载分别为0.327、0.627、0.927、1.227 kN，在温度分别为15、30、60 ℃下进行层间剪切试验。试验结果表明：相同温度下，水泥稳定碎石与缓冲层界面、水泥混凝土与缓冲层的层间抗剪强度均随竖向荷载的增大而增大；相同竖向荷载下，2个界面的层间抗剪强度均随温度升高而减小，摩阻因数、黏聚力和层间结合系数随温度升高而减小。各参数变化规律一致，可用层间结合系数综合表征层间结合状态。

关键词：水泥混凝土路面；缓冲层；剪切仪；抗剪强度；层间结合系数

The impact of temperature on the bonding coefficient between buffer layer and cement concrete pavement layers

WANG Bing¹, SUN Fengzhe¹, DONG Zhaoming¹, HU Hongxi^2*, FAN Liran², HU Peng²

1. Shandong Dongtai Engineering Consultants Co., Ltd., Zibo 256414, China;

2. School of Civil Engineering, Shandong Jiaotong University, Jinan 250357, China

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 pavement; buffer layer; shear device; shear strength; interlayer bonding coefficient