The coefficient of friction is a quantity indicates the ratio of frictional force between objects. As pavement experiences thermal changes, it may slide against supporting subbase resistance. This resistance must be determined in order for pavement to perform as anticipated. Cracking of concrete does not occur if the pavement is jointed. In the joint plain concrete pavements, A separator layer is installed between the subbase and the plate to smooth the interface. A smooth surface shows less resistance to the concrete’s displacement caused by temperature difference. Two stages of the push-off test were conducted for subbase conditions (smooth and rough). Friction properties among the concrete and subbase were investigated based on the friction test results. The results show the parameters impacting the maximum coefficient of friction and displacement (interface condition, movement rate, thickness) respectively for friction and (movement rate, interface condition, thickness) for displacement. In conclusion, the frictional force rises significantly until the applied force reaches the stable condition. This force is affected by interface condition, which has the most significant impact, followed by movement rate and thickness. Changing conditions from smoother to rougher interface leads to raising maximum coefficient of friction regardless of changing slab thickness or movement rate.

摩擦系数是一个量，表示物体之间摩擦力的比值。当路面经历热变化时，它可能会在支撑底基层阻力的情况下滑动。必须确定该阻力，以便路面按预期运行。如果路面有接缝，则混凝土不会开裂。在接缝素混凝土路面中，在底基层与板之间安装隔板层，使界面平整。光滑的表面对混凝土由温差引起的位移的阻力较小。针对底基层条件（光滑和粗糙）进行了两个阶段的推出试验。根据摩擦试验结果研究混凝土和底基层之间的摩擦性能。结果显示了分别影响摩擦的最大摩擦系数和位移（界面条件、运动速率、厚度）和位移（运动速率、界面条件、厚度）的参数。总之，摩擦力显着上升，直到施加的力达到稳定状态。该力受界面条件的影响最大，其次是运动速率和厚度。无论板坯厚度或运动速率如何变化，从较光滑到较粗糙的界面变化都会导致最大摩擦系数增加。摩擦力显着上升，直到施加的力达到稳定状态。该力受界面条件的影响最大，其次是运动速率和厚度。无论板坯厚度或运动速率如何变化，从较光滑到较粗糙的界面变化都会导致最大摩擦系数增加。摩擦力显着上升，直到施加的力达到稳定状态。该力受界面条件的影响最大，其次是运动速率和厚度。无论板坯厚度或运动速率如何变化，从较光滑到较粗糙的界面变化都会导致最大摩擦系数增加。