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水泥混凝土在强度形成过程中,水泥砂浆体积变形受到约束后将导致水泥混凝土内产生残余应力。对水泥混凝土路面板而言,板表层水泥砂浆的体积变形受外部环境影响更严重,因此板表面存在较大的残余应力,超过其抗弯拉强度时将导致微观裂缝的出现。目前,根据金属工程中测量表面残余应力的钻孔法,相关学者提出了钻环测量水泥混凝土表面残余应力的方法,并对其可行性进行了分析。该文将在该方法可行性分析的基础上,建立有限元模型对钻环过程进行模拟,确定室内试验时钻环法的相关技术参数,然后浇注水泥混凝土板,考虑加载和不加载两种工况进行室内试验,试验结果表明:钻环能够释放板表面的残余应力,该方法可以用于水泥混凝土表面残余应力测量。
Cement concrete in the strength of the formation process, the deformation of cement mortar volume constraints will lead to residual stress in cement concrete. For cement concrete pavement slab, the volume deformation of the surface cement mortar is more serious by the external environment, so there is a large residual stress on the surface of the slab. When it exceeds the bending strength, it will lead to the appearance of micro-cracks. At present, according to the drilling method of measuring the surface residual stress in metal engineering, relevant scholars proposed a method of measuring the residual stress on the surface of cement concrete by a drill ring, and analyzed its feasibility. Based on the feasibility analysis of this method, this article will establish a finite element model to simulate the drilling process, and determine the relevant technical parameters of the drilling method for indoor testing. Then, pouring cement concrete slab to consider the two types of workers The results show that the drill ring can release the residual stress on the surface of the slab. This method can be used to measure the residual stress on the surface of cement concrete.