水泥基管材力学性能评价方法

Methods for Evaluating Mechanical Properties of Cement-based Tubes

水泥基管材已广泛应用于市政、工业、能源等领域,准确的力学性能评价对管材构件的结构性能评估和质量控制至关重要。为解决水泥基管材力学性能难以评价的技术难题,针对缺口环和闭口环两种样品形式,基于材料力学理论推导了缺口环法与闭口环法测量管材弹性模量和弯曲强度的计算公式。利用缺口环法、闭口环法与三点弯曲法分别测得了硫铝酸盐水泥砂浆缺口环试样、闭口环试样与梁试样的弹性模量和弯曲强度。结果表明:三种方法所测得的弹性模量值与弯曲强度值均相近,由此证明缺口环法与闭口环法可以准确有效地测得管材试样的弹性模量和弯曲强度。

Cement-based tubes are widely used in the municipal,industrial,energy and other fields,and the accurate determination of the mechanical properties is very important to the structural performance evaluation and quality control of the tube components.To solve the difficult technical issues for the mechanical determination of the cement-based tubes,the analytic formulas of the elastic modulus and bending strength were deduced based on the theory of material mechanics for the split ring and closed ring amples,respectively.The split ring method,closed ring method and three-point bending method were used to evaluate the elastic modulus and bending strength of the split ring,closed ring and beam pieces which were prepared by the sulphoaluminate cement mortar,respectively.The experimental results show that the elastic modulus and bending strength measured by the three methods are very close,and demonstrate the validity and correctness of the split ring method and closed ring method.