The interface between bricks and mortar is often the weakest part of masonry structures. For refractory linings, the interface strength must be measured at high temperature. Adapted slant shear tests and a new dedicated tensile test set up are proposed here for this purpose. To test the ability of the proposed method, it was applied on two representative brick/mortar couples from room temperature up to 1450 °C. Slant shear tests were conducted to measure ultimate compression and shear stresses and to identify temperature dependent parameters of the Mohr-Coulomb failure criterion. Tensile tests were performed to identify the tensile cut-off. Depending on the brick/mortar couples, the failure can appear at the interface or in the mortar. Cohesion and tensile strength decrease sharply over 900 °C.

砖和灰浆之间的界面通常是砖石结构中最薄弱的部分。对于耐火衬里，必须在高温下测量界面强度。为此，这里提出了适应性的斜切试验和新的专用拉伸试验装置。为了测试该方法的能力，将其应用于室温至1450°C的两个代表性砖/砂浆夫妇。进行斜切测试以测量极限压缩应力和切应力，并确定莫尔-库仑破坏准则的温度相关参数。进行拉伸测试以鉴定拉伸极限。取决于砖/砂浆夫妇，故障可能出现在界面或砂浆中。在900°C以上时，内聚力和拉伸强度会急剧下降。