复合防火自保温外模板抗折性能试验研究

为研究复合防火自保温外模板的抗折性能，对6个复合防火自保温外模板试件进行抗折试验，分析试件的破坏形态、受力性能、抗折强度以及抗折强度与弹性模量之间的相关性。结果表明：复合防火自保温外模板的破坏形态均表现为底部跨中砂浆层开裂，裂缝方向垂直于模板纵轴线且贯穿整个宽度；各试件的荷载-跨中位移曲线变化规律基本一致，最大荷载、抗折强度和弹性模量的均值分别为846.34 N、2.59 MPa、5 125 MPa，满足相应规范的要求，具有良好的抗折性能；复合防火自保温外模板的抗折强度与弹性模量在0.01水平上，相关系数R=0.972 5，具有较强的线性相关性。

Experimental Study on Flexural Behavior of External Formwork with Composite Fireproof and Self-insulation

In order to study the flexural behavior of external formwork with composite fireproof and self-insulation, six specimens were tested under loading. The failure modes, mechanical properties, flexural strength and the correlation between flexural strength and elastic modulus of specimens were analyzed. The test results show that the failure patterns of external formwork with composite fireproof and self-insulation are all manifested as cracks in the middle span mortar layer at the bottom, and the crack direction is perpendicular to the longitudinal axis of formwork and runs through the whole width. The load-displacement curves of the specimens were basically consistent, and the average values of the maximum load, flexural strength and elastic modulus are 846.34 N, 2.59 MPa and 5 125 MPa, respectively, which meets the requirements of the requirements of the corresponding specifications and have good flexural behavior. The flexural strength and the elastic modulus of the external formwork with composite fireproof and self-insulation are at the 0.01 level (R=0.972 5), showing a strong linear correlation.