防火水泥基复合材料的制备及其与钢构件协同工作性能  

Preparation of Fire-Resistive Engineered Cementitious Composites and Its Cooperative Deformation Performance with Steel Member

作　　者：林建辉 余江滔[2] 商兴艳 LIN Jianhui;YU Jiangtao;SHANG Xingyan(College of Civil Engineering,Xiamen University Tan Kah Kee College,Zhangzhou 363105,Fujian,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]厦门大学嘉庚学院土木工程学院,福建漳州363105 [2]同济大学土木工程学院,上海200092 [3]山东建筑大学土木工程学院,济南250101

出　　处：《硅酸盐学报》2023年第5期1355-1362,共8页Journal of The Chinese Ceramic Society

基　　金：福建省中青年教师教育科研项目(JAT191083);国家自然科学基金项目(51478362);国家自然科学基金青年科学基金项目(51908339)。

摘　　要：使用国产原材料,制备轻质高延性水泥基复合材料作为防火涂料(FR-ECC),论证了FR-ECC作为防火涂料的可行性.通过轴拉试验和轴压试验研究不同配合比FR-ECC的力学性能,并利用四点弯曲梁试验研究FR-ECC与钢构件协同工作性能.结果表明:3种配方的FR-ECC均具有多裂缝开裂和应变强化的特征,平均抗拉强度1.30 MPa,平均极限应变1.93%.轴压试验显示:材料具有良好的受压变形能力,平均抗压强度3.99 MPa;适当增加纤维掺量可以提升其拉、压力学性能.四点弯曲梁试验表明:涂层越薄越能适应较大的弯曲变形;在涂层厚度不大于10 mm时,FR-ECC随钢梁变形会产生细小裂缝,而不会起层或剥落.FR-ECC在复杂应力下具备与钢构件协同变形的能力.Lightweight and high ductility cementitious composite was developed as a fire-resistive coating(FR-ECC)with domestic raw materials.The feasibility of FR-ECC as fire-resistive coating was demonstrated.The mechanical properties of FR-ECC with different proportions were investigated via axial tensile test and compressive test.The cooperative deformation performance of FR-ECC and steel member was determined via four-point bending beam test.The results indicate that FR-ECC with three proportions has the characteristics of multi-cracking and strain-hardening with an average tensile strength of 1.30 MPa and an average strain capacity of 1.93%.The results of compressive test show a high compressive deformation capacity of FR-ECC with an average strength of 3.99 MPa.The tensile and compressive properties can be enhanced by increasing the fiber content.According to the results of the four-point bending beam test,FR-ECC can adapt to a larger bending deformation as the coating thickness decreases.When the coating thickness is no more than 10 mm,FR-ECC can produce some fine cracks with the deformation of the steel beam instead of delaminating or falling off.FR-ECC has a capability of cooperative deformation with steel member under a complex stress.

关 键 词：防火水泥基复合材料 应变强化 协同变形 界面剥离 

分 类 号：TU502.6[建筑科学—建筑技术科学]