Lightweight aggregate foam concrete (LAFC) is a quasi-brittle porous composite material with a large number of holes and micro-cracks in the internal structure, which directly affect the durability and reliability of the building structure. In this study, the extended finite element method (XFEM) is used to build a fracture performance simulation model of three-point bending (3-p-b) for the LAFC. The crack propagation pattern and the loading force variation law are investigated and compared with the fracture test. The results show that the calculated results are in good agreement with the experimental results, which indicate that the XFEM is an effective method to study the fracture properties of the LAFC.
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