Air voids structure is the key parameter that affects the frost resistance of concrete, but traditional approaches of measuring the air voids of concrete are all destructive. This work utilizes the industrial computerized tomography to visualize the microstructure change during cyclic freeze/thaw test. The results indicate that the combination of industrial computerized tomography with subsequent image processing program can precisely measure the morphology and position of air voids in concrete. The air content measured by computerized tomography is slightly higher than that of traditional pore structure analyzer. The air content and spacing factor increase after cyclic freeze-thaw for both air-entrained and non-air-entrained concrete, and the variation rate of non-air-entrained concrete is several times that of air-entrained concrete. Besides, it can be directly observed from the reconstruction model that he air voids in air-entrained concrete experience no obvious expansion after cyclic freeze/thaw test, which increases the frost resistance of concrete.

气孔结构是影响混凝土抗冻性的关键参数，但是传统的测量混凝土气孔的方法都具有破坏性。这项工作利用工业计算机断层扫描来可视化循环冷冻/融化测试过程中的微观结构变化。结果表明，工业计算机断层扫描技术与后续图像处理程序的结合可以精确地测量混凝土中空隙的形态和位置。通过计算机断层扫描仪测得的空气含量略高于传统的孔结构分析仪。加气混凝土和非加气混凝土在循环冻融后的含气量和间距系数均增加，非加气混凝土的变化率是加气混凝土的几倍。除了，