The frost resistance durability and bubble parameters of high air content concrete under different freezing rate were studied from the perspective of macroscopic and microscopic properties. The frost resistance durability and air void parameters of concrete were analysed at multiple scales by electronic balance, non-metal ultrasonic tester and linear traverse method, respectively. The results indicated that the mass and dynamic elastic modulus of concrete decrease with the increase of freezing rate. As the freezing rate increases, the bubble spacing of concrete increases, and the average diameter of the bubbles becomes larger. Therefore, in addition to the low temperature during freezing, freezing rate is another important factor affecting the durability of concrete.
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