Aeolian sand is abundant and is widely distributed in western China and thus can reduce the project cost, alleviate the consumption of river sand resources, as well as protect the ecological environment in the application of concrete. Concrete structures, such as roads, bridges, and airport runways in northern cold regions, are exposed to the combined action of freeze–thaw cycle and fatigue load, and the damage mechanism is more serious and complex than that under a single factor. In the present study, the flexural fatigue behavior and damage evolution of aeolian sand concrete under freeze–thaw cycles are studied. Results show that freeze–thaw damage aggravates the flexural fatigue failure of concrete with aeolian sand, and the addition of aeolian sand enhances the average fatigue life of concrete after freeze–thaw cycle. The fatigue life of concrete that has aeolian sand content of 100% is improved more significantly than that of concrete with aeolian sand content of 50%. A double logarithmic fatigue equation is established for varying numbers of freeze–thaw cycles and different failure probabilities. Additionally, the course of flexural fatigue strain and fatigue modulus of aeolian sand concrete under freeze–thaw cycle action follows a typical three-stage development course. The effects of freezing and thawing action on fatigue behavior, such as fatigue strain growth, stiffness degradation, stress–strain relationship, and dissipated energy of 50% aeolian sand concrete (ASC50), are more significant, whereas the effects of 50 and 100 freeze–thaw cycles on the fatigue properties of 100% aeolian sand concrete (ASC100) are not evident. The research results are of great significance for the popularization and use of aeolian sand concrete in cold regions.

我国西部风积沙资源丰富，分布广泛，在混凝土应用中可降低工程造价，减轻河砂资源消耗，保护生态环境。北方寒冷地区的道路、桥梁、机场跑道等混凝土结构，在冻融循环和疲劳载荷的共同作用下，其损伤机理比单一因素下的损伤更为严重和复杂。在本研究中，研究了风积砂混凝土在冻融循环下的弯曲疲劳行为和损伤演化。结果表明，冻融损伤加剧了风积砂混凝土的弯曲疲劳破坏，风积砂的加入提高了冻融循环后混凝土的平均疲劳寿命。风积砂含量为100%的混凝土疲劳寿命比风积砂含量为50%的混凝土有更显着的提高。建立了不同冻融循环次数和不同失效概率的双对数疲劳方程。此外，风积砂混凝土在冻融循环作用下的弯曲疲劳应变和疲劳模量过程遵循典型的三阶段发展过程。冻融作用对50%风积砂混凝土（ASC50）疲劳应变增长、刚度退化、应力-应变关系、耗散能等疲劳行为的影响更为显着，而50和100冻结的影响– 解冻循环对 100% 风积砂混凝土 (ASC100) 疲劳性能的影响不明显。