Freeze and thaw processes are mostly observed in cold regions and impact the short- and long-term performances of road pavements. Thus, freeze and thaw processes should be considered when designing and constructing roads due to the potential change it will cause to the structure, arrangement and properties of the materials used in road construction. This study attempted to understand the effect of freeze and thaw (F–T) cycles on the stiffness properties of recycled concrete aggregates (RCAs). For this purpose, base and subbase samples prepared with RCAs are subjected to varying numbers of F–T cycles, and a series of resilient modulus and permanent deformation tests are conducted. Moreover, the different models were applied to estimate the resilient modulus and permanent deformation, and the suitability of each model was discussed. The experimental study results indicate that the geotechnical engineering properties of RCAs originating from Istanbul-Turkey are suitable for utilization as unbound base or subbase course materials. In the stiffness assessment, the highest resilient modulus was obtained after 5 F–T cycles and then decreased but was still higher than that of the nonfrozen samples except the subbase sample exposed to 20 F–T cycles. Lower plastic strain values were obtained for the base samples, and after F–T exposure, no drastic changes were observed in the permanent strain increments for the base materials, as seen in the subbase samples. Most of the RCA samples exposed to F–T cycles accumulated permanent strains with plastic creep behavior based on the shakedown theory.

冻结和融化过程通常在寒冷地区观察到，并会影响道路路面的短期和长期性能。因此，在设计和建造道路时，应考虑冻结和解冻过程，因为这可能会导致道路建设所用材料的结构，布置和特性发生变化。这项研究试图了解冷冻和解冻（FT）循环对再生混凝土骨料（RCA）刚度特性的影响。为此，对使用RCA制备的基础和次基础样品进行不同数量的F–T循环，并进行了一系列的弹性模量和永久变形测试。此外，使用不同的模型来估计弹性模量和永久变形，并讨论了每种模型的适用性。实验研究结果表明，源自伊斯坦布尔土耳其的RCA的岩土工程特性适合用作未绑定的基础或次基础课程材料。在刚度评估中，在5个F–T循环之后获得了最高的弹性模量，然后降低了，但仍然比非冷冻样品的弹性模量要高，除了暴露于20 F–T循环中的基础样品。基础样品的塑性应变值较低，暴露于F–T之后，未观察到基础材料的永久应变增量出现急剧变化，如在基础样品中观察到的那样。根据震动理论，大多数暴露于F–T循环的RCA样品会累积具有塑性蠕变行为的永久应变。