This research presents the macroscopic and microscopic performance of the early-age frost roller compacted concrete (RCC) interface to investigate the influence of pre-curing time and interval time on the performance of the RCC interface subjected to early-age frost damage. Therefore, several RCC specimens were developed under different pre-curing times (12 h, 24 h, 48 h, 72 h and 7 d) and different interval times (4, 12 and 24 h). The shear failure modes, shear strength, pore structure, interfacial transition zone crack width (W_c) and hydration products of the RCC interface were evaluated. Results reveal that the shear strength of early-age frost RCC interface increases with the increase in pre-curing time and decreases with the increase in interval time. In particular, the decrease in shear strength of the early-age frost RCC interface is the most critical after the final setting. The decrease in shear strength between the initial setting and the final setting follows. Moreover, the decrease in shear strength before the initial setting is minimal. The relationship between the macroscopic and microscopic performances of the RCC interface that suffered early-age frost damage was established: the shear strength increases with the decrease in porosity and W_c. Hydrostatic pressure increases are the leading cause of damage in the early-age frost RCC interface. Moreover, the early-age frost RCC interface exhibits higher porosity and W_c and fewer hydration products than the unfrozen RCC interface. Finally, a shear strength of early-age frost RCC was proposed based on the experimental results.

本研究介绍了早龄冻土碾压混凝土（RCC）界面的宏观和微观性能，以研究预养护时间和间隔时间对早龄冻害碾压混凝土界面性能的影响。因此，在不同的预固化时间（12 小时、24 小时、48 小时、72 小时和 7 天）和不同的间隔时间（4、12 和 24 小时）下开发了几种 RCC 试样。剪切破坏模式、剪切强度、孔隙结构、界面过渡区裂纹宽度（W _c) 和 RCC 界面的水合产物进行了评估。结果表明，早霜碾压混凝土界面的抗剪强度随着预固化时间的增加而增加，随着间隔时间的增加而降低。尤其是早霜碾压混凝土界面的抗剪强度下降在终凝后最为关键。初始设置和最终设置之间的剪切强度降低。此外，在初始设置之前剪切强度的降低是最小的。建立了早期冻害碾压混凝土界面的宏观和微观性能之间的关系：剪切强度随着孔隙率和W _{c的降低而增加}. 静水压力增加是早期霜冻碾压混凝土界面损坏的主要原因。此外，早霜碾压混凝土界面比未冻结碾压混凝土界面表现出更高的孔隙率和W _c以及更少的水化产物。最后，根据试验结果提出了早霜碾压混凝土的抗剪强度。