CA mortar, as a filling layer, has been widely used in slab ballastless track. Since the creep deformation directly determines the track regularity and the train ride comfort, we investigated the effect of various stress levels on CA mortar creep. Results showed that the creep strain of CA mortar increased by 10 times when the stress level increased from 10%\({\sigma }_{p}\) to 40%\({\sigma }_{p}\). Furthermore, it was first discovered that creep of CA mortar was attributed to the organic–inorganic interface slip and the propagation of microcracks. This work proposed a new CA mortar creep model based on the micro-meso structure characteristics, and its accuracy of prediction was much higher than previous models, R² > 0.93.

CA砂浆作为填充层已广泛应用于板式无砟轨道。由于蠕变变形直接决定了轨道规则性和列车乘坐舒适性，我们研究了各种应力水平对 CA 砂浆蠕变的影响。结果表明，当应力水平从 10% \({\sigma }_{p}\)增加到 40% \({\sigma }_{p}\)时，CA 砂浆的蠕变应变增加了 10 倍。此外，首次发现CA砂浆的蠕变归因于有机-无机界面滑移和微裂纹的扩展。本工作基于微细观结构特征提出了一种新的CA砂浆蠕变模型，其预测精度远高于以往模型，R ²  > 0.93。