Influence of bubble defects on the bonding performance of the interlayer interface of the CRTS III slab ballastless track structure

Abstract

In this research, the bonding performance of the interlayer interface was investigated via the two main factors of the size and number of bubble defects in combination with field tests. The mechanical index of the splitting tensile strength was used to characterize the bonding performance of the interlayer interface. The bubble defect areas of the specimens were divided into 13 classes. Via the statistical analysis of the bubble defects, the probability of the occurrence of small bubble defects was found to be greater than that of large bubble defects. For the same or a similar area ratio of bubble defects, the splitting tensile strengths of specimens with different bubble sizes were found to be different. The bond strength near the perfusion hole area was found to be relatively weak. The splitting tensile strength was also found to be larger at locations farther away from the perfusion hole area. This work provides an effective reference for the scientific evaluation of the pouring quality of the self-compacting concrete filling layer.