To investigate the performance changes of cement asphalt mortar filling layer after several years of service,four typical CRTSⅡ type slab ballastless track high speed railway lines in the north and south region were selected for investigation.The damage situation and physical and mechanical properties of cement asphalt mortar filling layer were studied through on-site measurement,sampling and analysis,and querying of engineering section data.The results show that typical damages such as detachment,white slurry emission,and vertical cracks occur at the interface between the cement asphalt mortar filling layer and the track slab at four survey points.The main component of the white slurry is CaCO3,which contains a small amount of SiO2 and asphalt components.There are significant differences in the compressive strength,flexural strength,and apparent density of the mortar filling layer at the research points in the north and south region.However,they meet the specification requirements.The porosity of specimens in different parts of the mortar filling layer at the same research point in the north and south region is very close,while the porosity of specimens in the mortar filling layer at the southern research point is significantly higher than that at the northern research point.The cement asphalt mortar filling layer of CRTSⅡ type slab ballastless track still meets the service requirements,but there has been a certain degree of damage and performance degradation,which should be regularly observed and maintained.
关键词
无砟轨道/试验研究/水泥沥青砂浆/耐久性/服役现状
Key words
ballastless track/experimental research/cement asphalt mortar/durability/service status
维普
万方数据