Influences of cement asphalt emulsified mortar construction on track slab geometry status  

作　　者：Tao Wang Shaoliang Wu Hengqiong Jia Zhao Wei Haiyan Li Piyan Shao Shanqing Peng Yi Shi 

机构地区：[1]China Academy of Railway Sciences Corporation Limited,Metals and Chemistry Research Institute,Beijing,China

出　　处：《Railway Sciences》2023年第4期447-458,共12页铁道科学（英文）

基　　金：funded by the National Natural Science Foundation of China(No.51408610).

摘　　要：Purpose–The construction of cement asphalt(CA)emulsified mortar can obviously disturb the slab status after the fine adjustment.To decrease or eliminate the influence of CA mortar grouting on track slab geometry status,the effects of grouting funnel,slab pressing method,mortar expansion ratio,seepage ratio and grouting area on China Railway Track System Type(CRTS I)track slab geometry status were discussed in this paper.Design/methodology/approach–Combined with engineering practice,this paper studied the expansion law of filling layer mortar,the liquid level height of the filling funnel,the pressure plate device and the amount of exudation water and systematically analyzed the influence of filling layer mortar construction on the state of track slab.Relevant precautions and countermeasures were put forward.Findings–The results showed that the track slab floating values of four corners were different with the CA mortar grouting and the track slab corner near CA mortar grouting hole had the maximum floating values.The anti-floating effect of“7”shaped slab pressing device was more efficient than fixed-joint angle iron,and the slab floating value could be further decreased by increasing the amount of“7”shaped slab pressing devices.After CA mortar grouting,the track slab floating pattern had a close correlation with the expansion rate and water seepage rate of CA mortar over time and the expansion and water seepage rate of the mortar were faster when the temperature was high.Furthermore,the use of strip CA mortar filling under the rail bearing platform on bothsides could effectively reduce the float under the track slab,and it could also save mortar consumption and reduce costs.Originality/value–This study plays an important role in controlling the floating values,CA mortar dosage and the building cost of projects by grouting CA mortar at two flanks of filling space.The research results have guiding significance for the design and construction of China’s CRTS I,CRTS II and CRTS III track slab.

关 键 词：Ballastless track Track slab CA mortar Geometry status 

分 类 号：U213.1[交通运输工程—道路与铁道工程]