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Research paper | Open Access

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

Tao Wang, Shaoliang Wu( ), Hengqiong Jia, Zhao Wei, Haiyan Li, Piyan Shao, Shanqing Peng, Yi Shi
China Academy of Railway Sciences Corporation Limited, Metals and Chemistry Research Institute, Beijing, China
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Abstract

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 both sides 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.

Keywords

Ballastless trackTrack slabCA mortarGeometry status

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Railway Sciences
Volume 2 Issue 4,
November 2023
Pages 447-458
DOI: 10.1108/RS-10-2023-0030
Cite this article:
Wang T, Wu S, Jia H, et al. Influences of cement asphalt emulsified mortar construction on track slab geometry status. Railway Sciences, 2023, 2(4): 447-458. https://doi.org/10.1108/RS-10-2023-0030

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Received: 08 October 2023
Revised: 13 October 2023
Accepted: 13 October 2023
Published: 16 November 2023
© Tao Wang, Shaoliang Wu, Hengqiong Jia, Zhao Wei, Haiyan Li, Piyan Shao, Shanqing Peng and Yi Shi. Published in Railway Sciences.

This article is published under the Creative Commons Attribution (CC BY 4.0) licence. Anyone may reproduce, distribute, translate and create derivative works of this article (for both commercial and non-commercial purposes), subject to full attribution to the original publication and authors. The full terms of this licence may be seen at http://creativecommons.org/licences/by/4.0/legalcode
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