Evolution Mechanism of Interlayer Properties of CRTS III Slab Track during Construction
Source abstract
Abstract
The interlayer properties of the CRTS III slab track during construction directly affect its long-term service condition. This article introduces time-varying coefficients that characterize the early properties of the interface between track slab and SCC to improve the bilinear CZM. Based on this, an interlayer property evolution model of the CRTS III slab track during construction is established. The evolution mechanism of interlayer properties under complex loads and the influence mechanism of key parameters on them are revealed. The results show that after SCC pouring, the interlayer damage at the corner of the slab becomes a sensitive area due to the combined effects of SCC shrinkage and temperature gradients. Interlayer damage initially manifests at the corner of the slab before progressively spreading toward the center of the slab, influencing the composite performance and force transmission characteristics of the track structure. The interlayer bonding property, shrinkage performance of SCC, and construction temperature substantially affect interlayer damage evolution. To reduce the risk of damage, mineral admixtures and expansion agents can be added as additives to improve the bonding property and minimize shrinkage of SCC. Insulation measures should be taken for SCC during low-temperature construction, and SCC pouring construction below 0 °C and above 30 °C should be avoided.
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Research context
OpenAlex topics: Railway Engineering and Dynamics · Tunneling and Rock Mechanics · Geotechnical Engineering and Underground Structures
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
Zhejiang Institute of Intelligent Transportation, Zhejiang CICO, Hangzhou 310020, China
China Railway Engineering Design and Consulting Group Co., Ltd., Beijing 100055, China
Anhui Xingyu Track Equipment Co., Ltd., Bengbu 233000, China
Funding
Fundamental Research Funds for the Central Universities · 111 Project · Science and Technology Research and Development Project of China State Railway Group Co., Ltd. · Research Program of the Shandong Department of Transportation
References (41)
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