Microscopic Pore Characteristics of Ballastless Track Concrete under High-Frequency Loading and Freeze–Thaw Cycles
Source abstract
Abstract
In cold regions, ballastless tracks endure coupled train loads and freeze-thaw cycles, which drive micro-pore accumulation in concrete and substantially weaken structural bearing capacity. Existing research mostly focuses on individual factors, failing to accurately characterise damage mechanisms under coupled conditions. We developed a Dynamic Load and Freeze-Thaw Platform (DLFTP) for synchronous high-frequency load and freeze-thaw application, and used CT scanning with 3D pore reconstruction to investigate concrete microstructural evolution. Results show coupled conditions cause far greater porosity growth, pore morphology change and strength loss (36.36%) than single factors. This study reveals the microstructural performance evolution of cold-region ballastless tracks, supporting optimised durability design.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Innovative concrete reinforcement materials · Climate change and permafrost · Concrete and Cement Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Southwest Jiaotong University
Funding
National Natural Science Foundation of China
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