期刊
CASE STUDIES IN CONSTRUCTION MATERIALS
卷 6, 期 -, 页码 63-71出版社
ELSEVIER
DOI: 10.1016/j.cscm.2016.12.001
关键词
Concrete track slab; High speed railway; Fatigue load; Steam-cured heat damage; Alkali-silica reaction; Delayed ettringite formation
资金
- National Basic Research Program of China (973 Program) [2013CB036201]
- High-Speed Railway Joint Funds of the National Natural Science Foundation [U1534207]
Deterioration mechanisms of some premature damaged steam-cured concrete track slabs (CTS) in Chinese railway less than 4 years were investigated. Field investigation, raw materials test and suspicious products analysis were carried out. Results show that steam-cured heat damage (SCHD) of concrete takes place in steam-cured process. Expansion products are ettringite in hydrated products and alkali-silica gels between the interface of hydrated products and coarse aggregate. SCHD makes CTS surface layer loose, porous and more micro-cracks. Long-term fatigue load from high-speed train acting on CTS enlarges concrete microcracks, leading to water penetrating into concrete easily in moist and rainy environment. In the process of water ingression, alkali-silica reaction (ASR) and delayed ettringite formation (DEF) take place, hence resulting in CTS cracking and premature deterioration. (c) 2017 The Authors. Published by Elsevier Ltd.
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