期刊
CORROSION
卷 78, 期 9, 页码 813-824出版社
NATL ASSOC CORROSION ENG
DOI: 10.5006/3910
关键词
3CaO center dot 3Al(2)O(3)center dot CaSO4; calcium sulfoaluminate cement; carbon steel reinforcement; electrochemical impedance spectroscopy; sulfate-induced corrosion
资金
- Fundacao para a Ciencia e Tecnologia (Portugal) [SFRH/BD/88016/2012]
- Centro de Quimica Estructural [UID/QUI/00100/2013, UID/QUI/00100/2019, UIDB/00100/2020, UIDP/00100/2020, LA/P/0056/2020]
- ITALY PROJECT of University of Bergamo
- COST [CA15202]
This study investigates the corrosion behavior of plain carbon steel in the liquid phase of CSA-based materials at different stages of binder hydration. The findings suggest that sulfate-induced corrosion of reinforcement starts at early stages of hydration, and continues despite favorable conditions in the hydrated state.
Ordinary Portland cement (OPC) is the main hydraulic construction material, the fabrication of which is an important source of carbon dioxide. Presently, alternative binders are attracting a lot of interest as a way to minimize their environmental impact. Calcium sulfoaluminate cements (CSAs) show massive potential for emissions reduction and possess unique properties. Nevertheless, there is an essential knowledge gap concerning the durability of CSA structures in terms of reinforcement corrosion. This work studies the corrosion behavior of plain carbon steel in media of fixed and variable composition that simulate the liquid phase of fresh CSA-based materials at different stages of binder hydration. The findings of electrochemical and nonelectrochemical techniques suggest that sulfate-induced corrosion of mild steel starts at early stages of hydration in pure CSA and in blended CSA-OPC binders. Once initiated, corrosion of reinforcement would continue regardless of favorable conditions found in the hydrated state in both systems, even though short-term repassivation was observed. In addition, the origin and possible solutions to tackle the corrosion problem are discussed.
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