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Amino-alcohols as corrosion inhibitors against sulphate-induced corrosion of mild steel reinforcement in fresh calcium sulphoaluminate based cementitious materials: Preliminary studies

Author(s): Yegor Morozov, Simone Pellegrini, Sergio Lorenzi, Fátima Montemor
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 99-104
Total Pages: 6
Language : English

Abstract: Calcium sulphoaluminate cements (CSA) are unique in properties and application. However, despite numerous advantages, the corrosion of mild steel reinforcement in fresh CSA mortars and concretes at early stages of binder hydration, caused by the combination of low pH and high concentration of dissolved sulphates, is their greatest limitation. Thus, the elimination of rebar corrosion is the indispensable requirement for wide market acceptance and successful application of CSA in construction practice. In this regard, the use of corrosion inhibitors seems to be the most promising solution, considering cumulatively the ease of their introduction into existing construction practice, expected corrosion prevention efficiency, and costs, supported by the fact that they would be required only for short periods.
The performance of corrosion inhibitors of amino-alcohol family was briefly assessed by electrochemical impedance spectroscopy in simulating alkaline solutions containing sulphates. In this paper 2-aminoethanol (MHEA), diethanolamine (DHEA) and triethanolamine (THEA) as well as commercial corrosion inhibitor blends – Sika® FerroGard® 901 (SF901) and Sika® FerroGard® 903 (SF903) were tested as preventive repair measure. Highly preliminary results suggested that MHEA and SF903 eliminated sulphate- induced depassivation of steel, providing long-lasting protection of reinforcement, thus they should be addressed in the future for detailed and versatile studies.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00

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