Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 236, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.117469
Keywords
Cement paste; Chloride binding; Chloride release; Phosphate corrosion inhibitor; Chloride binding isotherm
Categories
Funding
- Fundamental Research Funds for the Central Universities [2019B64814]
- Graduate Student Scientific Research Innovation Projects of Jiangsu Province [SJKY19_0461]
- National Key Technology Research and Development Program of China [2016YCF0401610]
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2015BAB07B04]
- Natural Science Foundation of China [51609075]
- Experiment Center of Mechanics and Materials in Hohai University
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The impact of three kinds of phosphate corrosion inhibitors (MFP, DHP and TSP) on chloride binding and release in cement pastes was investigated by means of chloride binding isotherms (CBIs), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). Experiments of chloride binding, chloride release in deionized water and phosphate solutions were implemented separately. The regularity and factors of CBIs are well studied and the results of CBIs showed that phosphate inhibitors reduced chloride binding chemically due to reactions between Friedel's salt and phosphates. Besides, the release of bound chloride can be well calculated by CBIs. Furthermore, a modified CBI, taking effective phosphate concentration into account, has been established, and chloride penetration predictions have been made consequently. (C) 2019 Published by Elsevier Ltd.
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