Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 168, Issue -, Pages 11-20Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.02.094
Keywords
Chemical self-healing; Microcapsule; X-ray computed microtomography; Inhibition; Corrosion rate
Categories
Funding
- National Natural Science Foundation of China [51538007/51478270/51378239]
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A novel chemical self-healing system, with sodium monofluorophosphate/ethyl cellulose microcapsules, is designed with the objective of inhibiting rebar corrosion in concrete materials under NaCl solution. The corrosive behavior is traced and analyzed in 3D visualization by the method of micro X-ray computed microtomography (X-ray mu CT). Environmental scanning electron microscopy (ESEM) and texture element analysis microscopy (TEAM) are used to verify the results from the X-ray mu CT measurement. The experimental results show that typical pitting corrosion features are detected directly by X-ray mu CT. The chemical self-healing system, with sodium monofluorophosphate/ethyl cellulose microcapsules, can postpone the rust procedure and effectively inhibit the rust rate of rebar in a simulated corrosion environment. The corrosion-inhibiting performance becomes significant with the microcapsules increasing. Moreover, a linear relationship between volume losses of rebar and time is deduced from the X-ray mu CT data. Corresponding corrosion ratios and corrosion rates are quantitatively calculated for comparison of the inhibition afforded by the chemical self-healing system. (C) 2018 Elsevier Ltd. All rights reserved.
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