Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 246, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.118504
Keywords
Magnesium oxychloride cement concrete; Galvanostatic accelerated test; X-ray computed tomography; SEM test; 3D reconstruction
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Funding
- National Natural Science Foundation of China [51468039, 51868044]
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We investigated corrosion-induced crack formation of magnesium oxychloride cement concrete (MOCC) in saline soil. Accelerated corrosion of steel in MOCC occurred through an improved galvanostatic accelerated test. X-ray computed tomography, used to scan the MOCC after curing for 14 days, revealed surface cracks of 0.11 mm, 0.25 mm, and 0.44 mm. Steel corrosion, corrosion distribution and corrosion-induced cracks were investigated, using scanning electron microscope (SEM) study the interface transition zone of MOCC. Results show a good linear relationship between steel volume loss and an increase in crack width; a good exponential relationship between an increase in corrosion-induced crack volume and an increase in crack width; and a good exponential relationship between steel volume loss and an increase in the volume of corrosion products. Corrosion-induced cracks do not necessarily form in the direction of the corrosion distribution. The product of the interfacial transitional zones (ITZs) is needle-shaped, which causes the formation of a weak surface in the ITZs so that corrosion-induced cracks usually develop along those zones. (C) 2020 Elsevier Ltd. All rights reserved.
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