Prevention of steel corrosion in concrete containing calcium aluminate cement
- Title
- Prevention of steel corrosion in concrete containing calcium aluminate cement
- Author
- 안기용
- Issue Date
- 2013-08
- Publisher
- The Asian Civil Engineering Coordinating Council
- Citation
- 6th Civil Engineering Conference in Asia Region (CECAR6), Page. 7-13
- Abstract
- The present study concerns a development of inhibition technique for steel in concrete using a mixture of
calcium aluminate cement (Hereinafter CAC). The CAC is partially replaced for ordinary Portland
cement (OPC) in concrete, accounting for 5, 10 and 15% to total binder, to avoid unnecessary flash set. To
assess the inhibition effect, chloride binding capacity and corrosion propagation were mainly measured
using mortar specimen, assuming that gravel has no chemical influence on the chemical modification of
the cement matrix and pore solution, which directly affect the corrosion resistance. Simultaneously,
a development of concrete strength was monitored to confirm the applicability to in-situ. As a result,
a mixture of CAC with OPC imposed a high resistance to corrosion, as being ensured by monitoring of
galvanic current, corrosion potential and corrosion rate, when concrete specimens cast with a centrally
located steel bar were containing the variation level in the chloride ions ranging from 0.5 to 3.0% by
weight of binder. The corrosion resistance of CAC seems to arise from the higher binding capacity of
chlorides in the cement matrix, due to the high portion of C3A, which chemically reacts with chloride ions
to form an immobile crystallised salt. Despite the benefits of CAC in mitigating corrosion risk, the
strength of CAC mixture was 20-30% lower than OPC concrete in the condition of a damp curing at
approximately 20°C, at which the hexagonal hydration phase may be converted to the cubic phase,
leading to an increase in the porosity in the cement matrix.
- URI
- https://www.researchgate.net/profile/Joon-Park-15/publication/308651464_PREVENTION_OF_STEEL_CORROSION_IN_CONCRETE_CONTAINING_CALCIUM_ALUMINATE_CEMENT/links/57ea438008aeb34bc092b597/PREVENTION-OF-STEEL-CORROSION-IN-CONCRETE-CONTAINING-CALCIUM-ALUMINATE-CEMENT.pdfhttps://repository.hanyang.ac.kr/handle/20.500.11754/176028
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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