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Covercrete with hybrid functions: novel approach to durable reinforced concrete structures
RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
2012 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 63, no 12, p. 1119-1126Article in journal (Refereed)
Abstract [en]

Due to the corrosion of steel in reinforced concrete structures, the concrete with low water-cement ratio (w/c), high cement content, and large cover thickness is conventionally used for prolonging the passivation period of steel. Obviously, this conventional approach to durable concrete structures is at the sacrifice of more CO2 emission and natural resources through consuming higher amount of cement and more constituent materials, which is against sustainability. By placing an economically affordable conductive mesh made of carbon fiber or conductive polymer fiber in the near surface zone of concrete acting as anode we can build up a cathodic prevention system with intermittent low current density supplied by, e.g., the solar cells. In such a way, the aggressive negative ions such as Cl-, CO3 2-, and SO4 2- can be stopped near the cathodic (steel) zone. Thus the reinforcement steel is prevented from corrosion even in the concrete with relatively high w/c and small cover thickness. This conductive mesh functions not only as electrode, but also as surface reinforcement to prevent concrete surface from cracking. Therefore, this new type of covercrete has hybrid functions. This paper presents the theoretical analysis of feasibility of this approach and discusses the potential durability problems and possible solutions to the potential problems.

Place, publisher, year, edition, pages
2012. Vol. 63, no 12, p. 1119-1126
Keywords [en]
chloride, concrete, corrosion prevention, diffusion, durability, migration
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-2718Local ID: 4020OAI: oai:DiVA.org:ri-2718DiVA, id: diva2:960321
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2017-11-21Bibliographically approved

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