Study of concrete cracking during accelerated corrosion tests in reinforced concrete

Sanz Merino, Beatriz and Planas Rosselló, Jaime and Sancho Aznal, José María (2013). Study of concrete cracking during accelerated corrosion tests in reinforced concrete. In: "8th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-8)", 11/03/2013-14/03/2013, Toledo (España). ISBN 978-84-941004-1-3. pp. 2019-2028.

Description

Title: Study of concrete cracking during accelerated corrosion tests in reinforced concrete
Author/s:
  • Sanz Merino, Beatriz
  • Planas Rosselló, Jaime
  • Sancho Aznal, José María
Item Type: Presentation at Congress or Conference (Article)
Event Title: 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-8)
Event Dates: 11/03/2013-14/03/2013
Event Location: Toledo (España)
Title of Book: Fracture mechanics of concrete and concrete structures : proceedings of the 8th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-8), held in Toledo, Spain, 11-14 March 2013
Date: 2013
ISBN: 978-84-941004-1-3
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Cracking of reinforced concrete can occur in certain environments due to rebar corrosion. The oxide layer growing around the bars introduces a pressure which may be enough to lead to the fracture of concrete. To study such an effect, the results of accelerated corrosion tests and finite ele- ment simulations are combined in this work. In previous works, a numerical model for the expansive layer, called expansive joint element , was programmed by the authors to reproduce the effect of the oxide over the concrete. In that model, the expansion of the oxide layer in stress free conditions is simulated as an uniform expansion perpendicular to the steel surface. The cracking of concrete is simulated by means of finite elements with an embedded adaptable cohesive crack that follow the standard cohesive model. In the present work, further accelerated tests with imposed constant cur- rent have been carried out on the same type of specimens tested in previous works (with an embedded steel tube), while measuring, among other things, the main-crack mouth opening. Then, the tests have been numerically simulated using the expansive joint element and the tube as the corroding electrode (rather than a bar). As a result of the comparison of numerical and experimental results, both for the crack mouth opening and the crack pattern, new insight is gained into the behavior of the oxide layer. In particular, quantitative assessment of the oxide expansion relation is deduced from the ex- periments, and a narrower interval for the shear stiffness of the oxide layer is obtained, which could not be achieved using bars as the corroding element, because in that case the numerical results were insensitive to the shear stiffness of the oxide layer within many orders of magnitude

More information

Item ID: 29058
DC Identifier: http://oa.upm.es/29058/
OAI Identifier: oai:oa.upm.es:29058
Official URL: http://www.framcos8.org/frontal/default.asp
Deposited by: Memoria Investigacion
Deposited on: 05 Jun 2014 10:42
Last Modified: 22 Sep 2014 11:44
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