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Durability of cracked SFRC exposed to wet-dry cycles of chlorides and carbon dioxide – Multiscale deterioration phenomena

Abstract

This paper describes an experimental study that comprised the exposure of cracked SFRC members to wet-dry cycles involving chloride and carbon-dioxide for two years. Results indicate that corrosion of steel fibres occurs mainly at the outer regions of the crack for cracks smaller than 0.3 mm, where the pH inside the crack drops below values of nine. The presence of chloride affected mainly the extent of corrosion. The results indicate that corrosion damage of the steel fibres does not necessarily play a dominant role on the overall deterioration of the composite; since changes in the microstructure of the matrix surrounding the crack and the fibre-matrix interface due to leaching and autogenous healing, may have a substantial impact on the long-term behaviour of the cracked composite. A conceptual deterioration model was developed, describing the deterioration and recovery mechanisms that alter the long-term mechanical performance of the cracked composite under wetting-drying conditions.
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Category

Academic article

Language

English

Author(s)

  • Victor Marcos-Meson
  • Mette Rica Geiker
  • Gregor Fischer
  • Anders Solgaard
  • Ulla Hjorth Jakobsen
  • Tobias Alexander Simon Danner
  • Carola Edvardsen
  • T.L. Skovhus
  • Alexander Michel

Affiliation

  • SINTEF Community / Architecture, Materials and Structures
  • Denmark
  • Technical University of Denmark
  • Danish Technological Institute
  • Norwegian University of Science and Technology

Year

2020

Published in

Cement and Concrete Research

ISSN

0008-8846

Volume

135

View this publication at Norwegian Research Information Repository