Induction healing of concrete reinforced by bitumen-coated steel fibres

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Abstract

Cracking in concrete structures compromises the durability and functionality of the structures themselves. Different kinds of self-healing concretes, less or more sophisticated, have been developed in the past ten years to overcome early cracks in structures. An experimental study of a novel self-healing concrete is presented. Bitumen, used as the healing agent, is introduced in fresh fibre-reinforced concrete as the coating of steel fibres. The mechanism exploits induction energy to heat up the steel fibres inside the cracked concrete matrix; the bitumen then melts and finally flows into the cracks, sealing them. The aim of the research is to set up the main parameter affecting the performance of the healing mechanism as well as its efficiency. In order to achieve this goal, the microstructure of healed specimens has been studied through Light Microscope. Mechanical behaviour and permeability of the samples, before and after healing, were also checked. Fiber content is studied in the paper amongst the many parameters affecting the mechanism. Results point out the potential of the proposed self-healing mechanism to contrast early cracking (i.e. due to shrinkage). Presence of a certain amount of fibres bridging the crack highly influenced the healing efficiency, and so a uniform distribution inside the concrete matrix, which was directly related to fibre amount and its optimum concrete matrix.
Original languageEnglish
Title of host publication9th International Conference on Fracture Mechanics of Concrete and Concrete Structures
Subtitle of host publicationBerkeley, California USA
EditorsV. Saouma, J. Bolander, E. Landis
Number of pages8
DOIs
Publication statusPublished - 2016
Event9th International Conference on Fracture Mechanics of Concrete and Concrete Structures - University of California, Berkeley, United States
Duration: 22 May 201625 May 2016
Conference number: 9
http://framcos.org/FraMCoS-9.php#gsc.tab=0

Conference

Conference9th International Conference on Fracture Mechanics of Concrete and Concrete Structures
Abbreviated titleFraMCoS-9
CountryUnited States
CityBerkeley
Period22/05/1625/05/16
Internet address

Keywords

  • self-healing
  • shrinkage cracking
  • SFRC
  • induction heating
  • bitumen

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    Romero Rodriguez, C., Chaves Figueiredo, S., Chiaia, B., & Schlangen, E. (2016). Induction healing of concrete reinforced by bitumen-coated steel fibres. In V. Saouma, J. Bolander, & E. Landis (Eds.), 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures: Berkeley, California USA https://doi.org/10.21012/FC9.134