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Materials (Basel). 2017 Jan 8;10(1). pii: E49. doi: 10.3390/ma10010049.

A Novel Design of Autonomously Healed Concrete: Towards a Vascular Healing Network.

Author information

1
Mechanics of Materials and Construction, Vrije Universiteit Brussel, Pleinlaan 2, B-1080 Brussel, Belgium. pminnebo@vub.ac.be.
2
Mechanics of Materials and Construction, Vrije Universiteit Brussel, Pleinlaan 2, B-1080 Brussel, Belgium. glenn.thierens@vub.ac.be.
3
Mechanics of Materials and Construction, Vrije Universiteit Brussel, Pleinlaan 2, B-1080 Brussel, Belgium. glenn.de.valck@vub.ac.be.
4
Faculty of Engineering and Architecture, Department of Structural Engineering, Magnel Laboratory for Concrete Research, Ghent University, Technologiepark-Zwijnaarde 904, B-9052 Ghent, Belgium. Kim.vantittelboom@ugent.be.
5
Faculty of Engineering and Architecture, Department of Structural Engineering, Magnel Laboratory for Concrete Research, Ghent University, Technologiepark-Zwijnaarde 904, B-9052 Ghent, Belgium. nele.debelie@ugent.be.
6
Mechanics of Materials and Construction, Vrije Universiteit Brussel, Pleinlaan 2, B-1080 Brussel, Belgium. danny.van.hemelrijck@vub.ac.be.
7
Mechanics of Materials and Construction, Vrije Universiteit Brussel, Pleinlaan 2, B-1080 Brussel, Belgium. Eleni.tsangouri@vub.ac.be.

Abstract

Concrete is prone to crack formation in the tensile zone, which is why steel reinforcement is introduced in these zones. However, small cracks could still arise, which give liquids and gasses access to the reinforcement causing it to corrode. Self-healing concrete repairs and seals these small (300 µm) cracks, preventing the development of corrosion. In this study, a vascular system, carrying the healing agent, is developed. It consists of tubes connected to a 3D printed distribution piece. This distribution piece has four outlets that are connected to the tubes and has one inlet, which is accessible from outside. Several materials were considered for the tubes, i.e., polymethylmethacrylate, starch, inorganic phosphate cement and alumina. Three-point-bending and four-point-bending tests proved that self-healing and multiple self-healing is possible with this developed vascular system.

KEYWORDS:

multiple healing; self-healing concrete; vascular system

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