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Materials 2017, 10(1), 5; doi:10.3390/ma10010005

Quantification of the Service Life Extension and Environmental Benefit of Chloride Exposed Self-Healing Concrete

1
Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University, Tech Lane Ghent Science Park, Campus A, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium
2
Strategic Initiative Materials (SIM vzw), Project ISHECO within the Program “SHE”, Tech Lane Ghent Science Park, Campus A, Technologiepark Zwijnaarde 935, B-9052 Ghent, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Prabir K. Sarker
Received: 14 November 2016 / Revised: 2 December 2016 / Accepted: 16 December 2016 / Published: 23 December 2016
(This article belongs to the Special Issue Self-Healing Concrete)
View Full-Text   |   Download PDF [2045 KB, uploaded 23 December 2016]   |  

Abstract

Formation of cracks impairs the durability of concrete elements. Corrosion inducing substances, such as chlorides, can enter the matrix through these cracks and cause steel reinforcement corrosion and concrete degradation. Self-repair of concrete cracks is an innovative technique which has been studied extensively during the past decade and which may help to increase the sustainability of concrete. However, the experiments conducted until now did not allow for an assessment of the service life extension possible with self-healing concrete in comparison with traditional (cracked) concrete. In this research, a service life prediction of self-healing concrete was done based on input from chloride diffusion tests. Self-healing of cracks with encapsulated polyurethane precursor formed a partial barrier against immediate ingress of chlorides through the cracks. Application of self-healing concrete was able to reduce the chloride concentration in a cracked zone by 75% or more. As a result, service life of steel reinforced self-healing concrete slabs in marine environments could amount to 60–94 years as opposed to only seven years for ordinary (cracked) concrete. Subsequent life cycle assessment calculations indicated important environmental benefits (56%–75%) for the ten CML-IA (Center of Environmental Science of Leiden University–Impact Assessment) baseline impact indicators which are mainly induced by the achievable service life extension. View Full-Text
Keywords: concrete cracking; autonomous healing; encapsulated polyurethane; chloride diffusion; service life prediction; life cycle assessment (LCA) concrete cracking; autonomous healing; encapsulated polyurethane; chloride diffusion; service life prediction; life cycle assessment (LCA)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Van Belleghem, B.; Van den Heede, P.; Van Tittelboom, K.; De Belie, N. Quantification of the Service Life Extension and Environmental Benefit of Chloride Exposed Self-Healing Concrete. Materials 2017, 10, 5.

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