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Design Service Life of RC Structures with Self-Healing Behaviour to Increase Infrastructure Carbon Savings

Brás, A, Van Der Bergh, JM, Mohammed, H and Nakouti, I (2021) Design Service Life of RC Structures with Self-Healing Behaviour to Increase Infrastructure Carbon Savings. Materials, 14 (12). ISSN 1996-1944

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Abstract

Corrosion of reinforced concrete (RC) structures costs the UK GBP 23b annually and is one of the main durability problems contributing to the development of rust, spalling, cracking, delamination, and structural deterioration. This paper intends to demonstrate the benefit of using tailored self-healing bacteria-based concrete for RC corrosion minimisation and service life increase. The purpose was to evaluate the enhancement in the lifespan of the structure exposed to a harsh marine microenvironment by utilising a probabilistic performance-based method. Comparison is made with the performance of a commercially available solution and in terms of embodied carbon impact. Three different concretes, using CEM I 52.5N, CEM II/A-D, and CEM III/A, were tested with and without an iron-respiring bioproduct (BIO) and an added admixture corrosion inhibitor (AACI). Results show that bioproduct significantly contributes to service life increase of RC structures with CEMIII/A. The repair solution with self-healing behaviour not only increases RC service life, but also enables us to decrease the required cover thickness from 60 mm to 50 mm in an XS2 chloride environment. In both XS2 and XS3 environments, a comparison of CEMIII/A+BIO and CEMII/A-D+AACI concrete shows the benefit of using bioproduct in corrosion inhibition context, besides contributing to an embodied carbon reduction of more than 20%

Item Type: Article
Uncontrolled Keywords: 03 Chemical Sciences, 09 Engineering
Subjects: T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TD Environmental technology. Sanitary engineering
Divisions: Civil Engineering & Built Environment
Pharmacy & Biomolecular Sciences
Publisher: MDPI
Date Deposited: 17 Jun 2021 08:48
Last Modified: 17 Jun 2021 09:00
DOI or Identification number: 10.3390/ma14123154
URI: https://researchonline.ljmu.ac.uk/id/eprint/15138

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