Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 265, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.120364
Keywords
Reinforced concrete; Cracks; Bacteria; Self-healing; Corrosion inhibition
Categories
Funding
- National Key Research and Development Program of China [2019YFC1906203]
- Natural Science Foundation of Shanghai [17ZR1441900]
- Opening Project of State Key Laboratory of Green Building Materials [2019GBM06]
Ask authors/readers for more resources
Cracking is inevitable in concrete due to its quasi-brittle nature. The presence of micro-cracks will not only impair concrete, but induce reinforcement corrosion by providing paths for the ingress of harmful species. In the past decades, a new technique to repair cracks automatically based on microbial induced carbonate precipitation has become attractive. This paper explored the crack healing potential of rein-forced concrete incorporated with ureolytic type microbial self-healing agents immobilized in porous ceramsite particles. Effects of healing on the mechanical and electrochemical performances of reinforced concrete were investigated. The maximum crack width that could be healed completely by bacteria was up to 450 mu m in 120 days. The highest regain ratios of flexural strength and modulus were achieved by bio-based healing when the initial damage degree was taken into account. As indicated by the Tafel polarization results, reinforcement corrosion was successfully inhibited by the crack closure from microbial precipitation without any side-effects. (C) 2020 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available