MATEC Web Conf.
Volume 361, 2022Concrete Solutions 2022 – 8th International Conference on Concrete Repair, Durability & Technology
|Number of page(s)||8|
|Section||Theme 5 - Concrete and Admixture Technology|
|Published online||30 June 2022|
Self-healing of concrete containing commercial bacteria by means of water and chlorides permeability
1 Universitat Politècnica de València, Instituto de Ciencia y Tecnología del Hormigón, Valencia, Spain,
2 Universidade Federal de Mato Grosso do Sul, FAENG - Faculdade de Engenharias, Arquitetura e Urbanismo e geografia, Campo Grande, Brasil
3 Universitat Jaume I, Department of Mechanic Engineering and Construction, Castelló de la Plana, Spain
* Corresponding author: firstname.lastname@example.org
Microbial-induced calcium precipitation (MICP) has shown adequate potential to act as a healing product through Calcium Carbonate (CaCO3) precipitation inside cracks. This work studies the self-healing capability of conventional concrete incorporating two dosages of Bacillus subtilis encapsulated in diatomaceous earth and a liquid solution consisting of a combination of Bacillus, denitrifying, and photosynthetic bacteria. The two bacterial agents used are commercial or industrial products from other sectors. For these mixes, disks of size ϕ100×50 mm were pre-cracked at the age of 21 days by splitting test until reaching residual cracks of 100 to 450 µm. At the age of 28 days, self-healing was promoted during 28 days in three exposures, continuous water immersion at 20°C, a high humidity environment at 20°C and 95% of relative humidity, and 7 days immersed in water at 20°C and 21 days in the high humidity environment. Self-healing was analyzed with water permeability by comparing the results before and after healing. Afterward, chlorides’ penetration was performed to study the possible healing protection on cracked disks compared to uncracked reference disks. As a result, after 7 days of immersion in water, the mixes with bacteria presented acceptable healing results. Some healed cracks could also significantly reduce the penetration of chlorides towards the interior of the concrete matrix.
Key words: Bacillus Bacteria / MICP / Self-healing / Water Penetration / Chlorides / Autogenous Healing
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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