Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks.

##plugins.themes.bootstrap3.article.sidebar##

PDF Visual Abstract
Published Dec 22, 2021
DOI https://doi.org/10.3221/IGF-ESIS.59.32

##plugins.themes.bootstrap3.article.main##

Mohamed.A.R. Elmahdy
Misr Higher Institute of Eng. & Tech, Elmansura, Egypt
https://orcid.org/0000-0001-5469-6574 A.A. ELShami
Housing & Building National Research Centre, Dokki, Giza, Egypt
https://orcid.org/0000-0002-9075-7669 El-Shikh M. Yousry
Faculty of engineering, El mansura University, Egypt
Seleem S. E. Ahmad
Faculty of engineering, Zagazig University, Egypt
https://orcid.org/0000-0001-9894-0209

Abstract

The creation of cracks, which are the most common cause of structural failure, has a significant impact on the structure's strength and durability. As a result, effective repair and maintenance are vital and unavoidable for treating any of these issues. Self-healing mortar holds promising benefits for reducing the cost of repair as cracks are autonomously repaired without any human intervention. This study investigated the effect of bacteria type, bacteria content, bacteria concentration, and nutrient type on the properties of the self-healing mortar. Three types of bacteria, Bacillus sphaericus, Bacillus Megaterium, and Bacillus subtilis encapsulated in calcium alginate beads, were introduced into the mortar. Two concentrations of bacteria, 2× 108 and   2× 109 Colony Forming Units per milliliter, and different percentages of bacteria of cement weight were selected for the study. In addition, calcium lactate and calcium acetate were used at 0.5% of cement weight as nutrition for bacteria. Tests were performed for compressive strength, bending strength, SEM, EDX, and TGA/DTG. The results show a significant development in the mechanical behaviour of mortar, especially with Bacillus Megaterium using a 2.5% bacterial proportion with a concentration 2× 109 CFU/ml. This can be related to the filling of voids and cracks in microbial mortar by calcite, which was confirmed by SEM and EDX.

Comments

  1. Latest Oldest Top Comments

    Downloads

    Download data is not yet available.

    ##plugins.themes.bootstrap3.article.details##

    Issue
    Vol. 16 No. 59 (2022): January 2022
    Section
    Fracture

    How to Cite

    Ahmed Refat El-Mahdy, M. (2021) “Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks”., Frattura ed Integrità Strutturale, 16(59), pp. 486–513. doi: 10.3221/IGF-ESIS.59.32.
    Creative Commons License

    This work is licensed under a Creative Commons Attribution 4.0 International License.

    Copyright 
    Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.  

    Open Access Statement

    Frattura ed Integrità Strutturale (Fracture and Structural Integrity, F&SI) is an open-access journal which means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author. This is in accordance with the DOAI definition of open access.

    F&SI operates under the Creative Commons Licence Attribution 4.0 International (CC-BY 4.0). This allows to copy and redistribute the material in any medium or format, to remix, transform and build upon the material for any purpose, even commercially, but giving appropriate credit and providing a link to the license and indicating if changes were made.