Evaluation of Healing in Concretes with Chemical and Bacterial Solutions Exposed to Aggressive Chloride and Carbon Dioxide-Rich Environments

Fernanda Pacheco, Hinoel Zamis Ehrenbring, Roberto Christ (), Rodrigo Périco de Souza, Regina Celia Espinosa Modolo, Victor Hugo Valiatio, Bernardo Fonseca Tutikian and Zemei Wu
Additional contact information
Fernanda Pacheco: Polytechnical School, UNISINOS University, São Leopoldo 93022-750, Brazil
Hinoel Zamis Ehrenbring: Polytechnical School, UNISINOS University, São Leopoldo 93022-750, Brazil
Roberto Christ: Civil and Environmental Department, Universidad de la Costa, Calle 58 #55-66, Barranquilla 080002, Colombia
Rodrigo Périco de Souza: Polytechnical School, UNISINOS University, São Leopoldo 93022-750, Brazil
Regina Celia Espinosa Modolo: Polytechnical School, UNISINOS University, São Leopoldo 93022-750, Brazil
Victor Hugo Valiatio: Polytechnical School, UNISINOS University, São Leopoldo 93022-750, Brazil
Bernardo Fonseca Tutikian: Polytechnical School, UNISINOS University, São Leopoldo 93022-750, Brazil
Zemei Wu: College of Civil Engineering, Hunan University, Changsha 410082, China

Sustainability, 2024, vol. 16, issue 24, 1-20

Abstract: This paper aimed to evaluate two self-healing mechanisms of concrete exposed to chloride ions and carbon dioxide environments using chemical and bacterial solutions, contributing to understanding the real scenarios of concrete structures application. Expanded perlite (EP) impregnated with chemical and bacterial solutions with the aid of either a vacuum chamber or immersion was used in partial substitution of fine natural aggregate in ratios of 10%, 20%, and 30%. Samples were characterized by a compression strength test. Healing efficiency was evaluated with high precision in stereo zoom microscopy. Further characterization of the samples was obtained from SEM/EDS, and mineral content was determined from XRD. Samples impregnated with a chemical solution formed healing products identified as C-S-H, CaCO 3 , and SiO 2 across and overflowing the fissure. Samples impregnated with the bacterial solution presented a maximum continuous healing region of 1.67 mm and an average of 0.514 mm. A comparison of submersed and wet curing yielded an equal number of results between the techniques. Overall, the products formed were mostly calcite (CaCO 3 ) and C-S-H, while the presence of CO 2 and Cl − corrosives did not affect healing, with concentrations of 5% and 3%, respectively.

Keywords: self-healing concrete; chemical solution; bacterial solution; healing efficiency (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/16/24/10829/pdf (application/pdf)
https://www.mdpi.com/2071-1050/16/24/10829/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:16:y:2024:i:24:p:10829-:d:1540972

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().