Effect of Using Magnesium Acetate on the Self-Healing Efficiency of Hydrogel-Encapsulated Bacteria in Concrete

Hungria, Ricardo; Mousa, Momen R.; Hassan, Marwa; Omar, Omar; Gavilanes, Andrea; Arce, Gabriel; Milla, Jose; King, Gary M.

doi:10.1061/9780784483787.018

Cited by 5 publications

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“…As such, different researchers have adopted autonomic self-healing, which is a process that includes the use of engineered additives to improve self-healing efficiency ( 4 , 5 ). The following techniques were used in previous studies as autonomic self-healing techniques: bacterial concrete, chemical encapsulation, mineral admixtures, a chemical in glass tubing, and intrinsic self-healing with small self-controlled crack width ( 6 – 10 ).…”

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confidence: 99%

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Optimization of the Self-Healing Efficiency of Bacterial Concrete Using Impregnation of Three Different Precursors into Lightweight Aggregate

Omar

Mousa

Hassan

et al. 2022

Transportation Research Record: Journal of the Transportation R

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Implementation of self-healing concrete technologies is a promising approach to enhance the durability of the transportation infrastructure. Among these technologies, bacterial concrete has the potential to seal microcracks through microbial-induced calcite precipitation (MICP). To ensure the viability of this technology, bacterial protection is essential given concrete’s harsh environment. Additionally, the success of this technology depends on the presence of an adequate mineral precursor compound and nutrient for the bacteria. As such, the main objective of this study was to optimize the healing efficiency of bacterial concrete in subtropical climates through the vacuum impregnation of bacteria into a lightweight aggregate (LWA). To achieve this objective, mortar samples were prepared while incorporating different combinations of precursors (magnesium acetate, calcium lactate, and sodium lactate) and alkali-resistant healing agent Bacillus pseudofirmus bacteria (with and without). In addition, a control sample was prepared without bacteria or precursors for comparative purposes. For each sample, three mortar cubes and three mortar beams were cast and used to evaluate the compressive strength, crack healing efficiency, and flexural strength recovery. Additionally, the morphology of healing products was observed in bacteria-containing samples under scanning electron microscopy with energy x-ray dispersive spectroscopy using a scanning electron microscope (SEM) with EDAX Pegasus energy dispersive spectroscopy (EDS). Results showed that self-healing bacterial concrete could be optimized (without significant reduction in mechanical properties) if Bacillus pseudofirmus bacteria at a concentration of 108 cells/ml and sodium lactate precursor at a concentration of 75 mM/l were impregnated into lightweight aggregate.

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confidence: 99%

“…Bacterial concrete is an autonomic self-healing technique that showed promising results in sealing microcracks through microbial-induced calcite precipitation (MICP) ( 9 – 11 ). The main components of the self-healing process by MICP are the bacterial spores, the type of organic precursor, the efficiency of the nutrients, and a source of calcium ions ( 11 ).…”

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confidence: 99%