Evaluation of Portland and Pozzolanic cement on the self-healing of mortars with calcium lactate and bacteria

González, Ana Marta; Parraguez, Araceli; Corvalán, Liliana; Correa, N. Mariano; Castro, Javier; Stuckrath, Claudia; González, Marcelo

doi:10.1016/j.conbuildmat.2020.119558

Cited by 38 publications

(8 citation statements)

References 28 publications

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“…Added carbon sources are the primary source of nutrients for bacteria in the produced concrete, and finally they become dormant for a long period of time as the nutrients are depleted. Self-healing of cracks is not efficient by the addition of bacteria alone; it is more prominent when calcium lactate is used as a biomineral precursor [ 39 , 40 ]. To solve the dehydration problem hydrogel acts as a water tank for the continuous crack healing process [ 16 ].…”

Section: Microbial Construction Materialsmentioning

confidence: 99%

Bacterial Performance in Crack Healing and its Role in Creating Sustainable Construction

Alemu

Demiss

Korsa

2022

International Journal of Microbiology

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Building practices began with human civilization. Cement is the most commonly used building construction material throughout the world. These traditional building materials have their own environmental impact during production, transportation, and construction, but also have limitations on building quality and cost. Biological construction materials are currently emerging technology to combat emissions from the construction sector. Different civil and biotechnology researchers have turned to microorganisms for the production of bio construction materials that are environmentally friendly, socially acceptable, and economically feasible but can also produce high strength. Scanning electron microscope (SEM) and X-Ray diffraction (XRD) are the most characterization methods used to observe and ensure the production of calcite precipitate as bacterial concrete. As compared to conventional concrete, bacterial concrete was greater by 35.15% in compressive strength, 24.32% in average tensile strength, and 17.24% in average flexural strength, and it was 4 times lower in water absorption and 8 times lower in acid resistivity than conventional concrete. Genetic engineering has great potential to further enhance the mechanical strength of bacterial concrete for use in crack repairs in existing buildings.

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Section: Microbial Construction Materialsmentioning

confidence: 99%

Bacterial Performance in Crack Healing and its Role in Creating Sustainable Construction

Alemu

Demiss

Korsa

2022

International Journal of Microbiology

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“…Therefore, the further anhydrous cement grains´ hydration and the calcium hydroxide carbonation are the main mechanisms for its development. In the autonomous self-healing, different methodologies can promote the cracks healing or sealing, such as: crystalline admixtures (ARNDT, 2019;BORG et al, 2018;CUENCA;TEJEDOR;FERRARA, 2018;ROIG-FLORES et al, 2015), superabsorbent polymers (SILVA, 2018; SNOECK; PEL; DE BELIE, 2020), microorganisms (DA SILVA et al, 2015;; ERŞAN et al, 2018;GONZÁLEZ et al, 2020), vascular networks (MINNEBO et al, 2017SELVARAJOO et al, 2020), and fibers (BULLER et al, 2019;MORETTI, 2016;NISHIWAKI et al, 2012;ZHANG;MA, 2014). Lastly, the repair is called the external action produced in the finished matrix to promote the crack healing, for example, crystalline admixture as a surface treatment (CAPPELLESSO, 2016), and microorganism compounds (DE MUYNCK;VERSTRAETE, 2009).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Calcium hydroxide influence in autogenous self-healing of cement-based materials in various environmental conditions

et al. 2021

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Several factors, such as chemical shrinkage or environmental attack can produce concrete cracks. Calcium hydroxide content from the environment or cement hydration can promote the self-healing phenomenon (SHP). This study evaluates the calcium hydroxide concentration influence on the self-healing phenomenon of cement-based materials. Cracked mortars with different types of cement, such as a filler, pozzolanic, and high initial strength, were exposed to four environmental conditions. Titration was the method proposed to determine the amount of calcium hydroxide content leached in the water, and the cracks closure were analyzed by optical microscopy. CPII F (Portland Cement, type II, compound with limestone) samples showed no trend to Ca(OH)2 leached, and to superficial cracking closure. Regarding CPV (Portland cement, type V, high initial strength cement) samples, their behavior showed the highest Ca(OH)2 content to all environmental exposure, and cracking closure to samples in submerged condition. Thus, a significant influence in the cracks´ closure regarding the presence of Ca2+ leached to the exposure environments, and a water source related to this behavior seems to be a primary factor to improve the SHP.

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“…The compressive strength and water penetration of bio concrete with Enterococcus faecalis and Bacillus sp with the addition of calcium lactate were investigated by Irwan et al The results of their study show that adding calcium lactate and bacteria to concrete improves the strength and durability of the concrete [22][23][24][25][26][27]. Bacteria must be able to maintain a high pH environment in concrete and produce a large amount of CaCO3 in the presence of calcium sources or organic nutrients such as calcium lactate, calcium acetate, calcium glutamate, calcium chloride, and urea [28][29][30]. However, Sahoo et al utilise Bacillus Sphaericus in their study to improve cement mortar properties such as compressive strength, and sorptivity.…”

Section: Introductionmentioning

confidence: 99%

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

El-Mahdy

Elshami

El-Shikh

et al. 2021

Frattura Ed Integrità Strutturale

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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.

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Evaluation of Portland and Pozzolanic cement on the self-healing of mortars with calcium lactate and bacteria

Cited by 38 publications

References 28 publications

Bacterial Performance in Crack Healing and its Role in Creating Sustainable Construction

Bacterial Performance in Crack Healing and its Role in Creating Sustainable Construction

Calcium hydroxide influence in autogenous self-healing of cement-based materials in various environmental conditions

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

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