Performance studies on rate of self healing in bio concrete

Durga, Chereddy Sonali Sri; Nerella, Ruben; Madduru, Sri Rama Chand; Venkatesh, Chava

doi:10.1016/j.matpr.2019.09.151

Cited by 33 publications

(13 citation statements)

References 18 publications

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“…La autocuración del concreto se activa por sí sola al presentarse las grietas [14]. El mecanismo de autocuración ha desarrollado una de las mejores técnicas para rellenar las grietas hasta ahora, en la que se utilizan bacterias como agente autocurativo en la mezcla de concreto o en el mortero de cemento [15]. En otras palabras, el concreto autocurativo podría representar una solución atractiva para mitigar el agrietamiento, aumentar la durabilidad y, por lo tanto, contribuir a disminuir los problemas ambientales relacionados con la producción y reparación del concreto además disminuir los costes en reparación de las estructuras [16], [17].…”

Section: Introductionunclassified

Influencia de las bacterias en la autocuración del concreto

Pérez¹,

Carlos-Sánchez²,

Peralta-Sánchez³

2023

Rev. UIS ing.

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El presente documento contempla una reflexión crítica de los avances tecnológicos en ensayos biológicos y químicos que es sometido el concreto mediante la incorporación de bacterias, con el objetivo de conocer los distintos elementos microbianos que poseen propiedades de biomineralización capaces de realizar la autocuración en el concreto, asimismo, se revisaron métodos y aplicaciones de las bacterias en el concreto con el fin de mejorar sus propiedades mecánicas a las diferentes exigencias sometidas las estructuras modernas, y al mismo tiempo contribuir con la reducción de gases dañinos al medio ambiente. En el desarrollo de este manuscrito se revisaron 80 artículos indexados entre los años 2017 al 2021 distribuidos de la siguiente manera, 51 en Scopus, 17 en Ebsco, y 12 en SciencieDirect, señalando y describiendo que el concreto microbiano tiene un enfoque prometedor en un futuro cercano. Los resultados alcanzados con la incorporación de las diferentes bacterias de Bacillus, como son Bacillus subtillis, B, cohnii, B. pasteurii, B. pseudofirmus, B. megaterium entre otros, en diferentes concentraciones de células/ml., mostraron gran efectividad en la cicatrización de grietas, aumentando también la resistencia a la compresión, flexión y tracción en el concreto. Sobre la base de la revisión literaria se concluye que la precipitación microbiana de carbonato de calcio mediante ureólisis en la matriz del concreto, mitiga el agrietamiento, mejora la resistencia, aumenta la durabilidad y, por lo tanto, disminuye los costes en reparación de las estructuras.

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Section: Introductionunclassified

Influencia de las bacterias en la autocuración del concreto

Pérez¹,

Carlos-Sánchez²,

Peralta-Sánchez³

2023

Rev. UIS ing.

View full text Add to dashboard Cite

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“…Furthermore, the inclusion of Bacillus pasteurii into concretes increased the compressive strength, durability, and resistance to freeze–thaw of samples due to calcite precipitation. Moreover, the water absorption and chloride permeability of bio-concrete reduced because of the precipitated calcite-filled cracks/voids [ 22 , 23 ]. Concrete compressive and flexural strengths were enhanced by 28% using Bacillus subtilis bacteria [ 21 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the water absorption and chloride permeability of bio-concrete reduced because of the precipitated calcite-filled cracks/voids [ 22 , 23 ]. Concrete compressive and flexural strengths were enhanced by 28% using Bacillus subtilis bacteria [ 21 , 23 ]. Similarly, the addition of Bacillus megaterium and Bacillus pasteurii (10 −5 cells/mL) to concrete boosted its compressive and flexural strength up to 24% owing to the creation of calcite, which filled voids and prevented the entry of toxic chemicals into the structure [ 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Self-Healing Mortars with and without Bagasse Ash at Pre- and Post-Crack Times

et al. 2022

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Cracks in typical mortar constructions enhance water permeability and degrade ions into the structure, resulting in decreased mortar durability and strength. In this study, mortar samples are created that self-healed their cracks by precipitating calcium carbonate into them. Bacillus subtilus bacterium (10−7, 10−9 cells/mL), calcium lactate, fine aggregate, OPC-cement, water, and bagasse ash were used to make self-healing mortar samples. Calcium lactates were prepared from discarded eggshells and lactic acid to reduce the cost of self-healing mortars, and 5% control burnt bagasse ash was also employed as an OPC-cement alternative. In the presence of moisture, the bacterial spores in mortars become active and begin to feed the nutrient (calcium lactate). The calcium carbonate precipitates and plugs the fracture. Our experimental results demonstrated that cracks in self-healing mortars containing bagasse ash were largely healed after 3 days of curing, but this did not occur in conventional mortar samples. Cracks up to 0.6 mm in self-healing mortars were filled with calcite using 10−7 and 10−9 cell/mL bacteria concentrations. Images from an optical microscope, X-ray Diffraction (XRD), and a scanning electron microscope (SEM) were used to confirm the production of calcite in fractures. Furthermore, throughout the pre- and post-crack-development stages, self-healing mortars have higher compressive strength than conventional mortars. The precipitated calcium carbonates were primed to compact the samples by filling the void spaces in hardened mortar samples. When fissures developed in hardened mortars, bacteria became active in the presence of moisture, causing calcite to precipitate and fill the cracks. The compressive strength and flexural strength of self-healing mortar samples are higher than conventional mortars before cracks develop in the samples. After the healing process of the broken mortar parts (due to cracking), self-healing mortars containing 5% bagasse ash withstand a certain load and have greater flexural strength (100 kPa) than conventional mortars (zero kPa) at 28 days of cure. Self-healing mortars absorb less water than typical mortar samples. Mortar samples containing 10−7 bacteria cells/mL exhibit greater compressive strength, flexural strength, and self-healing ability. XRD and SEM were used to analyze mortar samples with healed fractures. XRD, FTIR, and SEM images were also used to validate the produced calcium lactate. Furthermore, the durability of mortars was evaluated using DTA-TGA analysis and water absorption tests.

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“…There is an optimum concentration of bacteria that shows a positive effect on the compressive strength of bacterial concrete with fly ash, and it is reported to be 10 5 cells/mL for Sporoscarcina pasteurii bacteria [48]. Studies show that the direct inclusion of bacteria, that is, without immobilization or encapsulation, improved compressive strength in the range of 15-32% [49,50], flexural strength by 11% [49], and split tensile strength by 14-16% [49,50]. The immobilization and encapsulation of bacteria are known to improve the self-healing efficiency of concrete [51].…”

Section: Introductionmentioning

confidence: 99%

Cradle-to-Gate Life Cycle and Economic Assessment of Sustainable Concrete Mixes—Alkali-Activated Concrete (AAC) and Bacterial Concrete (BC)

et al. 2021

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The negative environmental impacts associated with the usage of Portland cement (PC) in concrete induced intensive research into finding sustainable alternative concrete mixes to obtain “green concrete”. Since the principal aim of developing such mixes is to reduce the environmental impact, it is imperative to conduct a comprehensive life cycle assessment (LCA). This paper examines three different types of sustainable concrete mixes, viz., alkali-activated concrete (AAC) with natural coarse aggregates, AAC with recycled coarse aggregates (RCA), and bacterial concrete (BC). A detailed environmental impact assessment of AAC with natural coarse aggregates, AAC with RCA, and BC is performed through a cradle-to-gate LCA using openLCA v.1.10.3 and compared versus PC concrete (PCC) of equivalent strength. The results show that transportation and sodium silicate in AAC mixes and PC in BC mixes contribute the most to the environmental impact. The global warming potential (GWP) of PCC is 1.4–2 times higher than other mixes. Bacterial concrete without nutrients had the lowest environmental impact of all the evaluated mixes on all damage categories, both at the midpoint (except GWP) and endpoint assessment levels. AAC and BC mixes are more expensive than PCC by 98.8–159.1% and 21.8–54.3%, respectively.

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Performance studies on rate of self healing in bio concrete

Cited by 33 publications

References 18 publications

Influencia de las bacterias en la autocuración del concreto

Influencia de las bacterias en la autocuración del concreto

Investigation of Self-Healing Mortars with and without Bagasse Ash at Pre- and Post-Crack Times

Cradle-to-Gate Life Cycle and Economic Assessment of Sustainable Concrete Mixes—Alkali-Activated Concrete (AAC) and Bacterial Concrete (BC)

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