Impact of Bacillus subtilis bacterium on the properties of concrete

Jena, Sudipta; Basa, B.; Panda, K. C.; Sahoo, Naresh Kumar

doi:10.1016/j.matpr.2020.03.129

Cited by 45 publications

(14 citation statements)

References 40 publications

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“…In addition, this application is expected to prevent premature cracking of concrete by producing minerals by microbial activity in The parameters and levels presented in Table 1 are adopted from several studies. SHC research conducted by Jena et al [8] used Bacillus subtilis bacteria with concentrations of 10 2 -10 6 cells/ml and conducted compressive strength testing on 7, 14, and 28 days. The bacteria are applied to the concrete encapsulated using gelatin.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Self-Healing Concrete Parameters using Experimental Design Taguchi Method

Abdurrahman

Putra

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The development of self-healing concrete (SHC) is intensively implemented to improve stability and reduce maintenance costs. However, the experiments require many parameter variations, increasing the cost. Taguchi methods are used in experimental design to obtain variations of the optimal parameters and reduce the cost of the experiment. The stages of this study are secondary data collection of the increase of compressive strength, testing Taguchi methods, determining contribution parameters using ANOVA, and developing the estimated model. The parameters analyzed consist of the type, the concentration, the application of bacteria, and the curing time conducted as experimental analysis of 2, 3, and 4 parameters. The results of the parameter analysis using the Taguchi have optimal variation results in a row Bacillus subtilis, 105 cells /ml, encapsulation methods, and 28 days. Bacterial concentrations have a very significant value with contributions of 82.94%, 78.90%, and 74.36% in the analysis of 2, 3, and 4 parameters, respectively. The slightest error value was obtained in the analysis of the 3-parameter experiment with a value of 2.99%. SHC modelling obtained two equations consisting of direct mixing and encapsulation, which have a coefficient of determination of 0.89 and 0.82.

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Section: Introductionmentioning

confidence: 99%

Optimization of Self-Healing Concrete Parameters using Experimental Design Taguchi Method

Abdurrahman

Putra

2022

IOP Conf. Ser.: Earth Environ. Sci.

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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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“…Bacillus megaterium [8,9] and Bacillus sphaericus [10] and the non-ureolytic Bacillus cohnii [11] and Bacillus subtilis [12,13] are some of the -species that have been used. Bacteria are often introduced into the samples in a liquid medium containing the cells at the desired concentration along with nutrients and growth components like nitrogen, carbon and calcium sources [7].…”

Section: Introductionmentioning

confidence: 99%

“…This replaces the mixing water or part of it [10,12] in mortar samples. Curing of bacterial mortar samples in a similar nutrient solution is also common practice in the above-mentioned studies, although water curing has also been applied [9,13]. Despite differences in methods, the above-mentioned studies have recorded increases in strength varying from 17% [5] to 49% [11] after 28 days of curing in bacterial mortars when compared to mortars without bacteria.…”

Section: Introductionmentioning

confidence: 99%

“…It has generally been assumed that MICP is responsible for this phenomenon. MICP was even considered as the driving mechanism for increased strength in studies where nutrients were not provided, and water was used instead of a nutrient liquid medium for introducing the cells into the mortar and for curing the samples [9,[13][14][15][16]. However, this interpretation is not consistent with the knowledge that MICP requires bacterial metabolism, which is unable to take place without nutrients.…”

Section: Introductionmentioning

confidence: 99%

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Incorporation of bacteria in concrete: The case against MICP as a means for strength improvement

Skevi

Reeksting

Hoffmann

et al. 2021

Cement and Concrete Composites

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Impact of Bacillus subtilis bacterium on the properties of concrete

Cited by 45 publications

References 40 publications

Optimization of Self-Healing Concrete Parameters using Experimental Design Taguchi Method

Optimization of Self-Healing Concrete Parameters using Experimental Design Taguchi Method

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

Incorporation of bacteria in concrete: The case against MICP as a means for strength improvement

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