Relevant bibliographies by topics / Biocementation

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Biocementation'

Author: Grafiati
Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Biocementation"

1

Khodadadi Tirkolaei, Hamed, Neda Javadi, Vinay Krishnan, Nasser Hamdan, and Edward Kavazanjian. "Crude Urease Extract for Biocementation." Journal of Materials in Civil Engineering 32, no. 12 (December 2020): 04020374. http://dx.doi.org/10.1061/(asce)mt.1943-5533.0003466.

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2

Muhammed, Abubakar Sadiq, Khairul Anuar Kassim, Muttaqa Uba Zango, Kamarudin Ahmad, and Jodin Makinda. "Effect of Palm Oil Fuel Ash on the Strength and Ammonium By-Product Removal of Biocemented Sandy Soil." Materials Science Forum 1030 (May 2021): 103–9. http://dx.doi.org/10.4028/www.scientific.net/msf.1030.103.

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Enzyme induced calcite precipitation (EICP) or biocementation has rapidly evolved in the last decade as an environmentally friendly ground improvement technique. In EICP, plant-derived urease enzyme is used to trigger the hydrolysis of urea in the presence of calcium ions to produce calcium carbonate (CaCO3) precipitate within the soil matrix. Despite the advancement in soil improvement technology via biocementation, there are still concerns about the fate of the ammonium produced as one of the by-products. Therefore, this study performed an experimental investigation to ascertain that using palm oil fuel ash (POFA) might reduce the amount of ammonia produced as a result of biocementation. The soil was mixed with POFA at different percentages (1, 2, 3, 4 and 5%) by dry weight of the soil. The effectiveness of the treatment process was evaluated by conducting the unconfined compressive strength (UCS) and the ammonium removal efficiency. Results show that the strength and ammonium removal efficiency of the biocemented soil decreased and increased, respectively, with an increase in the percentage of POFA. The highest UCS of 161 kPa was obtained at 3% POFA content, while the lowest concentration of ammonium of 0.71 mg/L was at 5% POFA content.
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3

Safdar, M. U., M. Mavroulidou, M. J. Gunn, D. Purchase, I. Payne, and J. Garelick. "Electrokinetic biocementation of an organic soil." Sustainable Chemistry and Pharmacy 21 (June 2021): 100405. http://dx.doi.org/10.1016/j.scp.2021.100405.

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4

Sharma, Meghna, Neelima Satyam, and Krishna R. Reddy. "Hybrid bacteria mediated cemented sand: Microcharacterization, permeability, strength, shear wave velocity, stress-strain, and durability." International Journal of Damage Mechanics 30, no. 4 (January 28, 2021): 618–45. http://dx.doi.org/10.1177/1056789521991196.

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Microbially induced calcite precipitation (MICP), a sustainable approach for sand biocementation, was investigated in previous studies based on metabolic activity of individual microorganisms. The individual bacteria, specifically Sporosarcina pasteurii (SP), Bacillus subtilis (BS), and Lysinibacillus sphaericus (LS), were found capable enough for sand biocementation. However, present study investigates synergistic effects of using bacterial-hybrids on cementation and consequent improvement in sand properties. The SP, BS, and LS strains were used in different combinations to create bacterial-hybrids and applied under simulated non-sterile field conditions. Initially, sand biotreatment was carried out in plastic tubes up to 14 days, using bacterial mixtures and 0.5 M cementation solution. Biocemented specimens were tested for calcite precipitation, XRD, FTIR, and SEM. The SP and LS combination (SPLS hybrid) showed maximum calcite precipitation, which is further used for biotreatment to create cylindrical sand samples for testing improved engineering properties. These samples were prepared using 0.5 M cementation solution in three pore volumes (1, 0.75, and 0.5 PV) and treatment cycles (12, 24, and 48 hrs TC) up to 18 days. Biocemented samples were tested for permeability (6th, 12th, and 18th days of biotreatment), unconfined compressive strength (UCS), split tensile strength (STS), ultrasonic pulse velocity (UPV), and consolidated undrained stress-strain response. Durability of biocementation was also investigated by determining reduction in strength and UPV subjected to freeze-thaw (FT) cycles (5, 10, 15, and 20). The results showed maximum UCS of 1902 kPa, STS of 356 kPa, UPV of 2408 m/s, and coefficient of permeability reduction up to 91%. The higher results were achieved with 11.11% calcite content in 1PV-12TC treated samples. The 1PV-12TC treated samples resulted in 4.2%, 8.3%, 17%, and 35% reduction of strength after 5, 10, 15, and 20 FT cycles, respectively. Overall, biocementation using hybrid bacteria is shown significant to improve sand's engineering properties, including potential to mitigate liquefaction.
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Dzulkifli, NA, RC Omar, Fathoni Usman, Hairin Taha, and KA Sanusi. "Compressive Strength of Vege-Grout Bricks." International Journal of Engineering & Technology 7, no. 4.35 (November 30, 2018): 516. http://dx.doi.org/10.14419/ijet.v7i4.35.22902.

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Brick is one of largest material used in construction of infrastructure all over the world. A conventional bricks such as clay brick and concrete brick are produced from clay with high temperature kiln firing and from ordinary Portland cement (OPC) concrete respectively. Both of this activities lead to CO2 emission. The burning process requires high temperature at the same time release carbon dioxide and pollute the environment. At present, carbon emissions has become a crucial issues in the society that must be solved. Several studies had demonstrated that brick can be produced from bacteria based on Microbial Induced Calcite Precipitation (MICP). The objective of this study is to develop cement free- brick from vegetables waste with added eggshell as calcium additive to induce biocementation of brick. Brick specimen was cast in the mould size 210 x 90 x 65 mm and casting for 28 days. The study showed that there was an increased in compressive strength up to 0.062 N/mm2 as the curing period increased to 28 days which showed the occurrence of biocementation activities. SEM-EDX analysis confirmed the presence of calcite precipitation. The result indicated that vege-grout can be used as binding agent for biocementation to produce bricks.
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Xiao, Peng, Hanlong Liu, Armin W. Stuedlein, T. Matthew Evans, and Yang Xiao. "Effect of relative density and biocementation on cyclic response of calcareous sand." Canadian Geotechnical Journal 56, no. 12 (December 2019): 1849–62. http://dx.doi.org/10.1139/cgj-2018-0573.

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Microbial-induced calcium carbonate precipitation (MICP) represents a promising approach to improve the geotechnical engineering properties of soils through the precipitation of calcium carbonate (CaCO3) at soil particle contacts and soil particle surfaces. An extensive experimental study was undertaken to investigate the influence of initial relative density on the efficiency of the biocementation process, the reduction of liquefaction susceptibility, and the cyclic response in biocemented calcareous soils. For this purpose, stress-controlled undrained cyclic triaxial shear (CTS) tests were carried out on untreated and MICP-treated calcareous sand specimens for different initial relative densities and magnitudes of biocementation. Improvement in the cyclic response was quantified and compared in terms of excess pore pressure generation, evolution of axial strains, and the number of cycles to liquefaction. The cyclic experiments show that MICP treatment can change the liquefaction failure mechanism from flow failure to cyclic mobility and can significantly change the excess pore pressure generation response of initially loose specimens. Scanning electron microscope (SEM) images indicate the CaCO3 crystals alter the characteristics of the sand particles and confirm the physical change in soil fabric that impacts the dynamic behavior and liquefaction resistance of MICP-treated specimens. Furthermore, the effect of biocementation was contrasted against the effect of relative density alone, and MICP treatment was shown to exhibit greater efficiency in improving the cyclic resistance than densification.
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Udymovych, V. "General characteristic of biocementation and control parameters." Scientific Works of National University of Food Technologies 27, no. 6 (December 2021): 30–42. http://dx.doi.org/10.24263/2225-2924-2021-27-6-5.

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8

Jaya Sri, V., and Anuja Charpe. "Strength Enhancement of Mortar using Biocementation Technique." IOP Conference Series: Earth and Environmental Science 982, no. 1 (March 1, 2022): 012028. http://dx.doi.org/10.1088/1755-1315/982/1/012028.

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Abstract Biocementation is a technique in which calcium carbonate (CaCO3) gets deposited with the help of ureolytic bacteria. In this study, an attempt has been made to augment the properties of mortar utilizing bacterial solution made with soil bacteria and other nutrients. The consequence of bacterial solution was noticed in two methods. In the first method the bacterial solution is used in preparing the bacterial mortar specimens and in the second method the bacterial solution is used in surface treatment of mortar. Considerable enhancement of 20.08% in compressive strength and 10.52% decrement in water absorption of bacterial mortar over conventional mortar was observed at the end of 56 days of curing period.
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Fattahi, Seyed Mohammad, Abbas Soroush, and Ning Huang. "Biocementation Control of Sand against Wind Erosion." Journal of Geotechnical and Geoenvironmental Engineering 146, no. 6 (June 2020): 04020045. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0002268.

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10

Cardoso, Rafaela, Inês Pires, Sofia O. D. Duarte, and Gabriel A. Monteiro. "Effects of clay's chemical interactions on biocementation." Applied Clay Science 156 (May 2018): 96–103. http://dx.doi.org/10.1016/j.clay.2018.01.035.

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Dissertations / Theses on the topic "Biocementation"

1

au, thassan@iinet net, and Salwa Al Thawadi. "High Strength In-Situ Biocementation of Soil by Calcite Precipitating Locally Isolated Ureolytic Bacteria." Murdoch University, 2008. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20090409.120801.

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This study has contributed to the patented technology of biocement (Microbial Biocementation, WO/2006/066326). Biocementation or biogrout is a sand consolidation technology, in which the carbonate released from microbial urea hydrolysis precipitates with an excess of calcium ions to form in-situ calcite (CaCO3) precipitation. Under the right conditions this can result in soil solidification and has found significant commercial interest. This study has enriched and isolated highly urease active bacteria, particularly suitable for the fermentation process. Six strains with different properties relevant for biocementation were isolated. The most urease active strain (strain MCP11) produced sufficient urease to allow the use of the non-concentrated cell suspension for biocementation experiments. Activities and specific activities were 11-28 mM urea hydrolysed.min-1 and 2.2-5.6 mM urea hydrolysed.min-1.OD-1 respectively. A separate strain (strain MCP4) showed spontaneous flocculation at the end of the batch growth, showing its increased tendency to attach to surfaces. This can be useful for effective cell concentration and for improved attachment during the cementation process. The possibility of causing cementation by using enrichments rather than pure strains has been documented. This may allow a cheaper production of the urease than by traditional pure culture processes. Urease production was optimised by increasing the concentration of yeast extract and the addition of Ni2+ ions to the growth media, resulting in increasing urease activity as the reproducible urease yield. This was accomplished by the addition of 10 ¦ÌM Ni 2+ ions and increasing the level of yeast extract to 20 g.L-1 Some of the isolated strains were suitable for biocementation process producing mechanical strength (¡Ý0.6 MPa) within several hours depending on the rate of urea conversion. This mechanical strength enhancement of the cemented columns was performed without a large decrease in the permeability. The formation of CaCO3 crystals in the presence of high concentration of calcium and urea was monitored. This crystal growth was monitored over time by video recording the ureolytic reaction on a microscopic slide. The crystals also were examined through SEM. It was found that two types of CaCO3 precipitates were formed; these precipitates were calcite rhombohedral crystals and spheroids. Video clips showed that the rhombohedral crystals originated from the spheroids. These spheroids were fragile, not stable and were considered to be vaterite. This study suggested that the strength of the cemented column was caused mostly due to the point-to-point contacts of rhombohedral CaCO3 crystals and adjacent sand grains. A method of producing high strength cemented samples from sand was developed. This method first attaches the cells into the sand-column by growing them in the presence of calcium ions as little as 6 mM. Then, the cells were incubated in-situ for about 48 hours to enable attachment to the surface of the sand granules. Then the cells were reused over 20-times by continuous supply of cementation solution (equi-molar concentration of calcium and urea). This method produced a mechanical strength of up to 30 MPa, which is equivalent to construction cement. The mechanical strength could be increased by supplying the bacteria in-situ with a food source and 10 ¦ÌM Ni2+ ions, allowing some measures of reaction rate control in-situ. To our knowledge, this study was the first study to use biological cementation to produce strength comparable to that of traditional cemented construction materials such as sandstone and concrete. The key factors for the optimal CaCO3 precipitation (strength production) in-situ were examined. It was found that in-situ urease activity was the key factor for strength production. The maximum in-situ urease activity was achieved by supplementing the cementation solution with growth media, and the use of 0.5 M urea and Ca2+ as cementation solution. The in-situ urease activity differed according to the different bacterial strains which tolerated the cementation conditions differently. One of the advantages of the present study was that cementation of porous media could be achieved without clogging the injection end. The injection end could be clogged by CaCO3 precipitation due to cementation reaction (cells, calcium and urea). By sequentially flushing the cells and cementation solution, clogging of the injection end could be avoided and high penetration depth was achieved as long as there was sufficient passage of cementation solution. Uniform cementation along 1 m packed sand-column was obtained. This uniformity was confirmed by the urease activity measurement, calcite precipitation and mechanical strength production. For finer sand, homogenous cementation proved more difficult.
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2

Al-Thawadi, Salwa M. "High strength in-situ biocementation of soil by calcite precipitating locally isolated ureolytic bacteria /." Murdoch University Digital Theses Program, 2008. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20090409.120801.

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3

Al-Thawadi, Salwa. "High strength in-situ biocementation of soil by calcite precipitating locally isolated ureolytic bacteria." Thesis, Al-Thawadi, Salwa (2008) High strength in-situ biocementation of soil by calcite precipitating locally isolated ureolytic bacteria. PhD thesis, Murdoch University, 2008. https://researchrepository.murdoch.edu.au/id/eprint/721/.

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Abstract:
This study has contributed to the patented technology of biocement (Microbial Biocementation, WO/2006/066326). Biocementation or biogrout is a sand consolidation technology, in which the carbonate released from microbial urea hydrolysis precipitates with an excess of calcium ions to form in-situ calcite (CaCO3) precipitation. Under the right conditions this can result in soil solidification and has found significant commercial interest. This study has enriched and isolated highly urease active bacteria, particularly suitable for the fermentation process. Six strains with different properties relevant for biocementation were isolated. The most urease active strain (strain MCP11) produced sufficient urease to allow the use of the non-concentrated cell suspension for biocementation experiments. Activities and specific activities were 11-28 mM urea hydrolysed.min-1 and 2.2-5.6 mM urea hydrolysed.min-1.OD-1 respectively. A separate strain (strain MCP4) showed spontaneous flocculation at the end of the batch growth, showing its increased tendency to attach to surfaces. This can be useful for effective cell concentration and for improved attachment during the cementation process. The possibility of causing cementation by using enrichments rather than pure strains has been documented. This may allow a cheaper production of the urease than by traditional pure culture processes. Urease production was optimised by increasing the concentration of yeast extract and the addition of Ni2+ ions to the growth media, resulting in increasing urease activity as the reproducible urease yield. This was accomplished by the addition of 10 μM Ni 2+ ions and increasing the level of yeast extract to 20 g.L-1 Some of the isolated strains were suitable for biocementation process producing mechanical strength (≥ 0.6 MPa) within several hours depending on the rate of urea conversion. This mechanical strength enhancement of the cemented columns was performed without a large decrease in the permeability. The formation of CaCO3 crystals in the presence of high concentration of calcium and urea was monitored. This crystal growth was monitored over time by video recording the ureolytic reaction on a microscopic slide. The crystals also were examined through SEM. It was found that two types of CaCO3 precipitates were formed; these precipitates were calcite rhombohedral crystals and spheroids. Video clips showed that the rhombohedral crystals originated from the spheroids. These spheroids were fragile, not stable and were considered to be vaterite. This study suggested that the strength of the cemented column was caused mostly due to the point-to-point contacts of rhombohedral CaCO3 crystals and adjacent sand grains. A method of producing high strength cemented samples from sand was developed. This method first attaches the cells into the sand-column by growing them in the presence of calcium ions as little as 6 mM. Then, the cells were incubated in-situ for about 48 hours to enable attachment to the surface of the sand granules. Then the cells were reused over 20-times by continuous supply of cementation solution (equi-molar concentration of calcium and urea). This method produced a mechanical strength of up to 30 MPa, which is equivalent to construction cement. The mechanical strength could be increased by supplying the bacteria in-situ with a food source and 10 μM Ni2+ ions, allowing some measures of reaction rate control in-situ. To our knowledge, this study was the first study to use biological cementation to produce strength comparable to that of traditional cemented construction materials such as sandstone and concrete. The key factors for the optimal CaCO3 precipitation (strength production) in-situ were examined. It was found that in-situ urease activity was the key factor for strength production. The maximum in-situ urease activity was achieved by supplementing the cementation solution with growth media, and the use of 0.5 M urea and Ca2+ as cementation solution. The in-situ urease activity differed according to the different bacterial strains which tolerated the cementation conditions differently. One of the advantages of the present study was that cementation of porous media could be achieved without clogging the injection end. The injection end could be clogged by CaCO3 precipitation due to cementation reaction (cells, calcium and urea). By sequentially flushing the cells and cementation solution, clogging of the injection end could be avoided and high penetration depth was achieved as long as there was sufficient passage of cementation solution. Uniform cementation along 1 m packed sand-column was obtained. This uniformity was confirmed by the urease activity measurement, calcite precipitation and mechanical strength production. For finer sand, homogenous cementation proved more difficult.
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4

Al-Thawadi, Salwa. "High strength in-situ biocementation of soil by calcite precipitating locally isolated ureolytic bacteria." Al-Thawadi, Salwa (2008) High strength in-situ biocementation of soil by calcite precipitating locally isolated ureolytic bacteria. PhD thesis, Murdoch University, 2008. http://researchrepository.murdoch.edu.au/721/.

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Abstract:
This study has contributed to the patented technology of biocement (Microbial Biocementation, WO/2006/066326). Biocementation or biogrout is a sand consolidation technology, in which the carbonate released from microbial urea hydrolysis precipitates with an excess of calcium ions to form in-situ calcite (CaCO3) precipitation. Under the right conditions this can result in soil solidification and has found significant commercial interest. This study has enriched and isolated highly urease active bacteria, particularly suitable for the fermentation process. Six strains with different properties relevant for biocementation were isolated. The most urease active strain (strain MCP11) produced sufficient urease to allow the use of the non-concentrated cell suspension for biocementation experiments. Activities and specific activities were 11-28 mM urea hydrolysed.min-1 and 2.2-5.6 mM urea hydrolysed.min-1.OD-1 respectively. A separate strain (strain MCP4) showed spontaneous flocculation at the end of the batch growth, showing its increased tendency to attach to surfaces. This can be useful for effective cell concentration and for improved attachment during the cementation process. The possibility of causing cementation by using enrichments rather than pure strains has been documented. This may allow a cheaper production of the urease than by traditional pure culture processes. Urease production was optimised by increasing the concentration of yeast extract and the addition of Ni2+ ions to the growth media, resulting in increasing urease activity as the reproducible urease yield. This was accomplished by the addition of 10 μM Ni 2+ ions and increasing the level of yeast extract to 20 g.L-1 Some of the isolated strains were suitable for biocementation process producing mechanical strength (≥ 0.6 MPa) within several hours depending on the rate of urea conversion. This mechanical strength enhancement of the cemented columns was performed without a large decrease in the permeability. The formation of CaCO3 crystals in the presence of high concentration of calcium and urea was monitored. This crystal growth was monitored over time by video recording the ureolytic reaction on a microscopic slide. The crystals also were examined through SEM. It was found that two types of CaCO3 precipitates were formed; these precipitates were calcite rhombohedral crystals and spheroids. Video clips showed that the rhombohedral crystals originated from the spheroids. These spheroids were fragile, not stable and were considered to be vaterite. This study suggested that the strength of the cemented column was caused mostly due to the point-to-point contacts of rhombohedral CaCO3 crystals and adjacent sand grains. A method of producing high strength cemented samples from sand was developed. This method first attaches the cells into the sand-column by growing them in the presence of calcium ions as little as 6 mM. Then, the cells were incubated in-situ for about 48 hours to enable attachment to the surface of the sand granules. Then the cells were reused over 20-times by continuous supply of cementation solution (equi-molar concentration of calcium and urea). This method produced a mechanical strength of up to 30 MPa, which is equivalent to construction cement. The mechanical strength could be increased by supplying the bacteria in-situ with a food source and 10 μM Ni2+ ions, allowing some measures of reaction rate control in-situ. To our knowledge, this study was the first study to use biological cementation to produce strength comparable to that of traditional cemented construction materials such as sandstone and concrete. The key factors for the optimal CaCO3 precipitation (strength production) in-situ were examined. It was found that in-situ urease activity was the key factor for strength production. The maximum in-situ urease activity was achieved by supplementing the cementation solution with growth media, and the use of 0.5 M urea and Ca2+ as cementation solution. The in-situ urease activity differed according to the different bacterial strains which tolerated the cementation conditions differently. One of the advantages of the present study was that cementation of porous media could be achieved without clogging the injection end. The injection end could be clogged by CaCO3 precipitation due to cementation reaction (cells, calcium and urea). By sequentially flushing the cells and cementation solution, clogging of the injection end could be avoided and high penetration depth was achieved as long as there was sufficient passage of cementation solution. Uniform cementation along 1 m packed sand-column was obtained. This uniformity was confirmed by the urease activity measurement, calcite precipitation and mechanical strength production. For finer sand, homogenous cementation proved more difficult.
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5

Duraisamy, Youventharan. "Strength And Stiffness Improvement Of Bio-Cemented Sydney Sand." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15533.

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This thesis explores the performance of small scale cemented soil columns produced using soil mixing with cement resulting from bacterially mediated reactions that precipitate calcium carbonate, a process often referred to as bio-cementation. Bio-cementation has received considerable research attention over the last decade as it has the potential to complement existing ground improvement techniques and mitigate environmental concerns with currently used materials. Previous research has concentrated on pumping and injection techniques because of concerns that bacteria will be unable to survive the stresses associated with industrial mixing processes, however it has been difficult to create uniform bio-cemented soil masses. In this thesis the ureolytic bacterium, Bacillus Megaterium, not previously reported in bio-cementation studies, has been investigated to determine its viability and efficiency as a microbe for mediating the calcite precipitation. It has been found that the highest hydrolysis rate is recorded when calcium concentrations are double the urea concentrations, and that significant amounts of calcite can be precipitated in a single mixing process. Unconfined compressive strength (UCS) tests and a series of triaxial tests have been conducted to quantify the effects of the bio-cementation on the mechanical response. Bender elements mounted in the triaxial cell have also been used to monitor the shear wave velocity during curing and shearing. The results of mechanical tests on the bio-cemented sand have been compared with tests on gypsum cemented and uncemented specimens. It has been found that bio-cementation by mixing produces homogeneous specimens with similar strengths and stiffnesses to the commonly used flushing or injection technique. To assess the performance of in-situ mixed, 38 mm diameter, bio-cemented sand columns a small scale in-situ mixing technique was used to create the model columns. Foundation tests have been performed at 1-g in a cylindrical tank with diameter of 600 mm. A significant improvement was observed in the response of foundations when placed on bio-cemented columns, and this was similar to the improvement from more conventional gypsum cements. These tests confirmed the feasibility of using an in-situ mixing technique with bio-cementation and provided valuable insight into the factors that must be considered in developing field applications. This thesis also has demonstrated repair strategies and techniques to encourage healing and self-healing should damage occur in foundations. Results from tests performed to investigate the ability of biocement to repair cemented soil columns are reported.
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Rebata-Landa, Veronica. "Microbial Activity in Sediments: Effects on Soil Behavior." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19720.

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Thesis (Ph.D)--Civil and Environmental Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Santamarina, J. Carlos; Committee Member: Burns, Susan; Committee Member: Frost, David; Committee Member: Mitchell, James; Committee Member: Rix, Glenn; Committee Member: Sobecky, Patricia.
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Cuccurullo, Alessia. "EARTH STABILISATION BY PLANT-DERIVED UREASE ENZYME FOR BUILDING APPLICATIONS." Thesis, Pau, 2019. https://tel.archives-ouvertes.fr/tel-03179295.

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Cette étude se concentre sur les performances hygro-mécaniques de la terre crue compactée comme matériau de construction alternatif aux matériaux de construction classiques à forte empreinte énergétique. Les briques en terre ont été fabriquées en appliquant des pressions de compactage élevées (jusqu’à 100 MPa, d’où la dénomination d’hyper-compactage) pour augmenter la densité du matériau et ainsi obtenir des propriétés mécaniques similaires à celles des matériaux de construction traditionnels tels que les briques cuites, les blocs de béton et la terre stabilisée. Une vaste campagne expérimentale a été menée sur des échantillons constitués de différents mélanges hyper-compactés de terres à leur teneur en eau optimale respective. La rigidité et la résistance mécanique ont été mesurées par des essais de compression non confinés et triaxiaux, tandis que l’adsorption/désorption de vapeur a été évaluée par la valeur de MBV (Moisture Buffering Value). La durabilité à l'érosion hydrique a été étudiée en effectuant des tests de adsorption capillaire, d'immersion et de goutte-à-goutte conformément aux normes DIN 18945 (2013) et NZS 4298 (1998). Les résultats ont confirmé que l'hyper-compactage améliore les performances mécaniques de la terre crue compactée, mais qu'une augmentation sensible de l'humidité ambiante pouvait entraîner une réduction considérable de la résistance. Néanmoins, les tests de durabilité ont révélé que la terre compactée non stabilisée ne pouvait pas être utilisée pour la construction des parties de structures exposées aux intempéries naturelles en raison de sa sensibilité vis-à-vis de l’eau liquide. Les expériences ont démontré la dépendance de la résistance, de la rigidité, du comportement hydrique, de la sensibilité à l’eau liquide et de la durabilité à la taille des particules. En particulier, il a été observé qu'un mélange de terre à faible granulométrie et calibrées présentait des caractéristiques pour les propriétés susmentionnées supérieures à celle d’un sol à la granulométrie grossière et non maîtrisée. Un défi important a été l'amélioration de la durabilité de la terre crue à l'érosion hydrique en adoptant de techniques de stabilisation à faibles impacts environnementaux, ce qui a conduit à la mise au point d’une méthode originale de stabilisation basée sur l’utilisation d’extraits de plantes. Cette méthode était conforme à la précipitation de calcite induite par voie enzymatique via l'action de l'enzyme uréase pour catalyser l'hydrolyse de l'urée. Cette réaction produit des ions carbonates, qui réagissent ensuite avec les ions calcium du sol dissout dans l’eau interstitielle pour précipiter sous forme de carbonate de calcium, liant ainsi les particules du sol
The present work investigates the hygro-mechanical performance of compacted earth as an alternative to conventional energy-intensive building materials. Earth bricks were manufactured by applying high compaction pressures up to 100 MPa (hyper-compaction) to increase the density of the earth and hence to obtain mechanical properties that are similar to those of traditional construction materials such as fired bricks, concrete blocks and stabilised earth. A wide campaign of laboratory tests was performed on samples made of different earth mixes that were hyper-compacted at their respective optimum water contents. Stiffness and strength were measured by unconfined and triaxial compression tests while vapour adsorption/desorption was assessed by measuring moisture buffering value (MBV). Durability to water erosion was also evaluated by performing suction, immersion and drip tests according to the norms DIN 18945 (2013) and NZS 4298 (1998), respectively. Results showed that hyper-compaction largely improved the mechanical performance of compacted earth but that a marked increase in ambient humidity could produce a considerable reduction of strength. Durability tests highlighted that the unstabilised compacted earth could not be employed for the construction of structures exposed to natural weathering. The experiments also demonstrated the dependency of strength, stiffness, moisture buffering capacity and water durability on particle grading. In particular, it was shown that a fine and well-graded earth mix exhibited higher levels of strength, stiffness, moisture buffering capacity and durability than a coarse and poorly-graded one. One important challenge lied in the improvement of the earth durability against water erosion by adopting novel stabilisation techniques, which led to the development of an original stabilisation method based on the utilisation of plant extracts. The method was consistent with the principles of Enzymatic Induced Calcite Precipitation (EICP), which utilises the action of the urease enzyme to catalyse the hydrolysis of urea. This reaction produces carbonate ions, which then react with the calcium ions dissolved in the pore water to produce the precipitation of calcium carbonate (i.e. calcite), thus binding the soil together. The novelty of the present work resides in the utilisation of crude plant-derived urease enzyme instead of pure reagent-grade products available from chemical suppliers, which reduces environmental and financial costs. In particular, the urease enzyme was obtained from a liquid soybeans extract, inside which the urea and calcium chloride were subsequently dissolved to induce the precipitation of calcite. Measurements of pH, electrical conductivity and precipitation ratio indicated that the optimum equimolar concentration of urea and calcium chloride (leading to the largest precipitation of calcite) was 2.5 mol/L. An experimental campaign was finally undertaken to implement the proposed bio-stabilisation method into the manufacture of compressed earth bricks. The most promising versions of the proposed bio-stabilisation method were also the object of further investigation to assess the hygro-mechanical behaviour of the stabilised earth by means of unconfined compression and moisture buffering value tests. The findings, although preliminary, suggested that a noticeable improvement of strength and water durability could be achieved by the proposed stabilisation protocol, in spite of the difficulty in replicating exactly quantitative results
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Book chapters on the topic "Biocementation"

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Ivanov, Volodymyr, and Viktor Stabnikov. "Biocementation and Biocements." In Construction Biotechnology, 109–38. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1445-1_7.

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Cardoso, Rafaela, Rita Pedreira, Sofia Duarte, Gabriel Monteiro, Hugo Borges, and Inês Flores-Colen. "Biocementation as Rehabilitation Technique of Porous Materials." In New Approaches to Building Pathology and Durability, 99–120. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0648-7_5.

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Charpe, Anuja U., and M. V. Latkar. "Effect of Biocementation on Concrete using Different Calcium Sources." In Recent Advancements in Civil Engineering, 307–16. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4396-5_28.

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Mori, Deepak, Poonam Jyoti, Tejinder Thakur, Shyam K. Masakapalli, and K. V. Uday. "Influence of Cementing Solution Concentration on Calcite Precipitation Pattern in Biocementation." In Lecture Notes in Civil Engineering, 737–46. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0886-8_59.

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Ivanov, Volodymyr, and Viktor Stabnikov. "Microbially-Mediated Decontamination of CBRN Agents on Land and Infrastructure Using Biocementation." In Functional Nanostructures and Sensors for CBRN Defence and Environmental Safety and Security, 233–44. Dordrecht: Springer Netherlands, 2020. http://dx.doi.org/10.1007/978-94-024-1909-2_17.

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Bhutange, Snigdha P., and M. V. Latkar. "Application of Biocementation for Augmentation of Mechanical Properties of Fly Ash Concrete." In Recent Advancements in Civil Engineering, 245–59. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4396-5_23.

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Moqsud, Azizul. "Landslide Mitigation through Biocementation." In Landslides [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.100271.

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Landslide and other geo-disasters are causing a great damage to people and the resources all over the world. An environment friendly countermeasure of landslide disasters is necessary. Microbially induced calcite precipitation (MICP) is a bio-cementation process that can improve the geotechnical properties of granular soils through the precipitation of calcium carbonate (calcite) at soil particle contacts. This MICP can be an environment friendly solution for the biocementation of soil. In this study, an evaluation of biocemented soil has been carried out through direct shear test and direct simple shear test. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectrometry (EDS) and X-ray Computed Tomography (X-ray CT) tests were conducted to analysis the calcite precipitation inside the biotreated soil by bacteria by using Toyoura sand and silica sand no. 4. It was observed that the amount of calcite generated in silica sand was larger than Toyoura sand. The particle shape influences the result of calcite precipitation and consequent strength of the bio-cemented sand. The amount of strength which was obtained by direct shear test and direct simple shear test indicated the granular soil became bio-stabilized within 7 days of application of nutrients from the surface. However, the amount of generated calcite was not uniformed in different layers while applying the nutrients and bacterial from the surface which was revealed by X-ray CT scan test.
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Mwandira, Wilson, Kazunori Nakashima, and Satoru Kawasaki. "Stabilization/solidification of mining waste via biocementation." In Low Carbon Stabilization and Solidification of Hazardous Wastes, 201–9. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-824004-5.00014-1.

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Gowthaman, Sivakumar, Meiqi Chen, Kazunori Nakashima, Shin Komatsu, and Satoru Kawasaki. "Biocementation technology for stabilization/solidification of organic peat." In Low Carbon Stabilization and Solidification of Hazardous Wastes, 49–64. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-824004-5.00019-0.

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Conference papers on the topic "Biocementation"

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Backes, Jênifer Cristina, André Leão, Julio Cesar Rech, and Aline Schuck Rech. "Biocementation in the production of mortar: the role of biocementation bacteria." In ENSUS 2022 - X Encontro de Sustentabilidade em Projeto. Grupo de Pesquisa VirtuHab/UFSC, 2022. http://dx.doi.org/10.29183/2596-237x.ensus2022.v10.n1.17-28.

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The use of biocementation is a technique widely used in the civil construction to repair pathologies, such as cracks and fissures. This technique is linked to the bacterial activity (urolytic and/or carbonategenic), responsible for the conversion of urea into carbonate, correcting problems in the structure. In this sense, the aim of this study was to identify the main ureolytic bacteria capable of precipitating calcium carbonate in mortar, one of the most widely applied construction areas, as well as to evaluate the performance of each microorganism in changing the physical and mechanical properties of the mortar. For this, a bibliographic search was carried out in the database of Scopus, Scielo, Web of Since, as well as in the academic portal of CAPES. The results show that the main bacteria associated with the mortar biocementation technique is the genus Bacillus sp. Parameters and standards for evaluating the performance of the different bacteria used between the studies were not identified. However, evaluations related to mortar strength were present in the vast majority of researches. The use of biocementation via bacterial activity proved to be an important strategy that promotes improvements in strength, compression, water absorption potential and porosity of the mortar
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Gleaton, J., R. Xiao, Z. Lai, N. McDaniel, C. A. Johnstone, B. Burden, Q. Chen, and Y. Zheng. "Biocementation of Martian Regolith Simulant with In Situ Resources." In 16th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481899.056.

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Albuquerque, D. C., R. Cardoso, G. A. Monteiro, S. O. Duarte, V. C. Martins, and S. Cardoso. "Towards a portable magnetoresistive biochip for urease-based biocementation monitoring*." In 2019 IEEE 6th Portuguese Meeting on Bioengineering (ENBENG). IEEE, 2019. http://dx.doi.org/10.1109/enbeng.2019.8692505.

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Arbabzadeh, Emad, and Rafaela Cardoso. "Efficiency of Biocementation as Rock Joints Sealing Technique Evaluated Through Permeability Changes." In The 4th World Congress on Civil, Structural, and Environmental Engineering. Avestia Publishing, 2019. http://dx.doi.org/10.11159/icgre19.143.

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Roth, Mary J. S., Laurie F. Caslake, and Michael P. McGuire. "Biocementation for All, Anywhere: A New Experiment for Introductory Soil Mechanics Courses." In Geo-Congress 2022. Reston, VA: American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484067.047.

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Rodríguez, Román Fernández, and Rafaela Cardoso. "Relationship between Enzyme Concentration and Carbonate Precipitation in a Sand Treated By Biocementation Using Enzyme." In The 7th World Congress on Civil, Structural, and Environmental Engineering. Avestia Publishing, 2022. http://dx.doi.org/10.11159/icgre22.240.

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Kim, Yumi, and Yul Roh. "Effects of Bacterial Metabolites and Phyllosilicate Minerals on Crack Healing and Biocementation of Sandy Soils in the MICP Process." In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.13242.

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