Characterization of contact properties in biocemented sand using 3D X-ray micro-tomography

Dadda, Abdelali; Geindreau, Christian; Emeriault, Fabrice; Roscoat, Sabine Rolland Du; Filet, Annette Esnault; Garandet, Aurélie

doi:10.1007/s11440-018-0744-4

Cited by 48 publications

(21 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Most of the biocementation studies previously conducted with MICP treatment have focused on optimising the recipe by altering the bio-chemical parameters (type of injection, flow rate, concentration of chemicals, ratio of chemical concentrations, density of bacterial population) 22 – 27 however, more recently, the base material’s intrinsic properties have been receiving increased attention 28 – 30 . Careful adjustment of both the bio-chemical parameters and the properties of the base material are needed to meet the requirements of each application.…”

Section: Introductionmentioning

confidence: 99%

The role of bacterial urease activity on the uniformity of carbonate precipitation profiles of bio-treated coarse sand specimens

Konstantinou

Wang

Biscontin

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Protocols for microbially induced carbonate precipitation (MICP) have been extensively studied in the literature to optimise the process with regard to the amount of injected chemicals, the ratio of urea to calcium chloride, the method of injection and injection intervals, and the population of the bacteria, usually using fine- to medium-grained poorly graded sands. This study assesses the effect of varying urease activities, which have not been studied systematically, and population densities of the bacteria on the uniformity of cementation in very coarse sands (considered poor candidates for treatment). A procedure for producing bacteria with the desired urease activities was developed and qPCR tests were conducted to measure the counts of the RNA of the Ure-C genes. Sand biocementaton experiments followed, showing that slower rates of MICP reactions promote more effective and uniform cementation. Lowering urease activity, in particular, results in progressively more uniformly cemented samples and it is proven to be effective enough when its value is less than 10 mmol/L/h. The work presented highlights the importance of urease activity in controlling the quality and quantity of calcium carbonate cements.

show abstract

Section: Introductionmentioning

confidence: 99%

The role of bacterial urease activity on the uniformity of carbonate precipitation profiles of bio-treated coarse sand specimens

Konstantinou

Wang

Biscontin

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…For this, visual inspection and continuous monitoring of the eroding specimen are necessary. The second caveat is the fact that both studies still resort to the CaCO 3 content as the ultimate parameter defining the erosion behaviour of soils, despite existing evidence pointing towards a dependency between CaCO 3 microstructure and macromechanical response (Dadda et al, 2019;Terzis & Laloui, 2018;Wang, 2018). To this end, this study aimed to characterise the effect of different CaCO 3 crystal sizes and distributions-resulting from varying urea-CaCl 2 solution concentrations-on the surface erosion behaviour of fine sand.…”

Section: Introductionmentioning

confidence: 99%

Flume study on the effects of microbial induced calcium carbonate precipitation (MICP) on the erosional behaviour of fine sand

2021

View full text Add to dashboard Cite

DisclaimerThe AM is yet to be copyedited and formatted in journal house style but can still be read and referenced by quoting its unique reference number, the digital object identifier (DOI). Once the AM has been typeset, an 'uncorrected proof' PDF will replace the 'accepted manuscript' PDF. These formatted articles may still be corrected by the authors. During the Production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal relate to these versions also. Version of recordThe final edited article will be published in PDF and HTML and will contain all author corrections and is considered the version of record. Authors wishing to reference an article published Ahead of Print should quote its DOI. When an issue becomes available, queuing Ahead of Print articles will move to that issue's Table of Contents. When the article is published in a journal issue, the full reference should be cited in addition to the DOI.

show abstract

“…Different studies have been performed to explore the increase of the mechanical strength of the soils treated by MICP. These studies show a significant increase in shear strength of bio-mediated soils, where the calcite precipitates preferentially at the inter-granular contacts [4] which increases the amount of the cohesive contact surface between grains, thus the cohesion and the strength of the soil. Soletanche Bachy holds several patents for implementing the process at industrial scale, based on the use of non-pathogenic bacteria in a natural environment [5].…”

Section: Biocalcification Principlementioning

confidence: 91%

BOREAL, Bio-reinforcement of embankments by biocalcification

Filet¹,

Gutjahr²,

Garandet³

et al. 2020

E3S Web Conf.

Self Cite

View full text Add to dashboard Cite

Biocalcification is a recent in-situ soil consolidation solution. It is obtained by calcite precipitation under controlled biogeochemical conditions. The industrial process, for whose implementation Soletanche Bachy holds several patents, has been validated by several experiments, initially on laboratory scale and later in situ on industrial scale under static groundwater conditions. However, it was necessary to adjust the process to make it effective for use in embankments due to the potentially high ground water flows that may be present. This is one of the main aspects addressed by the BOREAL project (Bio-reinforcement of backfilled hydraulic structures), a 4-year research and development program. Injection tests performed on a 1:1 scale in a physical model allowed for the validation of the process’ feasibility in various soil types and configurations as well as under several hydraulic flow conditions. The prime objective of the process is to help mitigate erosion and liquefaction risks. The project’s results are applicable to saturated and non-saturated soils. The areas of application of the process and its objectives in terms of treatment are also discussed in the article.

show abstract

Characterization of contact properties in biocemented sand using 3D X-ray micro-tomography

Cited by 48 publications

References 25 publications

The role of bacterial urease activity on the uniformity of carbonate precipitation profiles of bio-treated coarse sand specimens

The role of bacterial urease activity on the uniformity of carbonate precipitation profiles of bio-treated coarse sand specimens

Flume study on the effects of microbial induced calcium carbonate precipitation (MICP) on the erosional behaviour of fine sand

BOREAL, Bio-reinforcement of embankments by biocalcification

Contact Info

Product

Resources

About