Undrained cyclic triaxial testing on sand with non-plastic fines content cemented with microbially induced CaCO3

Sasaki, T.; Kuwano, Reiko

doi:10.1016/j.sandf.2016.04.014

Cited by 62 publications

(17 citation statements)

References 31 publications

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“…The CaCO 3 crystals made the surface rougher and that enhanced bonding between sand particles. Sasaki and Kuwano [24] used Sporosarcina pasteurii to consolidate sands with different non-plastic fines content. They found that presence of fines content greatly reduced liquefaction resistance after MICP due to smaller void ratio, formation of smaller and unevenly distributed CaCO 3 .…”

Section: Hcomentioning

confidence: 99%

Insights into the Current Trends in the Utilization of Bacteria for Microbially Induced Calcium Carbonate Precipitation

et al. 2020

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Nowadays, microbially induced calcium carbonate precipitation (MICP) has received great attention for its potential in construction and geotechnical applications. This technique has been used in biocementation of sand, consolidation of soil, production of self-healing concrete or mortar, and removal of heavy metal ions from water. The products of MICP often have enhanced strength, durability, and self-healing ability. Utilization of the MICP technique can also increase sustainability, especially in the construction industry where a huge portion of the materials used is not sustainable. The presence of bacteria is essential for MICP to occur. Bacteria promote the conversion of suitable compounds into carbonate ions, change the microenvironment to favor precipitation of calcium carbonate, and act as precipitation sites for calcium carbonate crystals. Many bacteria have been discovered and tested for MICP potential. This paper reviews the bacteria used for MICP in some of the most recent studies. Bacteria that can cause MICP include ureolytic bacteria, non-ureolytic bacteria, cyanobacteria, nitrate reducing bacteria, and sulfate reducing bacteria. The most studied bacterium for MICP over the years is Sporosarcina pasteurii. Other bacteria from Bacillus species are also frequently investigated. Several factors that affect MICP performance are bacterial strain, bacterial concentration, nutrient concentration, calcium source concentration, addition of other substances, and methods to distribute bacteria. Several suggestions for future studies such as CO2 sequestration through MICP, cost reduction by using plant or animal wastes as media, and genetic modification of bacteria to enhance MICP have been put forward.

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Section: Hcomentioning

confidence: 99%

Insights into the Current Trends in the Utilization of Bacteria for Microbially Induced Calcium Carbonate Precipitation

et al. 2020

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“…[53]- [55] conducted series of undrained cyclic triaxial test on sand cemented through microbial induced calcite precipitate. The liquefaction resistance was evaluated by comparing the cyclic stress ratio with the number of cycles needed to cause 5% double amplitude axial strain for treated and untreated sand.…”

Section: Effect Of Micp On the Cyclic Response Of Soilmentioning

confidence: 99%

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

2018

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Recently, the concept of using biological process in soil improvement otherwise called bio-mediated soil improvement technique has shown greater prospects in the mitigation of liquefiable soils. It is an environmental friendly technique that has generated great interest to geotechnical engineers. This paper presents a review on the microorganism responsible for the biological processes in soil improvement system, factors that affect biological process, identifying the mechanism of liquefaction and commonly adopted method to mitigate liquefaction. Next, the effect of microbial induced calcite precipitation (MICP) on the strength and cyclic response were also analyzed, where it was identified that higher cementation level leads to formation of larger sized calcite crystals which in turn leads to the improved shear strength, stiffness and cyclic resistance ratio of the soil. However, the effects of various bacteria, cementation reagent concentrations amongst other factors were not fully explored in most of the studies. Finally, some of the challenges that lay ahead for the emerging technology are optimizing treatment factors (bacteria and cementation reagent concentration), upscaling process, training of researchers/technologist and long – time durability of the improved soils.

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“…Biocementation of plastic soils would be much more difficult and expensive than sand (Ivanov et al 2015). For example, Sasaki and Kuwano (2016) found that silica sand with a 30% clay fraction showed no increase in cyclic resistance following microbial precipitation of CaCO 3 . Mahawish et al (2018) investigated the effect of grain-size distribution on the efficacy of biocementation of granular columns and found that adding fine to coarse aggregate provides more bridging contacts between coarse aggregate particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of relative density and biocementation on cyclic response of calcareous sand

et al. 2019

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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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Undrained cyclic triaxial testing on sand with non-plastic fines content cemented with microbially induced CaCO3

Cited by 62 publications

References 31 publications

Insights into the Current Trends in the Utilization of Bacteria for Microbially Induced Calcium Carbonate Precipitation

Insights into the Current Trends in the Utilization of Bacteria for Microbially Induced Calcium Carbonate Precipitation

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

Effect of relative density and biocementation on cyclic response of calcareous sand

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