Effect of Reagents Concentration on Biocementation of Tropical Residual Soil

Chiet, Kenny Tiong Ping; Kassim, Khairul Anuar; Chen, K B; Martula, U; Yah*, Chong Siaw; Arefnia, Ali

doi:10.1088/1757-899x/136/1/012030

Cited by 14 publications

(6 citation statements)

References 22 publications

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“…Results of a study by Umar et al [48], results shows an increase in strength with increase in reagent concentration up to 0.5M after which a decline in strength was noticed at values higher than 0.5M. Similarly, Chiet et al [51] found that the most optimal concentration of cementation reagent is 0.25M for MICP treated residual soil. Al-Qabany et al [52] also found out that lower cementation reagent (lower or equal to 0.25M) gave rise to higher unconfine compressive strength values.…”

Section: Concentration Of Cementation Reagentmentioning

confidence: 91%

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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Section: Concentration Of Cementation Reagentmentioning

confidence: 91%

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

2018

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“…The MICP technique is based on natural processes that require less energy; it can be carried out at ambient temperature, beneath existing structures without disturbing them, and can allow improvement over a large area. Studies [15,20,73,149,189] have also shown that MICP treatment of soil results in a substantial increase in its strength, stiffness, and dilative behavior, resulting in improved geotechnical properties of the soil in order to solve several engineering problems.…”

Section: Advantages Of the Micp Techniquementioning

confidence: 99%

Review of the use of microorganisms in geotechnical engineering applications

et al. 2020

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Until recently, engineers either ignored or neglected the role of microorganisms in geotechnical engineering. The microbially induced calcite precipitation (MICP) research technique is an innovative and relatively green technology which consists in a biological process through which microorganisms react with minerals (calcium source and cementation reagent) to produce calcite (CaCO 3 ) as a byproduct that modifies and improves the engineering properties of soil. Laboratory and field results obtained from various studies are promising and viable, suggesting potential for various engineering applications. This research technique has also been considered to be useful in many engineering applications such as improvement of construction materials, cementation of porous media, improvement in strength and stiffness of engineering soils, hydraulic control of engineering facilities (waste containment), liquefaction, and erosion mitigation. In this review, the various methods of production of calcium carbonates (calcite), the role played by bacteria, various state-of-the-art procedures that have evolved in this research area, as well as ongoing studies are reported. Furthermore, the use of the MICP technique in remediation of contaminants and other environmental concerns is also presented. The advantages and challenges (in form of undesired byproducts) of this research technique are highlighted herein.

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“…The MICP stabilization gained more strength when soaked for hours compared to unsoaked CBR. Increase in CBR might be due to the reaction of bacteria with the cementation reagent to produce calcite, which bind the soil together and fill the void spaces in the granular soil to increase its strength [26,55]. Dejong et al [28] attributed increase in CBR to be due to higher relative density and increased number of contacts per particle within the dense sand, which contributed to the higher CBR value.…”

Section: California Bearing Ratio (Cbr)mentioning

confidence: 99%

“…Authors including [1,2,4,5,7,15,17,26,28,44,46,48,56] amongst others have shown the possibility of using agricultural waste materials, microorganisms and others as additives for soil stabilization. These materials have attracted the attention of researchers because of their low cost and high cementation reaction.…”

Section: Introductionmentioning

confidence: 99%

“…However, the coefficient of consolidation (Cv) showed no observable trend with increased RHA content but generally increased with higher consolidation pressure on the dry and wet side of optimum compacted states. Chiet et al [26] studied the feasibility of Bacillus subtilis and optimum reagents concentration used in microbial induced calcite precipitate (MICP) treatment of tropical residual soil. Measurements of soil shear strength and calcite content was performed and it was discovered that the cementation reagent concentration significantly affected the performance of MICP treatment.…”

Section: Introductionmentioning

confidence: 99%

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Comparative effect of microbial induced calcite precipitate, cement and rice husk ash on the geotechnical properties of soils

Oyediran

Ayeni

2020

SN Appl. Sci.

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This study presents experimental results of the investigation into the comparative effects of up to 15% by volume of microbial induced calcite precipitate (MICP), cement and rice husk ash (RHA) on the geotechnical properties of soils compacted at optimum molding water content (OMC) of the modified AASHTO (MA) energy level. This was with a view to determine the additive with the greatest positive influence in terms of improvement and possibly proffer an alternative to the costlier, environmentally unfriendly and more commonly used cement while advocating waste re-use. Geotechnical tests including consistency limits, compaction, permeability, unconfined compressive strength (UCS) and California bearing ratio (CBR) were conducted on the different mixtures. Results of this study indicate significant improvement in terms of workability, strength and permeability reduction which was observed for the stabilized soils. Addition of up to 15% of cement and MICP and 10% of RHA was noted to optimally improve the geotechnical properties of the soils. However, cement addition produced soils with the greatest strength, reduced plasticity index, OMC and permeability with increased maximum dry density, UCS and CBR when compared with MICP and RHA addition. Conclusively, while cement, irrespective of its environmental implications proved to be the best additive of the lot, RHA and MICP showed very good prospects as veritable environmental friendly and less costly alternatives.

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Effect of Reagents Concentration on Biocementation of Tropical Residual Soil

Cited by 14 publications

References 22 publications

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

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

Review of the use of microorganisms in geotechnical engineering applications

Comparative effect of microbial induced calcite precipitate, cement and rice husk ash on the geotechnical properties of soils

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