Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand

Zhao, Jitong; Tong, Huawei; Shan, Yi; Yuan, Jie; Peng, Qiuwang; Liang, Junling

doi:10.3390/ma14020268

Cited by 28 publications

(5 citation statements)

References 44 publications

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“…However, most previous studies focused on either floating stone columns unreinforced with geosynthetics (Ng and Tan, 2014;Shahu and Reddy, 2014;Zhou et al, 2017;Ong et al, 2018;Shan et al, 2022;Zhao et al, 2021), or geosynthetic-encased stone columns that reached a strong stratum (Murugesan and Rajagopal, 2010;Pulko et al, 2011;Yoo and Lee 2012;Gu et al, 2017a;Gu et al, 2017b;Mohapatra and Rajagopal 2017;Schnaid et al, 2017;Kadhim et al, 2018;Kong et al, 2018;Zhou and Kong, 2019a;Zhou and Kong, 2019b;Zhang et al, 2020;Tan et al, 2021). There are limited studies on the performance of floating stone columns reinforced with geosynthetic encasement.…”

Section: Introductionmentioning

confidence: 99%

Behavior of floating stone columns reinforced with geogrid encasement in model tests

Qiu

et al. 2022

Front. Mater.

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The bearing capacity and deformation characteristics of floating stone columns were complicated and are not thoroughly understood. In the present study, a series of experimental model tests of floating stone columns under vertical plate loading was performed. This study investigated the influence of geogrid encasement on the behavior of floating stone columns and provided valuable insight into the load-displacement behavior, bulging deformation, load transfer mechanism, and the radial stress of the geogrid encasement. The test results show that the bearing capacity of the floating stone column was significantly improved due to the geogrid encasement. The column with longer encasement showed higher stiffness at large settlements. The bulging deformation pattern of the column changed with different encasement lengths. More vertical pressure transferred from the top of the column to the bottom of the column due to the existence of the geogrid encasement. The fully encased stone columns developed high radial stress and achieved effective confinement of the column. The bearing capacities of the floating-encased stone columns with different encasement lengths were controlled by bulging deformation instead of penetration failure, which gave confidence that the floating-encased stone columns were an effective method for field construction in extensive soft soils.

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Section: Introductionmentioning

confidence: 99%

Behavior of floating stone columns reinforced with geogrid encasement in model tests

Qiu

et al. 2022

Front. Mater.

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“…Notably, the applications of some conventional synthetic fibers (such as carbon fibers, Kevlar fibers, and glass fibers) derived from by-products of the petroleum industry are proliferating rapidly. In recent years, these fibers are also introduced into MICP research and have produced many remarkable outcomes [ 27 , 28 , 29 , 30 ]. Although these fibers have several merits, their disadvantages include the high cost and environmental impact.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Sand Stabilization Using Bio-Cementation with Wastepaper Fiber Integration

et al. 2021

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Recently, green materials and technologies have received considerable attention in geotechnical engineering. One of such techniques is microbially-induced carbonate precipitation (MICP). In the MICP process, CaCO3 is achieved bio-chemically within the soil, thus enhancing the strength and stiffness. The purpose of this study is to introduce the wastepaper fiber (WPF) onto the MICP (i) to study the mechanical properties of MICP-treated sand with varying WPF content (0–8%) and (ii) to assess the freeze–thaw (FT) durability of the treated samples. Findings revealed that the ductility of the treated samples increases with the increase in WPF addition, while the highest UCS is found with a small fiber addition. The results of CaCO3 content suggest that the WPF addition enhances the immobilization of the bacteria cells, thus yielding the precipitation content. However, shear wave velocity analysis indicates that a higher addition of WPF results in rapid deterioration of the samples when subjected to freeze–thaw cycles. Microscale analysis illuminates that fiber clusters replace the solid bonding at particle contacts, leading to reduced resistance to freeze–thaw damage. Overall, the study demonstrates that as a waste material, WPF could be sustainably reused in the bio-cementation.

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“…To date, most studies of microbial-induced calcium carbonate precipitation have focused on treating various kinds of sands [7][8][9]. Few studies have been done on other soil types.…”

Section: Introductionmentioning

confidence: 99%

The Effect of MICP on Physical and Mechanical Properties of Silt with Different Fine Particle Content and Pore Ratio

et al. 2021

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Microbial-induced calcium carbonate precipitation (MICP) is a new soil remediation technology, which can improve the physical and mechanical properties of soil by transporting bacterial solution and cementation solution to loose soil and precipitating calcium carbonate precipitation between soil particles through microbial mineralization. Based on this technique, the effects of different fine particle content and pore ratio on the physical and chemical properties of silt after reinforcement were studied. The content of calcium carbonate, the ability of silt to fixed bacteria, unconfined compressive strength (UCS), permeability coefficient and microstructure of the samples were determined. The results showed the following: In the process of calcium carbonate precipitation induced by microorganisms, more than 50% bacterial suspension remained on the surface of silt particles and their pores. The higher the bacterial fixation rate of silt, the more CaCO3 was generated during the solidification process. The bacterial fixation rate and CaCO3 content both decreased with the increase in the pore ratio and increased with the increase in the fine particle content. XRD and SEM images show that the calcium carbonate is mainly composed of spherical vaterite and acicular cluster aragonite. There is an obvious correlation between unconfined compressive strength and CaCO3 content of silt. When CaCO3 content accumulates to a certain extent, its strength will be significantly improved. The unconfined compressive strength of silt A with pore ratio of 0.75 and fine particle content of 75% is 2.22 MPa when the single injection amount of cementing fluid is 300 mL. The permeability coefficient of cured silt can be reduced by 1 to 4 orders of magnitude compared with that of untreated silt. In particular, the permeability of MICP-treated silt A is almost impermeable.

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Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand

Cited by 28 publications

References 44 publications

Behavior of floating stone columns reinforced with geogrid encasement in model tests

Behavior of floating stone columns reinforced with geogrid encasement in model tests

Experimental Study on Sand Stabilization Using Bio-Cementation with Wastepaper Fiber Integration

The Effect of MICP on Physical and Mechanical Properties of Silt with Different Fine Particle Content and Pore Ratio

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