Analysis of strength characteristics of carbon fiber–reinforced microbial solidified sand

Qiu, Rongkang; Tong, Huawei; Fang, Xiaotian; Liao, Yuan Mei; Li, Yadong

doi:10.1177/1687814019884420

Cited by 20 publications

(12 citation statements)

References 5 publications

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“…The strength gain turned out to be less when the fiber addition became more than 1%, but the samples’ ductility was enhanced significantly. Since bio-cemented sand is typically a brittle material, fiber addition provides an essential improvement for bio-cemented sand samples on strength and stress–strain behaviors [ 30 ]. It is worth noting that there is a delicate balance between strengthening and softening in terms of peak strength.…”

Section: Resultsmentioning

confidence: 99%

“…fiber addition provides an essential improvement for bio-cemented sand samples on strength and stress-strain behaviors [30]. It is worth noting that there is a delicate balance between strengthening and softening in terms of peak strength.…”

Section: Unconfined Compressive Strengthmentioning

confidence: 99%

“…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%

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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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Section: Resultsmentioning

confidence: 99%

Section: Unconfined Compressive Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…Earlier studies showed that using fibrous materials increased bacterial interactions with the cementation solution and facilitated uniform CaCO 3 precipitation within the sand pores in MICP-treated soil [ 8 ]. Several studies have also revealed that the addition of fiber materials can substantially increase the engineering properties of MICP-treated soil (for example the shear strength, ductility, brittleness behavior, internal friction, and rigidity) [ 9 ]. However, to address these challenges, most of these previous studies focused on using synthetic-polymer-based fiber materials, such as non-woven geotextile fiber, steel fiber, polypropylene fiber, glass fiber, and carbon fiber, which are associated with relatively high costs, health concerns, and environmental hazards [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Addition of Plant-Based Natural Fibers (Jute) on Biocemented Sand Using MICP Method

et al. 2020

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The microbial-induced carbonate precipitation (MICP) method has gained intense attention in recent years as a safe and sustainable alternative for soil improvement and for use in construction materials. In this study, the effects of the addition of plant-based natural jute fibers to MICP-treated sand and the corresponding microstructures were measured to investigate their subsequent impacts on the MICP-treated biocemented sand. The fibers used were at 0%, 0.5%, 1.5%, 3%, 5%, 10%, and 20% by weight of the sand, while the fiber lengths were 5, 15, and 25 mm. The microbial interactions with the fibers, the CaCO3 precipitation trend, and the biocemented specimen (microstructure) were also evaluated based on the unconfined compressive strength (UCS) values, scanning electron microscopy (SEM), and fluorescence microscopy. The results of this study showed that the added jute fibers improved the engineering properties (ductility, toughness, and brittleness behavior) of the biocemented sand using MICP method. Furthermore, the fiber content more significantly affected the engineering properties of the MICP-treated sand than the fiber length. In this study, the optimal fiber content was 3%, whereas the optimal fiber length was s 15 mm. The SEM results indicated that the fiber facilitated the MICP process by bridging the pores in the calcareous sand, reduced the brittleness of the treated samples, and increased the mechanical properties of the biocemented sand. The results of this study could significantly contribute to further improvement of fiber-reinforced biocemented sand in geotechnical engineering field applications.

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“…e brittle failure was prevented because the solidified sand would not lose strength immediately after the damage [23,24]. Most of the previous research mainly used polypropylene fiber as the reinforcement for the microbial solidified sand.…”

Section: Introductionmentioning

confidence: 99%

Strength and Micromechanism Analysis of Microbial Solidified Sand with Carbon Fiber

Qiu

Tong

et al. 2020

Advances in Civil Engineering

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Microbially induced calcite precipitation (MICP) is an effective and ecofriendly technology that utilizes the microbes-induced mineralization to improve foundation soils of the transportation infrastructure. The carbon fiber can be used along with the MICP in order to reduce the brittleness of microbial solidified soil. This paper investigated the strength of carbon fiber-reinforced sand with different mass fractions through a series of unconfined compression tests. The effect of fiber content on the solidification of carbon fiber-reinforced sand was quantitatively analyzed using calcium carbonate content test and penetration test. The microsolidification mechanism was investigated by micrographs from the optical and scanning electron microscope (SEM). The test results showed that unconfined compressive strength generally increased first and then decreased with the increase of the fiber content. The optimal fiber content in the silica and calcareous sand was 0.2% and 0.1%, respectively. The bulging deformation of the fiber-reinforced sand sample was gradually developed along with the fiber breakage during loading.

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Analysis of strength characteristics of carbon fiber–reinforced microbial solidified sand

Cited by 20 publications

References 5 publications

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

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

The Influence of the Addition of Plant-Based Natural Fibers (Jute) on Biocemented Sand Using MICP Method

Strength and Micromechanism Analysis of Microbial Solidified Sand with Carbon Fiber

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