Influence of Fiber Content and Length on Engineering Properties of MICP-Treated Coral Sand

Fang, Xiangwei; Yang, Yang; Chen, Zhe; Liu, Hanlong; Xiao, Yang; Shen, Chunni

doi:10.1080/01490451.2020.1743392

Cited by 81 publications

(36 citation statements)

References 26 publications

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Section: Discussionmentioning

confidence: 73%

“…The value and its standard deviation of UCS for each sample after treatment are shown in Figure 3. Since the injection of EICP treatment solution in this test circulated only seven times, compared with the results of Fang et al and Zhao et al [20,21], the cementing efficiency and UCS herein are generally low. Compared to the UCS of traditional EICP-treated samples, the effect of adding 3 mm fiber on UCS improvement of sands treated by EICP was considerably small, while the addition of PVA fibers with lengths of 6, 9, and 12 mm had more significant effects on the strength improvement, with the 9 mm fiber having showed the best effect.…”

Section: Ucsmentioning

confidence: 68%

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Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

et al. 2021

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Enzyme-induced calcium carbonate precipitation (EICP) technology can improve the strength of treated soil. But it also leads to remarkable brittleness of the soil. This study used polyvinyl alcohol (PVA) fiber combined with EICP to solidify sand. Through the unconfined compressive strength (UCS) test, the effect of PVA fiber incorporation on the mechanical properties of EICP-solidified sand was investigated; the distribution of CaCO3 in the sample and the microstructure of fiber-reinforced EICP-treated sand were explored through the calcium carbonate content (CCC) test and microscopic experiment. Compared with the sand treated by EICP, the strength and stiffness of the sand reinforced by the fiber combined with EICP were greatly improved, and the ductility was also improved to a certain extent. However, the increase of CCC was extremely weak, and the inhomogeneity of CaCO3 distribution was enlarged; the influence of fiber length on the UCS and CCC of the treated sand was greater than that of the fiber content. The improvement of EICP-solidified sand by PVA fiber was mainly due to the formation of a “fiber–CaCO3–sand” spatial structure system through fiber bridging, not the increase of CCC.

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Section: Discussionmentioning

confidence: 73%

Section: Ucsmentioning

confidence: 68%

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

et al. 2021

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“…In some previous studies of fiber-reinforced soil, the results of optimum fiber content were also obtained [ 39 , 40 , 41 ]. Based on the test results of water absorption and unconfined compressive strength, the optimum content of glass fiber and polyester fiber obtained were 0.20% and 0.25%, respectively.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2021

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Microbial-induced calcite precipitation (MICP) has been a promising method to improve geotechnical engineering properties through the precipitation of calcium carbonate (CaCO3) on the contact and surface of soil particles in recent years. In the present experiment, water absorption and unconfined compressive strength (UCS) tests were carried out to investigate the effects of three different fiber types (glass fiber, polyester fiber, and hemp fiber) on the physical and mechanical properties of MICP-treated calcareous sand. The fibers used were at 0%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, and 0.40% relative to the weight of the sand. The results showed that the failure strain and ductility of the samples could be improved by adding fibers. Compared to biocemented sand (BS), the water absorption of these three fiber-reinforced biocemented sands were, respectively, decreased by 11.60%, 21.18%, and 7.29%. UCS was, respectively, increased by 24.20%, 60.76%, and 6.40%. Polyester fiber produced the best effect, followed by glass fiber and hemp fiber. The optimum contents of glass fiber and polyester fiber were 0.20% and 0.25%, respectively. The optimum content of hemp fiber was within the range of 0.20–0.25%. Light-emitting diode (LED) microscope and scanning electron microscope (SEM) images lead to the conclusion that only a little calcite precipitation had occurred around the hemp fiber, leading to a poor bonding effect compared to the glass and polyester fibers. It was therefore suggested that polyester fiber should be used to improve the properties of biocemented sand.

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“…The bacteria used in this study was Micrococcus yunnanensis (hereafter denoted as G1), which was isolated from the coastal area of Porto Rafti, Greece [ 17 ]. The key features of this bacteria ( Figure 3 ) are that it is known to exhibit comparatively high urease activity with salt-tolerant properties and can survive for extended periods of time in various temperature and pH conditions, as well as in nutrient-deficient conditions [ 18 ]. Liquid ZoBell2216 medium was used as the culture solution for the selected bacterial species.…”

Section: Methodsmentioning

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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Influence of Fiber Content and Length on Engineering Properties of MICP-Treated Coral Sand

Cited by 81 publications

References 26 publications

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

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

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

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