Studying Shear Performance of Flax Fiber-Reinforced Clay by Triaxial Test

Ma, Qiang; Yang, Yicong; Xiao, Henglin; Wu, Xing

doi:10.1155/2018/1290572

Cited by 16 publications

(7 citation statements)

References 33 publications

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“…According to reference 16 , the optimum fiber content of silty clay was 0.8%(ω m ). Therefore, the mass percent of flax-fiber in this study is 0.8%(ω m ).…”

Section: Selection Of Fibersmentioning

confidence: 99%

“…The permeability of granular soils was checked through standard permeability test methods by Saghari and Bagheri 15 , and they evaluated the influence of polymer-fiber on soil permeability coefficients with different length of fibers. Ma 16 carried out a series of laboratory triaxial tests to investigate the fiber reinforcement mechanism, and to study the characteristics of flax-fiber reinforced clay, thereafter, he found that the optimal reinforcement rate for clay was 0.8%. Tong 17 put forward that a combined bamboo strips and flax-fiber reinforcement method of the clay.…”

Section: Introductionmentioning

confidence: 99%

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Effect of microstructure change on permeability of flax-fiber reinforced silty clay soaked with zinc-ion solution

Xiang

et al. 2020

Sci Rep

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With the application of fiber-reinforcement technology, the mechanical properties of silty clay are improved with fiber reinforcement. However, the variation of permeability coefficient and other parameters of flax-fiber reinforced silty clay have not been sufficiently studied. In this study, the permeability of flax-fiber reinforced silty clay soaked with zinc-contaminated solution under different osmotic pressure was tested by a flexible-wall permeameter, and the effects of zinc-ion concentration and confining pressure on the permeability of flax-fiber reinforced silty clay were studied. Genius XRF was employed to detect the types and quantity of metal elements in the specimens, thereafter, the reasons for the change of permeability were explained from chemical and microscopic perspective. The results showed that the permeability coefficient of flax-fiber reinforced silty clay decreased significantly with the increase of zinc-ion concentration in a low concentration (about 1-10 mg L −1). While in a high concentration (about 100 mg L −1), the permeability coefficient of flax-fiber reinforced silty clay changed little with the increase of zinc-ion concentration. While the flax-fiber reinforced silty clay was not soaked with zinc-ion solution, the permeability coefficient of the specimen increased with the increase of confining pressure. However, when the flax-fiber reinforced silty clay was soaked with zinc-contaminated solution, the permeability coefficient first decreased and then tended to be constant with the increase of confining pressure. With the increase of confining pressure, the porosity of flax-fiber reinforced silty clay decreased, and with the increase of zinc-ion concentration, the porosity of flax-fiber reinforced silty clay first increased and then decreased. In recent years, with the rapid development of industry, the pollution degree of industrial development area has been increasing 1-3. There are some engineering projects built on the ground of demolished landfills, and residual contaminants in the subgrade always change the physical and chemical properties of the ground soil 4-6. Depending on the survey bulletin of soil pollution in China published on April 17, 2018, the survey covers all of China's inland farmland, which included woodlands, grasslands, unused land and construction land, about 6.3 × 10 12 m 2. The result showed that the environmental in industrial wasteland was seriously polluted, and the soil pollution was common around the world. Among those pollutants, one class of the most serious pollutants is heavy metals. However, the eight kinds of heavy metals, including Cr, Ni, Cu, Zn, As, Cd, Hg and Pb, which accounted for the main part of inorganic pollution, and the average concentrations of them were 63.

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“…According to reference 16 , the optimum fiber content of silty clay was 0.8%(ω m ). Therefore, the mass percent of flax-fiber in this study is 0.8%(ω m ).…”

Section: Selection Of Fibersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of microstructure change on permeability of flax-fiber reinforced silty clay soaked with zinc-ion solution

Xiang

et al. 2020

Sci Rep

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“…e use of plant fibers, such as bamboo, palm coconut, wood, and hemp fibers (jute, sisal, ramie, flax, etc. ), in composite materials has become a hot research topic [5][6][7][8]. Palm fibers have medium strength, high elongation, wear and corrosion resistance, low cost, and good mechanical properties [9].…”

Section: Introductionmentioning

confidence: 99%

Direct Shear Creep Characteristics and Microstructure of Fiber-Reinforced Soil

Tang

Duan

et al. 2021

Advances in Civil Engineering

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Fiber-reinforced soil is an excellent engineering material that has become a focus of research. Most studies focus on the conventional mechanical properties of reinforced soil, such as its tensile, compressive, and shear strength, and rarely study its creep-related mechanical properties. However, when such soil is used as backfill, the creep effect should not be ignored. This study explored the characteristics of creep mechanics in reinforced soil, the fiber-reinforcement mechanism, and the dynamics of microstructures before and after creep tests. Direct shear creep tests were carried out using a direct shear creep tester on soil reinforced with natural palm fibers of equal length (1.5 cm) in different amounts (0%, 0.2%, 0.6%, 1.0%). Microscale tests were carried out on the reinforced soil samples before and after the creep tests by polarized light and scanning electron microscopy. The results show that the fiber reinforcement can restrain the deformation and enhance the long-term strength of soil. However, a nonlinear relationship between the reinforcement effect and fiber content was found, with 0.6% being the optimal content. Palm fibers have rough surfaces, grooves, and independent pore chambers, which increase the effective contact area and interaction with the soil. With increases in fiber content, the fibers interweave to form a nestled network structure, which increases the strength and integrity of the soil. Fiber addition changes the microstructure of the soil pores; the proportion of large pores decreases and that of small pores increases. Under the effect of creep, the pore changes follow the principle of pore homogenization; large pores are destroyed and transformed into small pores, causing the porosity of reinforced soil to decrease faster and be less porous than unreinforced soil. This research can provide technical reference for the engineering application of palm fiber-reinforced soil.

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“…Qu and Sun [26] carried out a series of one-dimensional consolidation and triaxial tests on samples of unreinforced and reinforced Shanghai clayey soil with different percentages of randomly distributed wheat straw fibers, and the test results showed that the addition of wheat straw fiber leads to a significant increase in shear strength and friction angle of the soil and there is an optimum fiber content of 0.2-0.3% that makes this increase maximal. Ma et al [27] put regenerated flax fiber into clay and investigated the shear performance of flax fiber-reinforced clay by unconsolidated and undrained triaxial tests, and the test results showed that the shear strength of the flax fiber-reinforced clay is significantly improved compared with that of the pure clay but the internal friction angle is small and the cohesion is obviously increased. In research on the mechanical properties of soil reinforced by natural bamboo material, Bergado et al [28] investigated the reinforcement effect of bamboo as a reinforcement material by the direct shear test and pull out test, and the test result showed that the reinforcement effect of bamboo mesh is slightly better than that of the geogrid.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Clayey Soils by Combined Bamboo Strip and Flax Fiber Reinforcement

Fang

2019

Advances in Civil Engineering

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A combined bamboo strips and flax fiber reinforcement method to reinforce clay is proposed in this paper, and in order to study the mechanical properties of bamboo strips and flax fiber-reinforced clay (BFRC), a series of tensile tests were carried out to obtain the relationship between the average tensile force and deformation of flax fiber and bamboo strip; after that, triaxial shear tests were carried out under the conditions of different confining pressures. In addition, the reinforcement mechanism of the bamboo strips and flax fiber-reinforced clay (BFRC) is analyzed. The test results show that the cohesion and internal friction angle of the bamboo strips and flax fiber-reinforced clay (BFRC) are improved compared with the pure clay. In the case of flax fiber-reinforced clay, the cohesion of reinforced clay is increased by 18.34% and the friction angle is only increased by 0.39%. In the case of bamboo strips and flax fiber-reinforced clay, the cohesion of reinforced clay is increased by 26.36% and the friction angle is only increased by 10.24%. The addition of bamboo strips improves the shear strength of the reinforced clay and effectively improves the deformation resistance of the flax fiber-reinforced clay (FRC). And it increases the internal friction angle and cohesion of the clay, although the increase in the strength is mainly reflected in the influence on the cohesion.

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Studying Shear Performance of Flax Fiber-Reinforced Clay by Triaxial Test

Cited by 16 publications

References 33 publications

Effect of microstructure change on permeability of flax-fiber reinforced silty clay soaked with zinc-ion solution

Effect of microstructure change on permeability of flax-fiber reinforced silty clay soaked with zinc-ion solution

Direct Shear Creep Characteristics and Microstructure of Fiber-Reinforced Soil

Improvement of Clayey Soils by Combined Bamboo Strip and Flax Fiber Reinforcement

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