Strength characteristics of modified polypropylene fiber and cement-reinforced loess

Yang, Bohan; Weng, Xingzhong; Liu, Junzhong; Kou, Ya-nan; Jiang, Le; Li, Honglei; Yan, Xiaohui

doi:10.1007/s11771-017-3458-0

Cited by 46 publications

(31 citation statements)

References 13 publications

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“…When the fiber mass content was around 5% , the compressive strength reached its maximum value. Yang et al [28] conducted unconfined tests on cement loess samples with different polypropylene (PP) fiber mass contents and found that fibers have the best effect on the compressive strength and ductility in samples with 4% fiber mass content. Estabragh et al [29] performed unconfined tests on PP fiber cement soft soils with different lengths and contents and pointed out that the compressive strength and tensile strength of cement soft soils increased with the increase in fiber mass content within a certain range, while the fiber length had little effect.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Triaxial Mechanical Characteristics of Cement-Treated Subgrade Soil Admixed with Polypropylene Fiber

et al. 2019

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In order to evaluate the improvement effect of fiber on the brittle failure of cement-treated subgrade soil, a series of triaxial unconsolidated undrained (UU) tests were carried out on samples of polypropylene fiber-cement-treated subgrade soil (PCS) with polypropylene fiber mass content of 0‰, 2‰, 4‰, 6‰, and 10‰. The results showed that, (1) the deviatoric stress-axial strain curve of PCS samples were all strain-softening curves. (2) For the same fiber mass content, the peak stress, residual stress, and strain at peak stress of PCS samples gradually increases with the increase in the confining pressure, while their brittleness index gradually decreases. (3) With the increase in confining pressure, compared with that of the 0‰ PCS sample, the increase in peak stress, residual stress, and strain at peak stress of 6‰ PCS sample were in the ranges of 24%–29%, 87%–110%, and 85%–120%, respectively. The decrease in the brittleness index and failure angle was 52%–79% and 16%, while the cohesion and internal friction angle increased by 25.9% and 7.4%, respectively. The results of this study indicate that it is feasible to modify cement subgrade soil with an appropriate amount of polypropylene fiber to mitigate its brittle failure.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Triaxial Mechanical Characteristics of Cement-Treated Subgrade Soil Admixed with Polypropylene Fiber

et al. 2019

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“…Currently, the additions of cement and lime into compacted loess are the most common treatments in engineering practice, and the effect of cement and/or lime content on the mechanical behavior of the treated loess has been reported frequently [18][19][20]. e chemical reaction of cement or lime would result in aggregates forming as bonding among the soil particles, which would enhance the strength of the soil.…”

Section: Introductionmentioning

confidence: 99%

Effect of Admixture on the Hydraulic Conductivity of Compacted Loess: A Case Study

Pan

Zhang

et al. 2020

Advances in Civil Engineering

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Hydraulic characteristic of the exposed ground plays an important role in the construction of “sponge city,” which is a popular concept in the world recently. Loess soil, which is a common geomaterial in its distribution area approximately 9.3% of the world’s land surface, usually could not satisfy the engineering requirement only by compacting without any other treatments. This paper aims to investigate the effect of a natural geomaterial, lateritic soil, which is more economical and environmental than the traditional admixtures such as cement and lime, on the saturated hydraulic conductivity (ksat) of compacted loess. A series of falling-head permeability tests on pure loess and lime-treated loess were carried out firstly for comparison; then lime-treated loess mixed with different contents of lateritic soil was tested. To verify the availability of the coverage of high density lateritic soil on pure loess for antipermeability, which is a common treatment in local area, tests of different thickness of the coverage were conducted. The test results revealed that the admixture of lime could obviously decrease ksat of pure loess and 3% might be the most economical content. An empirical algorithm was proposed based on the results to estimate ksat of lime-treated loess of which the lime content is out of the scope studied in this paper, and it would be useful for engineering design and numerical simulation of safety evaluation. The addition of lateritic soil in the 3% lime-treated loess could further decrease ksat and its performance for antipermeability was better than increasing the lime contents simply. The coverage of high density lateritic soil could also improve the antipermeability of loess, and thickness at least of 30 mm was suggested for engineering practice.

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“…Tran et al [18] studied the toughness of waste cornsilk fiber in soil-cement and found that 0.25%-0.5% fibers were recommended to use in soil-cement. Due to the degradation of natural fiber in soil, synthetic fibers (e.g., glass fiber, nylon fiber, and polypropylene fiber) are employed as the inclusion [21][22][23][24][25]. Li et al [21] added the glass fiber into the soil-cement and found that under the condition of 0.6% glass fiber, the soil particles and mineral particles can be in maximum contact with the fiber, showing the excellent mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

“…In these fibers, polypropylene fiber that can enhance the soil strength and reduce the shrinkage is widely used. Tang and Gu [23] studied the addition of polypropylene fiber in soil-cement to reduce the brittleness of soil-cement and revealed that bond strength and friction at the interface seem to be the dominant mechanism controlling the reinforcement benefit. Consoli et al [24] investigated that the inclusion of polypropylene fiber in the soil-cement increased the unconfined compressive strength and proposed a porosity/volumetric cement content for predicting the unconfined compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties, Failure Mode, and Microstructure of Soil-Cement Modified with Fly Ash and Polypropylene Fiber

Duan

Zhang

2019

Advances in Materials Science and Engineering

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In order to investigate the effects of fly ash and polypropylene fiber on mechanical properties, failure mode, and microstructure of soil-cement, the unconfined compression test, splitting tension test, and scanning electron microscopy (SEM) test of soil-cement with different polypropylene fiber contents (0%, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% by weight of dry soil) and fly ash contents (0%, 4%, 8%, and 12% by weight of dry soil) were carried out. The compressive and tensile strengths, deformation characteristics, failure mode, and microstructure of soil-cement modified with fly ash and polypropylene fiber were analyzed. The results show that the unconfined compressive strength and splitting tensile strength of soil-cement show a trend of increasing first and then decreasing with the increase of polypropylene fiber and fly ash content. Under the condition of 0.4% polypropylene fiber and 8% fly ash, the unconfined compressive strength and the splitting tensile strength are 4.90 MPa and 0.91 MPa, respectively, which increased by 32.79% and 51.67% as compared with the plain soil-cement, respectively. When 8% fly ash was used in the experiment, the unconfined compressive peak strain and the splitting tensile peak strain of the inclusion of 0.4% polypropylene fiber were 0.0410 and 0.0196, respectively. The corresponding peak strains were increased by 20.94% and 68.97% as compared with non-fiber-stabilized soil-cement, respectively. The stress-strain curve of fly ash soil-cement modified with polypropylene fiber can be divided into compaction phase, linear rise phase, nonlinear rise phase, and failure phase. Polypropylene fiber constrains the lateral deformation of fly ash soil-cement, which improves the peak strain and the failure mode of soil-cement.

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Strength characteristics of modified polypropylene fiber and cement-reinforced loess

Cited by 46 publications

References 13 publications

Investigation on the Triaxial Mechanical Characteristics of Cement-Treated Subgrade Soil Admixed with Polypropylene Fiber

Investigation on the Triaxial Mechanical Characteristics of Cement-Treated Subgrade Soil Admixed with Polypropylene Fiber

Effect of Admixture on the Hydraulic Conductivity of Compacted Loess: A Case Study

Mechanical Properties, Failure Mode, and Microstructure of Soil-Cement Modified with Fly Ash and Polypropylene Fiber

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