Mechanical Characteristics of Lime-Treated Subgrade Soil Improved by Polypropylene Fiber and Class F Fly Ash

Wang, Wei; Lv, Beifeng; Zhang, Chen; Li, Na; Pu, Shaoyun

doi:10.3390/polym14142921

Cited by 11 publications

(5 citation statements)

References 32 publications

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“…From the literature review, it appears that many researchers have investigated the effect of the addition of polypropylene fibres on the parameter of the stabilised soil. Their studies show that the fibres in lime-stabilised clay mainly act to increase its plasticity [24]. There are no publications in the literature that directly refer to non-cohesive soil stabilised with cement reinforced with polypropylene fibres.…”

Section: Resultsmentioning

confidence: 99%

The Impact of Polypropylene Fibre Addition on the CBR Value

Dobrzycki

2023

Architecture, Civil Engineering, Environment

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The classic test for soil or aggregate bearing capacity in road construction is the CBR test. The results of the CBR were determined for gravelly sand and sand with the addition of 1.5% cement, as well as for their mixtures with 18 mm long polypropylene fibres in the amounts of 0.1%, 0.2% and 0.3%. The effect of compaction and time of curing of samples stabilised with hydraulic binder were also determined. The natural soil without cement and fibre additions had relatively high CBR values. The additions of 0.1% and 0.2% polypropylene fibres to the dry mass of the soil resulted in an approximately 2-fold increase in the CBR value for the samples compacted using the standard method. Increasing the amount of fibres to 0.3% caused a reduction in the CBR value to that obtained without fibre addition. For samples compacted using the modified Proctor method, the observations are different. Only the sample with 0.2% fibre addition achieved a slightly higher CBR value. Moreover, the addition of 1.5% cement and the length of treatment increased the CBR values.

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Section: Resultsmentioning

confidence: 99%

The Impact of Polypropylene Fibre Addition on the CBR Value

Dobrzycki

2023

Architecture, Civil Engineering, Environment

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“…Over the last several decades, research has been aimed at characterizing the fundamental shear mechanism and identifying the various factors influencing the shear strength, including construction conditions [7], fiber content [8][9][10][11], and the initial state of the specimen [12] have been extensively investigated. In parallel, the evolution of the microstructure of the shear surface, as well as the distribution of the soil particles and fibers, could also be investigated [13].…”

Section: Introductionmentioning

confidence: 99%

Shear behavior of basalt fiber modified compacted red mudstone as subgrade fill material

Xu,

Liu,

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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This study experimentally investigated the shear behavior of basalt fiber-modified compacted red mudstone as a subgrade of a high-speed railway. We examined the effects of different vertical stresses, initial water contents, and fiber contents on brittleness and dilatancy. Several direct shear tests were conducted under the aforementioned conditions. The stress displacement curve tended to vary from softening to hardening with an increase in vertical stress. In the Mohr–Coulomb mode, except for the saturated state, the residual internal friction angle was greater than the peak value, whereas the residual cohesion was lesser than the peak value. The maximum cohesion occurred at the optimal water and fiber content, whereas the friction angle exhibited a downward trend with an increase in the contents discussed above. The brittleness index (I b ) was defined as the ratio of the peak to residual shear strengths. The magnitude of the brittleness index reduced with increase in the vertical stress. Moreover, the maximum value occurred at the optimal water and fiber content. Furthermore, the deformation mechanism was discussed based on the dilatancy angle(ψ). Based on the data, three different stages were proposed: Softening–Dilatancy (S1), the Hardening–Dilatancy (S2), and Hardening–Shrinkage (S3).

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“…The behavior of cohesive soil reinforced by polypropylene fiber was investigated by Al-Neami et al (2022) [27]. In the same year, Wang et al (2022) tackled the subject of lime-treated subgrade soil improved by polypropylene fiber and class F fly ash through an investigation of the mechanical characteristics [28]. In 2023, Rajabi et al analyzed the influence of polypropylene and glass fibers on the strength and failure behavior of clayey sand soil [29].…”

Section: Introductionmentioning

confidence: 99%

Effect of Polypropylene Fibers on Swelling Potential and Shear Strength of Clay

2023

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Expansive clays can cause major problems for urban development (roads, railways, infrastructure, etc.); therefore, reducing the swelling potential of clays has always been a concern in the geotechnical field. The presented paper investigates the effect of polypropylene reinforcement fibers on the swelling potential and shear strength of clay. The samples studied were taken from the clayey region of Mila, located in the northern east of Algeria. The experimental procedure adopted in this research consists first of the assessment of the physical, mechanical, and mineralogical characteristics of the soil samples without reinforcement. Then, swelling pressure, swelling rate, and swelling index are used to assess the swelling potential of these samples. After the reinforcement using a variety of polypropylene fiber concentrations (2 to 6% of the weight of the dry clay), the free swelling is clearly reduced. The optimum reinforcement rate in this case is 4%, in which the swelling was reduced by 90.7%. Finally, to offer more insights regarding the impact of clay reinforcement using polypropylene fibers, the effect of this later on the mechanical properties of the studied clay was also analyzed through the tangential shear strength. It was found that the polypropylene fibers increased the tangential shear resistance of Mila’s clay. Doi: 10.28991/CEJ-2023-09-03-04 Full Text: PDF

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Mechanical Characteristics of Lime-Treated Subgrade Soil Improved by Polypropylene Fiber and Class F Fly Ash

Cited by 11 publications

References 32 publications

The Impact of Polypropylene Fibre Addition on the CBR Value

The Impact of Polypropylene Fibre Addition on the CBR Value

Shear behavior of basalt fiber modified compacted red mudstone as subgrade fill material

Effect of Polypropylene Fibers on Swelling Potential and Shear Strength of Clay

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