Studying effects of interface surface roughness, mean particle size, and particle shape on the shear behavior of sand-coated CFRP interface

Namjoo, Amir Mostafa; Baniasadi, Majid; Jafari, Khashayar; Salam, Sajjad; Toufigh, Mohammad Mohsen; Toufigh, Vahid

doi:10.1016/j.trgeo.2022.100841

Cited by 9 publications

(2 citation statements)

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“…They transmit the shear force from upper layer to the lower layer of GCL. The post-peak reduction in shear stress can be linked to the extension of reinforcing fiber at large shear strains, which causes loss of tensile strength, leading to the reduction in the interface shear strength [11][12][13] . The values of interface www.nature.com/scientificreports/ friction angle (δ) and interface adhesion (a p ) for dry GCL-sand interfaces computed from the best-fit lines of the failure envelopes considering peak interface shear stresses at different normal stresses shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Researchers have explored the effect of size and shape of sand particles on the interface behaviour with different types of reinforcements. The size of sand grains combined with roughness characteristics of the reinforcement controls the interface shear strength [10][11][12][13] . During their functioning in landfill, GCLs get hydrated due to their exposure to leachate or infiltrating precipitation, causing the swelling of encapsulated bentonite layer.…”

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confidence: 99%

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Engineering benefits of replacing natural sand with manufactured sand in landfill construction

Pillai

Latha

2023

Sci Rep

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Translational sliding failures in landfills are often triggered by inadequate shear strength of interfaces in liners and covers. Geosynthetic Clay Liners (GCL) are used in different components of landfills to contain the leachate. GCLs are usually placed above a compacted sand subgrade to develop higher shear resistance. In the context of depleting natural sand resources, the present study explores the feasibility of replacing natural sand with manufactured sand (Msand) in landfill construction. Interface shear tests were performed on GCL in contact with river sand and Msand of similar gradation to evaluate the shear strength at different normal stresses and hydration conditions. It is found that Msand provides higher interface shear strength with GCL compared to river sand. Digital image analysis of tested specimens of GCL showed that variation in particle morphology of the two sands has direct influence on the microlevel interaction mechanisms governing the shear strength. Quantification of morphological parameters showed that Msand particles are angular and rough compared to natural sand particles, leading to higher particle interlocking. Hydration of the GCL reduced the interface shear strength, the effect being less in case of Msand. The study highlights that replacement of natural sand with Msand has added benefits.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%