Fracture mechanics interpretation of thin spray-on liner adhesion tests

Ozturk, H.

doi:10.1016/j.ijadhadh.2012.01.001

Cited by 22 publications

(10 citation statements)

References 9 publications

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“…The findings validated that TSLs and variant layer combinations may be as effective or superior to conventional support materials for mitigating rockburst or similar damage in highly stressed mine environments. Due to its benefits, TSL has attracted increasing attention as an alternative to steel mesh in underground roadway support [12][13][14][15]. These liners may be used in hard rock mines and coal mines [2,[16][17][18].…”

Section: Support Provided By Tslsmentioning

confidence: 99%

Influence of Polypropylene Fiber on Tensile Property of a Cement-Polymer Based Thin Spray-On Liner

et al. 2019

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The influence of a polypropylene fiber on the tensile properties of a cement-polymer based thin spray-on liner (TSL) was investigated in this study. Two different contents of fiber were added to the liner, yielding two TSL groups. Tensile tests were performed (in accordance with the ASTM D638 standard) on the two groups of specimens as well as the control group at 1, 7, 14, and 28-day curing. The test result verified the large plasticity and low elastic modulus of the TSL compared with the fiber. SEM examination revealed that fibers lying parallel to the load direction ruptured or were pulled out from the matrix, which was beneficial to the tensile strength, but detrimental to the elongation because of their high stiffness. Other fibers lying perpendicular with the load direction were detrimental to both tensile strength and elongation through aggravating the propagation of the cracks. The tensile strength was improved by fiber incorporation, while the elongation was reduced at all curing. The influence of fibers on tensile toughness was uncertain since tensile toughness depended on strength as well as deformity.

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Section: Support Provided By Tslsmentioning

confidence: 99%

Influence of Polypropylene Fiber on Tensile Property of a Cement-Polymer Based Thin Spray-On Liner

et al. 2019

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“…Thin spray-on liners (TSLs) represent an emerging support technology that originated in Europe and the United States in the 1990s. 1,2 For this technology, novel spraying materials with special mechanical properties are employed to rapidly form super-thin liners (\10 mm) that play a role in projects such as roadway support and sealing. [3][4][5][6] In addition, TSL support technology has great significance for preventing mine disasters.…”

Section: Introductionmentioning

confidence: 99%

Effects of substrate materials and liner thickness on the adhesive strength of the novel thin spray-on liner

Chen

Zhou

Liu

et al. 2020

Advances in Mechanical Engineering

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In order to comprehensively investigate the influence of the thickness of thin spray-on liners on their adhesive strength with different surrounding rock environments, pull-off tests were employed to measure the adhesive strength of thin spray-on liners of different thickness on the surface of various substrates (granite, sandstone, concrete, and coal), which were used to simulate different surrounding rock environments. The results indicated that the failure mode was mainly liner material–substrate adhesion failure when granite, sandstone, or concrete was used as the substrate, while substrate failure was observed to occur more frequently when coal was used as the substrate. The variation rules of the adhesive strength ( σ) of thin spray-on liners, along with liner thickness ( t), for different surrounding rock environments were obtained: [Formula: see text] for granite, [Formula: see text] for sandstone, [Formula: see text] for concrete, and [Formula: see text] ( t < 4) and [Formula: see text] ( t≥4) for coal. Furthermore, analysis of the standard deviation of experimental adhesive-strength data suggested that the variation in adhesive strength decreased in the following sequence: coal > concrete > sandstone > granite. The achievements of the current study provide a theoretical basis for the on-site determination of thin spray-on liner thickness requirements, as well as the scientific and rational design of liner material structure.

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“…For instance, Fan et al [21] applied graft copolymerization using lignin sulfonate as the base to synthesize a novel cementing agent for suppressing dust in coal mines; Spagnol et al [22] used chitosan-grafted polyacrylic acid/ash-based husk to prepare the highly water-absorbing hydrogel composite material. As for the study on roadway thin spray materials, Ozturk [23] conducted systematic tests on the adhesion geometry model and failure model associated with a thin spray material; Mpunzi et al [24] proved experimentally that the thin spray material can enhance the tensile strength of the rock and spray concrete; and Guner and Ozturk [25] studied the tensile mechanical property of the thin spray material through the hardening experiment and numerical analysis. However, there exist few reports on the application of thin spray materials to the coal mine roadway.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of a Reinforcing Dust-Cementing Material for Thin Spray-On Liners in Mine Roadways

Zhou

et al. 2019

Advances in Materials Science and Engineering

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The sprayed concrete in mine roadways suffers from a prolonged exposure to the harsh environment in the underground mine, leading to its detachment which may compromise its supporting strength. Besides, the dust-cementing effect of the conventional concrete is poor, providing very limited contribution to suppress the dust-laden airflow. As such, the present experiment uses sodium carboxymethyl cellulose as the base to produce a novel thin spray material through graft copolymerization based on acrylic acid and polyaluminum chloride. This new material can not only reinforce the surrounding rock of the roadway but also cement the dust in the airflow. Infrared spectroscopy, X-ray diffraction, thermal gravimetric analysis, and SEM are employed collectively to study the microscale reaction and structure of the product. A suite of experiment testing is carried out concerning the performance of the developed spray material, which reveals the supreme mechanical strength and desired properties of the hardened film developed from the spray material.

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Fracture mechanics interpretation of thin spray-on liner adhesion tests

Cited by 22 publications

References 9 publications

Influence of Polypropylene Fiber on Tensile Property of a Cement-Polymer Based Thin Spray-On Liner

Influence of Polypropylene Fiber on Tensile Property of a Cement-Polymer Based Thin Spray-On Liner

Effects of substrate materials and liner thickness on the adhesive strength of the novel thin spray-on liner

Synthesis and Properties of a Reinforcing Dust-Cementing Material for Thin Spray-On Liners in Mine Roadways

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