Shear strength testing of glass fibre reinforced thin spray-on liner

Qiao, Qiuqiu; Nemcik, Jan; Porter, Ian

doi:10.1680/geolett.14.00057

Cited by 10 publications

(4 citation statements)

References 3 publications

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“…Table 2 also shows a comparison between the mechanical performances of the materials developed in this study and other reinforcing TSL materials in the literature, mainly polymer-based ToughSkin [ 5 , 6 ] and one recently developed cement-based TSL [ 10 ]. Result indicates that the overall mechanical properties of the reinforcing TSL developed by the University of Wollongong are still superior.…”

Section: Results and Analysismentioning

confidence: 99%

“…The average compressive strength of the 40 mm-long cubic sample of the developed TSL material was 77.7 MPa. Based on the punching shear test of the 250 × 85 × 5 mm plate sample, the measured average shear strength of the material was about 33 MPa [ 5 ]; the bonding strength with coal was 0.76 MPa [ 6 ]. The material is violently ejected with small fragments when it is crushed under compression.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Study of Deformation Behaviour of Two New Reinforcing Polymeric TSLs and Their Potential Application in Deep Underground Coal Mine

et al. 2021

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Thin spray-on liner (TSL) is a surface protection technology used by spraying a polymer film, which is widely used for mine airtightness and waterproofing. A reinforcing TSL can replace steel mesh, which is a new method for roadway support. This paper reviews the development of a reinforcing TSL. Considering the deterioration of geological conditions in deep underground mining and the demand for reinforcing automation, two kinds of polymeric reinforcing TSL (RPTSL) materials are developed. The mechanical characteristics of the new TSL materials are studied experimentally. Results show that the average compressive strength, tensile strength, cohesion, and internal friction angle of the two TSL materials are 52 and 32 MPa, 12 and 8 MPa, 6.2 and 17.2 MPa, and 33.6° and 25.9°, respectively. The bonding strength between the two materials and coal is greater than the tensile strength of coal itself, and the mechanical properties of the material for comparison are lower than those of both materials. Based on the TSL support mechanism, we examine the application of the two TSL materials to the mining environment and compare the mechanical properties of polymer materials and cement-based materials. The advantages of polymer materials include versatile mechanical properties, good adhesion, and high early strength. This study provides a new support material to replace steel mesh for roadway surface support, which satisfies the needs of different surface support designs under complex geological conditions, and promotes the automation of roadway support.

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Section: Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laboratory Study of Deformation Behaviour of Two New Reinforcing Polymeric TSLs and Their Potential Application in Deep Underground Coal Mine

et al. 2021

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“…Qiao [23] investigated cube samples containing glass fiber, and the results indicated that samples with fiber are stronger than those without fiber. In another study [24], the shear strength of the polymer material Appl. Sci.…”

Section: Fiber-reinforced Materials and Fiber-reinforced 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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“…As coating materials are relatively thin, the support mechanism provided by TSLs has been under intensive investigation. To date, numerous experimental tests have been conducted at the UoW Rock Mechanics Laboratory and a series of test results has been reported (Nemcik et al, 2013a(Nemcik et al, , 2013bPorter et al, 2014;Qiao et al, 2014aQiao et al, , 2014b.…”

Section: Introductionmentioning

confidence: 99%

Laboratory investigation of support mechanism of thin spray-on liner for pillar reinforcement

Qiao

Nemcik

Porter

et al. 2014

Géotechnique Letters

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Thin spray-on liners (TSLs) are attracting attention as effective rock support reinforcement in underground mines. They have the potential to increase roadway development rates and provide resistance at small rock surface displacements. To study the reinforcement provided by a TSL when applied onto a pillar surface, the support mechanism of TSL-coated rock samples was investigated, thereby providing a basis for studying the effect of TSL confinement on rock pillars. A polymeric material liner was applied to three types of rock (siltstone, sandstone and granite), and details of the sample preparation and loading procedures are presented. The results of rock failure tests indicate that significant strength improvement and enhancement of post-failure characteristics developed for the TSL-encapsulated samples. TSL reinforcement of the weaker rocks appears to be better than that of the stronger rocks. It is concluded that effective rock reinforcement occurs in the case when the tensile strength of the TSL material is greater than the tensile strength of the rock; the TSL reinforcement of stronger rock types may not be as effective. The test results obtained are consistent and conclusive.

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Shear strength testing of glass fibre reinforced thin spray-on liner

Cited by 10 publications

References 3 publications

Laboratory Study of Deformation Behaviour of Two New Reinforcing Polymeric TSLs and Their Potential Application in Deep Underground Coal Mine

Laboratory Study of Deformation Behaviour of Two New Reinforcing Polymeric TSLs and Their Potential Application in Deep Underground Coal Mine

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

Laboratory investigation of support mechanism of thin spray-on liner for pillar reinforcement

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