Experimental and numerical analysis of effect of curing time on mechanical properties of thin spray-on liners

Download
index.pdf
2014
Güner, Doğukan
Show full item record
294
views
129
downloads
This research study investigates the effect of curing time on elastic material properties (Young’s modulus, Poisson’s ratio) and tensile, compressive strength of thin spray on liners (TSL). TSLs are fast curing, comparatively thin (3-5mm) and widely used rock support system in mining and civil engineering excavations. They have advantages of low volume, rapid application and low operating cost. The major ingredients of current TSLs are divided as polyurethane/ polyurea or Portland cement based latex products. One of the important parameters that control the support mechanisms of TSLs’ is the tensile and compression strength behaviour of them. There are many different testing set-ups and tests have been conducted considering the physical properties of them. In this study, two different TSL products supplied by two TSL manufacturers are tested comparatively. During laboratory studies, samples that are prepared in the laboratory conditions with different curing times (1, 7, 14, 21 and 28 days) are tested based on ASTM standards. In addition, distinct element numerical modelling of the test results are carried out using PFC2D in an attempt to simulate the tests numerically, since the constitutive behaviour of the TSLs are yet to be determined. It is concluded that the increase in the curing time improves the tensile and compressive strength of the TSLs (2 to 9 times). Moreover, as an extra conclusion from the testing procedure, the difference between the common malpractices of measuring the sample displacement from the grips of the loading machine versus from the sample’s gauge length is observed to be significant (1 to 13 times). In addition, PFC numerical models with the tests enabled the derivation of two important parameters of TSLs; such as, bond strength and bond elastic modulus values of TSLs which can be used for numerical modelling of TSLs` support mechanisms in PFC by the researchers.
Thin Spray-on liner., Discrete element method., Adhesion., Particles.
http://etd.lib.metu.edu.tr/upload/12617637/index.pdf
https://hdl.handle.net/11511/23763
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Experimental and Numerical Analysis of the Effects of Curing Time on Tensile Mechanical Properties of Thin Spray-on Liners
Guner, Doğukan; Öztürk, Hasan (2016-08-01)
The effects of curing time on tensile elastic material properties of thin spray-on liners (TSLs) were investigated in this study. Two different TSL products supplied by two manufacturers were tested comparatively. The "dogbone" tensile test samples that were prepared in laboratory conditions with different curing times (1, 7, 14, 21, and 28 days) were tested based on ASTM standards. It was concluded that longer curing times improves the tensile strength and the Young's Modulus of the TSLs but decreases thei...
Computational elastodynamics of functionally graded thick-walled cylinders and annular coatings subjected to pressure shocks
Abeidi, Abdelrahim; Dağ, Serkan (2022-12-01)
A computational technique based on domain-boundary element method (D-BEM) is developed for elastodynamic analysis of functionally graded thick-walled cylinders and annular coatings subjected to pressure shock type of loadings. The formulation is built on the wave equation, which is derived in accordance with plane elastody-namics. Weighted residual statement for the wave equation is expressed by using the static fundamental solution as the weight function. Applying integration by parts and incorporating the...
Effects of RTM mold temperature and vacuum on the mechanical properties of epoxy/glass fiber composite plates
Kaynak, Cevdet; Isitman, Nihat Ali (2008-08-01)
The purpose of this study is to investigate the effects of mold temperature, application of vacuum at resin exit ports, and initial resin temperature on the mechanical properties of epoxy matrix woven glass fiber reinforced composite specimens produced by resin transfer molding (RTM). For this purpose, six mold temperatures (25, 40, 60, 80, 100, and 120 degrees C), two initial resin temperatures (15 and 28 degrees C), and vacuum (0.03 bar) and without vacuum (similar to 1 bar) conditions are utilized. Speci...
Effects of glass fiber reinforcement and thermoplastic elastomer blending on the mechanical performance of polylactide
Varsavas, S. Deniz; Kaynak, Cevdet (2018-06-01)
The purpose of this study was to investigate how optimum mechanical properties (strength-modulus-toughness) of inherently very brittle polylactide (PLA) could be obtained by reinforcing with E-glass fibers (GF) and blending with thermoplastic polyurethane elastomer (TPU). Composites and blends were compounded by twin-screw extruder melt mixing, while specimens were shaped by injection molding. SEM analyses revealed that 15 wt% GF and 10 wt% TPU domains, alone and together, could be uniformly distributed in ...
Numerical and experimental investigation of quench process
Gür, Cemil Hakan; Ozturk, T (1996-11-07)
Numerical and experimental studies have been carried out to investigate the evolution of residual stresses in quenched components induced by temperature gradient and phase transformations. In the numerical analysis, a finite element model is implemented for predicting the temperature field, phase changes with their associated internal stresses in axisymmetrical steel components. The model is verified by several comparisons with other known numerical results. Case studies are performed to investigate the eff...
Citation Formats
D. Güner, “Experimental and numerical analysis of effect of curing time on mechanical properties of thin spray-on liners,” M.S. - Master of Science, Middle East Technical University, 2014.
METU IIS - Integrated Information Service open@metu.edu.tr