Thermoviscoelastic Analysis and Creep Testing of Ambient Temperature Cure Epoxies Used in Adhesive Anchor Applications

Chin, Jik; Forster, Aaron M.; Ocel, Justin; Hartmann, Joseph; Fuchs, P. A.; Hunston, Donald L.

doi:10.1061/(asce)mt.1943-5533.0000108

Cited by 16 publications

(12 citation statements)

References 5 publications

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“…3.2-Analytical approach with imposed displacement mode This section tends to adapt the shear-lag equations in order to study the stress distribution generated by an imposed displacement at the beginning of the anchor. Therefore, the solutions of the shear-lag differential equations become dependent on the boundary condition applied at the beginning of the anchor, as described by equation (30).…”

Section: 1-analytical Approachmentioning

confidence: 99%

“…7 c) show that the temperature increase leads to increase the anchor slip. Indeed, this can be explained by the fact that the anchor temperature increase leads to a decay in the mechanical properties of the resin, such as its shear modulus [28] [30], which therefore leads to decrease the anchor stiffness. Consequently, the temperature increase leads to increase the anchor slip.…”

Section: 4-temperature Effect On the Stress Distribution Profilementioning

confidence: 99%

See 1 more Smart Citation

A nonlinear shear-lag model applied to chemical anchors subjected to a temperature distribution

Lahouar

Pinoteau

Caron

et al. 2018

International Journal of Adhesion and Adhesives

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Adhesive joints are increasingly used in bridges and buildings construction thanks to their high mechanical properties and their ease of implementation. However, the load transfer mechanism within adhesive joints is complex and has been the subject of several studies since 1938. Several models have been developed to quantify the stress distribution along bond joints. Nevertheless, very few models exist today to study the stress distribution in chemical anchors by taking into account the temperature effect. This paper presents a non-linear shear-lag model adapted to chemical anchors allowing predicting their stress distribution profiles and fire resistance duration for any temperature distribution. The model highlights the importance of the temperature distribution on the stress profile. The paper shows that when the anchor reaches its maximum axial force, all the elements composing the anchor provide their maximum performance at the same time.

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Section: 1-analytical Approachmentioning

confidence: 99%

Section: 4-temperature Effect On the Stress Distribution Profilementioning

confidence: 99%

A nonlinear shear-lag model applied to chemical anchors subjected to a temperature distribution

Lahouar

Pinoteau

Caron

et al. 2018

International Journal of Adhesion and Adhesives

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“…[3,4] In addition, ambient temperature-cure epoxy structural adhesives have been increasingly demanded in structural applications. [5,6] One of the main ingredients in commercialized epoxy adhesives is diglycidyl ether of bisphenol A (DGEBA), which is a low-viscosity liquid possessing good wetting capability, good chemical resistance, and good physical properties. DGEBA possesses broad curing temperatures, depending on curing agents.…”

Section: Introductionmentioning

confidence: 99%

Epoxy‐based composite adhesives with improved lap shear strengths at high temperatures for steel‐steel bonded joints

Chailee

Parnklang

Mora

et al. 2020

J of Applied Polymer Sci

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High‐performance room temperature‐cure epoxy structural adhesives utilizing simplified formulation are developed. The developed structural adhesive consists of diglycidyl ether of bisphenol A (DGEBA) and novolac epoxy blend as a base resin, micrometer‐sized silica particles as a reinforcing filler, and triethylenetetramine as a curing agent. The developed ambient temperature‐cure epoxy structural adhesive with optimized formulation exhibits outstanding properties including high glass transition temperature of 95°C, high thermal stability with degradation temperature at 5% weight loss of 364°C, exceptionally high rubbery plateau modulus of 320 MPa, good flame‐retardant characteristics with limiting oxygen index of 40, and high single lap shear strength for single lap steel‐steel bonded joint of 548 MPa at the temperature of 80°C. The silica‐filled DGEBA/novolac epoxy composite adhesive is a potential candidate for applying as a structural adhesive for construction with long‐term durability.

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“…In recent years, rock anchoring has become increasingly popular in roadway excavation and reinforcement, thanks to its strong ability to improve the stress state on roadway surface. Engineering practice has shown that rock bolting is more effective in enhancing roadways than metal support, wood support and joint support [3][4]. Being the most widely used mode of rock anchoring, resin anchoring embeds the anchor into the surrounding rock of the roadway, and bonds it with the rock by unsaturated polyester [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Engineering practice has shown that rock bolting is more effective in enhancing roadways than metal support, wood support and joint support [3][4]. Being the most widely used mode of rock anchoring, resin anchoring embeds the anchor into the surrounding rock of the roadway, and bonds it with the rock by unsaturated polyester [4][5][6][7][8][9]. Compared with cement mortar and other rock anchoring materials, the resin material solidifies fast, realizes efficient support, and facilitates construction [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Reliability of Anchoring Resin under Thermomechanical Coupling

Wang¹,

Feng²

2019

IJHT

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This paper attempts to disclose the mechanical behavior and deformation performance of the resin anchor of the roadway in high temperature, deep mines, under the coupling between stress and temperature. Drawing on the relevant theories on thermomechanical coupling, this paper tests the strength, elastic modulus, Poisson's ratio and rheological performance of the anchoring resin under thermomechanical coupling, and compares the pull-out and rheological performances of the resin anchored layer under different temperatures and stresses. The results show that: With the increase in test temperature, the anchoring resin witnessed a gradual decline in its compressive strength and yield stress, a continuous decrease of its elastic modulus, a gradual growth in the Poisson's ratio, and a reduction in the yield point; The rheological deformation of the anchoring resin is affected by test temperature and stress; There is a negative correlation between the ambient temperature and the pull-out force needed to displace the anchoring resin by a certain distance, under the high temperature environment; In high-temperature, deep mines, anchoring resin is significantly affected by the ambient temperature and stress. The research findings lay the theoretical basis for the advancement of roadway support technique in deep mines under thermomechanical coupling.

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Thermoviscoelastic Analysis and Creep Testing of Ambient Temperature Cure Epoxies Used in Adhesive Anchor Applications

Cited by 16 publications

References 5 publications

A nonlinear shear-lag model applied to chemical anchors subjected to a temperature distribution

A nonlinear shear-lag model applied to chemical anchors subjected to a temperature distribution

Epoxy‐based composite adhesives with improved lap shear strengths at high temperatures for steel‐steel bonded joints

Mechanical Behavior and Reliability of Anchoring Resin under Thermomechanical Coupling

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