Test Method for Comparing Bond Strength of Steel Reinforcing Bars to Concrete Using Beam-End Specimens

A wedged load test method is used to evaluate the adhesion strength of high-strength coatings, which have been processed with various sintering parameters. In this test, for stress concentration at cut tip, cracks are always induced and expanded rapidly cross the interface between coating and substrate. Macro-fracture and SEM image of coating interface of high-strength coating are characterized using optical microscope and scanning electron microscopy (SEM), respectively. In order to evaluate the bonding properties between coating and substrate effectively, corresponding finite element (FE) analysis has been conducted to evaluate the adhesion strength of high-strength coating. And stress distributions cross the interface of high-strength coating are obtained. The stress analysis can help to evaluate the bond strength of high-strength coating. Because of small specimen and contact relationship between wedged pressure head and wedged cuts, complex stress state is affected by many factors resulting from interface, and also by the thickness of coating.

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Size Effect on the Bond Behavior of Grouted Reinforcing Bars Embedded in Light-weight Concrete

10.24086/aces2020/paper.220 ◽

2021 ◽

Author(s):

Aamer Abbas ◽

◽

Yaqoob Yaqoob ◽

Ola Hussein ◽

Ibrahim Al-Ani ◽

...

Keyword(s):

Bond Strength ◽

Concrete Specimen ◽

Light Weight ◽

Reinforcing Bars ◽

Conventional Concrete ◽

Bond Behavior ◽

Pull Out ◽

Specimen Width ◽

Light Weight Concrete ◽

The Relationship

This study presents experimentally the bond behavior of light-weight concrete specimens with grouted reinforcing bars in comparison with conventional concrete specimens. A total of (9) pull-out specimens were studied; (3) specimens of conventional concrete, (3) specimens of light-weight concrete, and other (3) specimens of grouted light-weight concrete. Two variables are adopted in this investigation: specimen width and type of concrete (conventional concrete, light-weight concrete and grouted light-weight concrete). The study contains a discussion of the general behavior of the specimens in addition to the study of the ultimate bond capacity, maximum bond stresses and the relationship between the stress and the slip for different pull-out specimens. Results show that bond strength is highest for the largest specimen size (bond strength of grouted light-weight concrete specimen with specimen width 400 mm is higher than that of the specimen with (200 mm) width by about (13.13%)). Also, bond strength is highest for the grouted light-weight concrete specimen (bond strength of grouted light-weight concrete specimen is higher than conventional concrete specimen by (11.11%)).

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Experimental and analytical study on bond strength of normal uncoated and epoxy-coated reinforcing bars

Construction and Building Materials ◽

10.1016/j.conbuildmat.2018.09.010 ◽

2018 ◽

Vol 189 ◽

pp. 612-628 ◽

Cited By ~ 2

Author(s):

Xiao-Hui Wang ◽

Bing Chen ◽

Peng Tang

Keyword(s):

Bond Strength ◽

Analytical Study ◽

Reinforcing Bars

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Wire Adhesion Testing

Rubber Chemistry and Technology ◽

10.5254/1.3544696 ◽

1972 ◽

Vol 45 (1) ◽

pp. 16-25 ◽

Cited By ~ 3

Author(s):

L. C. Coates ◽

C. Lauer

Keyword(s):

Bond Strength ◽

Physical Properties ◽

Test Method ◽

Material Strength ◽

Basic Design ◽

Rubber Compound ◽

Reliable Test ◽

Adhesion Testing ◽

Rubber Compounds ◽

The Relationship

Abstract The results of this study are conclusive. The ASTM D-2229 Test Method is not a reliable test for measuring adhesion of wire cords to rubber compounds. However, by using the basic design and modifying it, an accurate measurement of bond strength on a macroscopic level can be obtained. This test is insensitive for all practical purposes to compound physical properties and changes in cord diameter and embedded length—for both stranded and rod-like cords. It is also possible with this test to calculate the amount of stress that is exerted on the surface of the wire cord to determine the relationship between failing stress and the material strength of the rubber compound. Properly used, this new test should give the compounder a better tool to study the adhesion of compounds to metal.

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