Investigation of Bonding between Asphalt Layers on Road Construction

Tschegg, E. K.; Kroyer, G; Tan, Dong-Ming; Stanzl-Tschegg, Stefanie E.; Litzka, J

doi:10.1061/(asce)0733-947x(1995)121:4(309)

Cited by 65 publications

(18 citation statements)

References 5 publications

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“…Particularly interesting are samples consisting of two materials bonded together along the prospective crack line. For example the toughness of the bond between two types of asphalt was measured as a function of temperature [28]. Additional compressive stresses parallel to the crack can be applied to measure the fracture toughness under biaxial loading conditions [29].…”

Section: Wedge Splitting Methodsmentioning

confidence: 99%

Fracture Toughness Tests

Zehnder

2012

Fracture Mechanics

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To apply the theory developed in the previous chapters, fracture toughness values must be measured. A wealth of methods for the determination of critical values of the stress intensity factor, R-curve, energy release rate have been developed. A number of these fracture toughness test methods are described here. The choice of method to use will depend on the material being tested and on your goals. Methods that work for steel will not work for composite materials. If you need data for a critical application you'll want to use a standard, accepted test method. If you are developing a new material and want to determine toughness as part of the development or screening process you might choose another method.

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Section: Wedge Splitting Methodsmentioning

confidence: 99%

Fracture Toughness Tests

Zehnder

2012

Fracture Mechanics

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“…Moreover, the test machines proposed only reproduce some of those conditions. Many researchers have investigated the bond strength using several devices that activate different detachment modes: tensile test [30], torque test [7], direct shear test, with or without normal load [22], three-point shear test [23], four-point shear test [13] and others in situ or lab arrangements. Despite the fundamental importance of a correct assessment of interlayer bonding conditions, a correlation and/or harmonization among test methods is still lacking [20].…”

Section: Introductionmentioning

confidence: 99%

Dynamic tests on bituminous layers interface

D’Andrea

Tozzo

2015

Mater Struct

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The most common test used to evaluate the interface bond strength of asphalt pavements is the guillotine direct shear test working in monotonic modality. Under this test configuration the specimen reaches failure in a mode very different from those activated in an actual pavement. In fact, the repetitive loading applied by vehicles is considerably lower than the interface resistance measured by a monotonic test. Moreover, the stress paths imposed to the specimen nowhere are experienced on field, in terms of ratio between shear and normal stresses and their variation during loading time. This study regards the dynamic performance of double-layered cylindrical specimens evaluated by a shear tester where the specimen is inclined so as to obtain contemporarily variations of the applied normal and shear stresses. Various inclinations are used to reproduce several combinations of these two stress components as they actually occur on field in those positions where the vehicle wheels generate a shear stress always in the same direction and proportional to the normal stress. As both normal and shear components influence the interface resistance to repetitive stress, a dynamic failure surface is assessed in the three-dimension space, with the two stress components as independent variables and the\ud number of cycles at failure as dependent variable

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“…This may be difficult to do correctly without causing eccentric loading that distort the test and, moreover, special clamps have to be made for this purpose. These problems could be avoided if indirect rather than direct tensile test were used, as the Wedge Splitting Test, developed by Tschegg et al (2,3), which applies a force to a dual layer specimen, by pushing a wedge into the interface between the two layers until they separate as a result of the horizontal component of the force.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Effect of Heat-Adhesive Emulsions for Tack Coats with Shear Test: From the Road Research Laboratory of Barcelona

Recasens

Martínez

Jimenez

2006

Transportation Research Record: Journal of the Transportation R

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The use of conventional emulsions for tack coats can cause problems as they frequently stick to the tires of construction vehicles. Consequently the bond between the asphalt layers is inadequate. The importance of tack coats in the performance of the pavement means that bituminous emulsions are constantly being improved. Recently, new types of emulsions have been developed from very low penetration bitumen that contains no flux. They are known as "heat-adhesive" emulsions and they are resistant to construction vehicles. The purpose of this study is to analyze the effect of different heat-adhesive emulsions and to verify their performance in service, in comparison with the response of a conventional emulsion. For this reason a new shear test -the LCB test-has been developed in the Road Research Laboratory of the Technical University of Catalonia. This test is carried out at different temperatures, both on laboratory specimens and on cores extracted from recently constructed pavements, where the same emulsions and dosages have been used. The application of the LCB test has shown that the performance of the different heat-adhesive emulsions mainly depends on the characteristics of the base bitumen and the kind of modifier used. At low temperatures, heat-adhesive emulsions reach, in general terms, lower shear resistances than conventional emulsions; however, at intermediate temperatures there are heatadhesives emulsions with both higher and lower strengths than those of the conventional emulsions.

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Investigation of Bonding between Asphalt Layers on Road Construction

Cited by 65 publications

References 5 publications

Fracture Toughness Tests

Fracture Toughness Tests

Dynamic tests on bituminous layers interface

Evaluation of Effect of Heat-Adhesive Emulsions for Tack Coats with Shear Test: From the Road Research Laboratory of Barcelona

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