Evaluating Tack Coat Applications and the Bond Strength between Pavement Layers

“…Researchers have shown that loss of bond could reduce the life of a pavement from 20 years to 7 or 8 years. A 50% reduction in fatigue life might be the result of a 10% decrease in bond strength (West, Zhang, and Moore 2005). Other studies have shown that the fatigue life reduction for a fully debonded pavement could be much more drastic and could prompt the need for repairs such as full-depth patches or complete reconstruction (Romanoschi andMetcalf 2001a, 2001b).…”

Section: Problem Statementmentioning

confidence: 99%

“…This distress develops in areas where braking, accelerating, or turning wheels move and deform the surface layer of the HMA structure (West, Zhang, and Moore 2005;Romanoschi and Metcalf 2001a). Slippage can be seen on the pavement surface in the form of half-moon-shaped cracks with the ends pointing toward the traffic direction.…”

Section: Problem Statementmentioning

confidence: 99%

Nondestructive Testing to Identify Delaminations Between HMA Layers, Volume 1 - Summary

Heitzman¹,

Maser²,

Tran³

et al. 2013

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Several types of pavement surface distress can be attributed to delamination between hot-mix asphalt (HMA) layers. Longitudinal cracking in the wheel path and tearing in the surface are two common types of visual distress that are caused by delamination between layers. HMA delamination is primarily due to layer debonding or stripping. Debonding occurs when there is improper tack between paved HMA layers or between an HMA overlay and concrete pavement. Stripping develops when the aggregates and asphalt binder are incompatible, adhesion is lost, and water separates the asphalt binder from the aggregate. These conditions that cause pavement distress cannot be detected by visual inspection of the pavement, particularly in the early stages of the problem. The distress-cracking or tearing-are the first indicators that delamination may be occurring within the pavement layers. Agencies that maintain a roadway network need a test method to detect the location and severity of delamination before the pavement deficiency causes visual pavement distress. The test method should be applicable to network-level pavement condition assessment, projectlevel design investigation to select the correct rehabilitation strategy, and construction quality assurance. Coring is often used to measure the depth, type, and severity of delamination after the visual distress appears. This test method is destructive and is not suitable for effective evaluation of long lengths of pavement. Nondestructive testing (NDT) methods are needed to identify the presence, location (depth and area), and severity of delamination in a rapid, effective manner. The objectives of this second Strategic Highway Research Program (SHRP 2) study were to determine which NDT technologies could detect delamination and further to develop the most promising methods to accomplish construction, project design, and network-level evaluations. NDT technology for construction quality assurance should have the ability to detect debonding after placement of an HMA lift. NDT technology for project-level investigation should have the ability to provide a detailed identification of the location and severity of delamination. NDT technology for networklevel assessment should have the ability to detect the presence of delamination with the test equipment operating full-lane width at safe vehicle speed. Disciplines Civil and Environmental Engineering T R A N S P O R T A T I O N R E S E A R C H B O RepoRt S2-R06D-RR-1 The Second S T R A T E G I C H I G H W A Y R E S E A R C H P R O G R Copyright InformationAuthors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who own the copyright to any previously published or copyrighted material used herein.The second Strategic Highway Research Program grants permission to reproduce material in this publication for classroom and not-for-profit purposes. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, or FH...

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“…The finding of a correlation between the interface shear strength and the surface features was confirmed by D'Andrea and Tozzo (2013) testing the interface shear strength of double layer asphalt specimens where the surface of the binder was treated in different ways to improve the roughness. West et al (2005) also proved higher bond strengths for fine-graded mixtures than for the coarse-graded ones, considering the results of laboratory fabricated specimens and field experiments. The significant interactions of the mix type with other variables e.g.…”

Section: Introductionmentioning

confidence: 99%

Interface Roughness Parameters and Shear Strength

D’Andrea

Tozzo

Boschetto³

et al. 2013

MAS

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The interlayer bond strength between binder and wearing course and several possible treatments of enhancing the contact surface roughness and the interlocking are investigated. For this purpose, conventional methods, such as shear tests, but also laser image acquisition of the binder upper surface have been used. The mechanical outcomes of a shear test device and the binder surface roughness parameters, have been compared looking for a relation between the shear performance and the surface characteristics. The comparison between the roughness average and the root mean square of the profile heights with the maximum shear stress shows the achievement of the same strength level for treatments with similar roughness parameters, as proved by the statistical analysis. Furthermore, the comparison between the roughness parameter kurtosis and the maximum height of the profile with the slope of the response curve before the peak and residual shear stress, demonstrates a better locking for more high peaks.

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Evaluating Tack Coat Applications and the Bond Strength between Pavement Layers

Cited by 68 publications

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Sczepność Międzywarstwowa W Nowobudowanych Nawierzchniach W Polsce

Sczepność Międzywarstwowa W Nowobudowanych Nawierzchniach W Polsce

Nondestructive Testing to Identify Delaminations Between HMA Layers, Volume 1 - Summary

Interface Roughness Parameters and Shear Strength

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