Evaluation of Construction Practices That Influence the Bond Strength at the Interface between Pavement Layers

Tashman, Laith; Nam, Kibo; Papagiannakis, A. T.; Willoughby, Kim; Pierce, Linda M; Baker, Tom

doi:10.1061/(asce)0887-3828(2008)22:3(154)

Cited by 42 publications

(28 citation statements)

References 3 publications

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“…Research has proven that the degree of bond between pavement layers can significantly affect pavement performance (1). Poor bond has been known to decrease the structural bearing capacity of a pavement inducing pavement distresses and failures such as premature slippage cracking, top-down cracking, or fatigue cracking (1,2,3,4,5). These distresses prompt the need for extensive repairs such as full-depth patches or complete reconstruction (6,7).…”

Section: Introductionmentioning

confidence: 98%

Evaluation of Nanotechnology Additive on Tack Coat Moisture Resistance and Bond Strength

Willis¹,

Taylor²

2015

Airfield and Highway Pavements 2015

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This study evaluated the laboratory bond strength and moisture susceptibility of a nanotechnology (derived from organosilane) modified emulsion against a control CSS emulsion. This additive is designed to convert the surface of the treated material (untreated aggregate, soil, or HMA) from a water loving (hydrophilic) surface to a water repelling (hydrophobic) surface while providing equivalent bond strength compared to an unmodified emulsion with a higher residual AC content. Two-layer slabs were produced in the laboratory with the following variables: emulsion type, surface type (new HMA or milled), and application rate (three different rates). Cores were obtained from each slab to evaluate the effect of the critical variables using a monotonic shear bond strength test. The results of the bond strength evaluation showed the modified emulsion provided equivalent bond strength to a control emulsion with 3 times the residual AC content. Additionally, an experimental evaluation was conducted to assess the moisture susceptibility of the tack coat materials. Additional slabs were fabricated at the optimum application rate for each surface type and emulsion application. The AASHTO T283 procedure was utilized to condition these specimens with one or two freeze-thaw cycles prior to determining their bond strength. The results of this evaluation were mixed. The data suggested moisture damage was occurring in the new HMA surface specimens, but not in the specimens with a milled surface interface. For the new HMA specimens, the control and nanotechnology modified emulsions had equivalent resistance to moisture damage as freeze-thaw cycles were applied to the specimens.

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Section: Introductionmentioning

confidence: 98%

Evaluation of Nanotechnology Additive on Tack Coat Moisture Resistance and Bond Strength

Willis¹,

Taylor²

2015

Airfield and Highway Pavements 2015

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“…These parameters include the type of emulsion used, dosage applied, binder-aggregate adhesion in the interface or setting time of the emulsion [4,5,6,7,8,9,10,11,12]. Some authors have further evaluated the importance of surface conditions on pavements, such as the degree of surface dust particles or the level of surface texture, which highly influences the final bond degree between layers, in some cases more than the characteristics of the emulsion [2,8,11,13]. Raposeiras et al [8] indicate that the surface macro-texture of the layer influences slippage resistance between pavement layers bonded by a tack coat.…”

Section: Introductionmentioning

confidence: 99%

Development of an estimative model for the optimal tack coat dosage based on aggregate gradation of hot mix asphalt pavements

Raposeiras

Rojas-Mora

Piffaut

et al. 2016

Construction and Building Materials

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“…It has been shown that the bond between pavement layers and the integrity of each layer are necessary and that, if not present, result in shorter service life due to reduction of the total pavement strength, slippage, top-down cracking, and potential water damage (Van Dam et al 1987;Ziari and Khabiri 2007;Leng et al 2008;Tashman et al 2008). Discontinuities in HMA pavements resulting from layer debonding or stripping often cause slippage cracking and damage to the structural integrity of the pavement.…”

Section: Problem Statementmentioning

confidence: 99%

“…Construction miscues, such as mixture segregation and thermal (density) segregation, are common discontinuities in pavement structures that have been linked to delamination. Other construction-or design-related issues, such as paving thin lifts of HMA, improper cleaning of surfaces, excessive or inadequate tack coat, introducing water onto an HMA lift surface, improper compacting of the upper lifts, and using water sensitive aggregate in the old pavement surface, have all been shown to reduce the bond strength of an HMA pavement (Tashman et al 2008;Mejia et al 2008;Canestrari et al 2005).…”

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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Evaluation of Construction Practices That Influence the Bond Strength at the Interface between Pavement Layers

Cited by 42 publications

References 3 publications

Evaluation of Nanotechnology Additive on Tack Coat Moisture Resistance and Bond Strength

Evaluation of Nanotechnology Additive on Tack Coat Moisture Resistance and Bond Strength

Development of an estimative model for the optimal tack coat dosage based on aggregate gradation of hot mix asphalt pavements

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

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