Advanced Testing and Characterization of Interlayer Shear Resistance

Canestrari, Francesco; Ferrotti, Gilda; Partl, Manfred N.; Santagata, Ezio

doi:10.1177/0361198105192900109

Cited by 96 publications

(44 citation statements)

References 2 publications

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“…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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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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show abstract

“…Bond strength has been reported to significantly decrease as temperature increases (Sholar et al 2002;West et al 2005;Leng et al 2008) such that at relatively high temperatures the contribution by tack coat adhesion to the bond strength essentially becomes insignificant as compared to the shear resistance provided by layer surface roughness. Other laboratory studies on tack coated surfaces versus uncoated surfaces suggested that the tack coat adhesion is generally smaller than the shear resistance provided by layer surface roughness (Canestrari et al 2005;Mohammad et al 2005), especially where surrounding surfaces are composed of comparatively coarse grain aggregates (Sholar et al 2002;West et al 2005). The impact on the bond strength of the tack coat type and application rate has been found to vary from negative, to insensitive, and to positive, based on the asphalt materials and testing conditions (Uzan et al 1978;Mohammad et al 2005;Leng et al 2008).…”

Section: Introductionmentioning

confidence: 97%

“…The most popular types of direct shear interlayer tests include the Leutner shear test (Leutner 1979) (which has been incorporated into the Swiss Standard SN 671961), the Layer-Parallel Direct Shear (LPDS) test (developed by Swiss Federal Laboratories for Materials Science and Technology -EMP), the shearing apparatus developed by the Florida Department of Transportation (FDOT) (Sholar et al 2002), Nottingham shear box, and the Ancona Shear Testing Research and Analysis (ASTRA) developed at Universita Politecnica delle Marche (Canestrari et al 2005). Although each test has shown reasonable outcomes, the wide variety of shear mechanisms involved in various tests has made comparison among different test values particularly difficult.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Interaction between Geosynthetic Reinforcements and Hot Mix Asphalt

Roodi

Morsy

Zornberg

2017

Airfield and Highway Pavements 2017

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The advent of interlayer reinforcements with a wide range of stiffness properties has provided the opportunity to produce a specially-designed composite material that can enhance pavement performance in various aspects (e.g., rutting, fatigue cracking, reflective cracking). However, reinforcements may negatively affect the bonding between asphalt layers. The objective of this paper is to evaluate experimentally the interlayer de-bonding effect. In particular, reinforced and unreinforced asphalt specimens were tested in a direct shear test setup and their interlayer bond strength was characterized. The reinforcement inclusions used in the testing program involved synthetic materials made from various polymers, including polyester, polyvinyl alcohol, and glass fiber. Results of the experimental program indicated that the de-bonding effect impacts not only the maximum bond strength, but also the stiffness and the average interlayer shear strain at the maximum bond strength. Moreover, coverage ratio and the thickness of the reinforcement yarns were identified as additional important parameters in characterization of the interlayer debonding effect. Airfield and Highway Pavements 2017 428 © ASCEAirfield and Highway Pavements 2017 Downloaded from ascelibrary.org by University of Texas at Austin on 10/04/17.

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“…6,7 Tight bond of new and old cement concrete pavement is the key to exert the original bearing capacity of old cement concrete pavement and reduce the thickness of overlay. 8,9 Yan et al 10 analyzed the consequences of interface bond on overlay performance, the results indicated that the poor interface bond can increase deflection and tensile stress, more attention should be paid to the interface bond during overlay design and construction. Newbolds et al 11 evaluated the influence of bond condition on the performance of ultra thin whitetopping pavements; the results indicated that the interfacial bond conditions did affect the strain distribution and maximum load-induced strains.…”

Section: Introductionmentioning

confidence: 99%

Influence of fiber grid on interlayer bond property of airport double-layer pavement

Yan

Weng

Kou

2013

Journal of Reinforced Plastics and Composites

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In order to study the interlayer bond property of airport double-layer pavement, the cement concrete cube splitting tensile test and double-layer beam test were conducted. The bond mechanism of fiber grid and airport double-layer pavement was analyzed. The deflection and strain of upper and lower beams of double-layer beam were measured. The splitting tensile strength of new and old cement concrete cubes, the strain ratio, deflection difference and coupling coefficient of the double-layer beam were taken as criteria for the interlayer bond property of airport double-layer pavement. The result demonstrates that the splitting tensile strength is maximal when the basalt fiber grid with dimension of 5 mm was adopted, the old cement concrete and fiber grid surface treatment have great influence on splitting tensile strength, but the maximum grain size of coarse aggregate have few influence on it. The friction between doublelayer beam reduces the strains of the bottom of the lower and upper beams by 44.44-98.46%. The fiber grid and old cement concrete surface treatment not only increase the coupling coefficient with the range of 4.60-15.73% but also decrease the deflection difference, the number of which ranges from 0.004 mm to 0.016 mm, thus improve the integral force performance and deformation ability of double-layer beams.

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Advanced Testing and Characterization of Interlayer Shear Resistance

Cited by 96 publications

References 2 publications

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

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

Experimental Evaluation of the Interaction between Geosynthetic Reinforcements and Hot Mix Asphalt

Influence of fiber grid on interlayer bond property of airport double-layer pavement

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