1. Investigation of texture effects at interlayer bonding behavior between asphalt concrete (AC) overlay on Portland cement concrete (PCC)
- Author
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Hwang, Hyun-Sik, Ryu, Sung-Woo, Oh, Ju-Sam, and Cho, Yoon-Ho
- Subjects
Asphalt -- Mechanical properties ,Portland cement -- Mechanical properties ,Engineering and manufacturing industries - Abstract
Slippage cracking in asphalt overlays occurs because of bonding failure between the asphalt concrete and Portland cement concrete layers. A direct shear test was adopted to simulate common and critical bonding failures. The effects of temperature and tack coat have already been studied by previous researchers; however, the effects of texture have not been sufficiently considered. In this study, clamping shear strength was used to characterize the pure shear strength of the pavement. It is defined as the difference between the total shear strength and plane shear strength. The results indicated that the interlayer behaved in an elastic manner at lower temperatures, generating brittle failures with cracking, whereas viscoelastic behavior dominated at higher temperatures, producing ductile failure that led to slippage at the interface layer. The surface texture effects can be quantitatively characterized using the clamping shear strength. In addition, the clamping shear strength can be used to optimize the asphalt mixture to enhance the bonding performance. Key words: asphalt concrete (AC) overlay, interlayer bonding failure, clamping strength, texture, Portland cement concrete (PCC) rehabilitation. La fissuration parabolique de glissement des couches d'asphalte se produit a la suite d'une defaillance de l'adherence entre les couches de beton asphaltique (BA) et le beton de ciment Portland (BCP). Un essai de cisaillement direct a ete adopte pour simuler la defaillance d'adherence commune et critique. Les effets de la temperature et de la couche d'adherence ont deja ete etudies par des chercheurs precedents, mais les effets de la texture n'ont pas ete suffisamment pris en compte. Cette etude a utilise la resistance au cisaillement de serrage pour caracteriser la resistance au cisaillement pure dans la chaussee. Elle est definie comme la difference entre la resistance totale au cisaillement et la resistance au cisaillement normale. Les resultats ont montre que l'inter couche s'est comportee de maniere elastique a des temperatures plus basses, generant des ruptures fragiles avec fissuration, tandis que le comportement viscoelastique a domine a des temperatures plus elevees, produisant une rupture ductile qui conduit au glissement a la couche d'interface. Les effets de texture de surface peuvent etre caracterises quantitativement en utilisant la resistance au cisaillement de serrage, et cette resistance peut etre utilisee pour optimiser le melange d'asphalte dans l'amelioration des performances de l'adherence. [Traduit par la Redaction] Mots-cles : rechargement de beton asphaltique (BA), defaillance de l'adherence entre les couches, force de serrage, texture, readaptation du beton de ciment Portland (BCP)., Introduction Asphalt concrete (AC) overlay is one of the most typical pavement maintenance strategies used in Portland cement concrete (PCC) pavements to extend their service life. The life of an [...]
- Published
- 2022
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