1. Investigation on high-temperature performance of waste-based high-viscosity asphalt binders (WHABs) by repeated creep recovery (RCR) test
- Author
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Cai, Jun, Wang, Yansong, Wang, Di, Li, Rui, Zhang, Jiupeng, and Pei, Jianzhong
- Subjects
Asphalt cement -- Materials -- Thermal properties -- Testing ,Dynamic testing (Materials) -- Methods ,Engineering and manufacturing industries - Abstract
This study reviewed and compared the test methods for the high-temperature performance of asphalt binder, and selected repeated creep recovery (RCR) test to evaluate the high-temperature performance of three waste-based high- viscosity asphalt binders (WHABs, including D-I, D-II, and F) and a control sample (Tafpack-Super modified asphalt, TMA). Meanwhile, shear stress, test temperature, and aging degree of binders, which could influence high-temperature behavior of binders, were also investigated, and related evaluation indexes including recovery compliance (R), non-recoverable creep compliance [J.sub.nr]), and viscous stiffness modulus ([G.sub.v]) were compared. Results show that WHABs has much better high-temperature performance than TMA; shear stress has the most prominent effect on binders' high-temperature performance, followed by aging degree, and lastly the selected test temperature in y-time curve results; R, [J.sub.nr], and [G.sub.v] values results indicate aging degree has a significant effect on binders, and improving binders' aging performance can greatly improve the high-temperature performance. Key words: high-temperature performance, waste-based high-viscosity asphalt binders (WHABs), Tafpack-Super modified asphalt (TMA), repeated creep recovery (RCR) test, aging. Cette etude a examine et compare les methodes d'essai du rendement a haute temperature d'un liant d'asphalte, ainsi que certains essais de recuperation au fluage repete (RFR) pour evaluer le rendement a haute temperature de trois liants d'asphalte a haute viscosite a base de residus (<>, y compris D-I, D-II et F) et d'un echantillon temoin (asphalte modifie Tafpack-Super<>). De plus, on a etudie la contrainte de cisaillement, la temperature d'essai et le degre de vieillissement des liants, des parametres qui pourraient influer sur le comportement a haute temperature des liants, et on a compare les indices devaluation connexes, y compris la souplesse a la recuperation (R), la souplesse non recuperable au fluage [J.sub.nr]) et le module de rigidite visqueuse ([G.sub.v]). Les resultats montrent que les WHAB ont un bien meilleur rendement a temperature elevee que le TMA; la contrainte de cisaillement a l'effet le plus important sur le rendement des liants a haute temperature, puis sur le degre de vieillissement et sur la derniere temperature d'essai choisie dans les courbes y-temps. Les valeurs R, [J.sub.nr] et [G.sub.v] indiquent que le degre de vieillissement a un effet important sur les liants, et l'amelioration du rendement des liants en matiere de vieillissement peut grandement ameliorer le rendement a haute temperature. [Traduit par la Redaction] Mots-cles : rendement a haute temperature, liants d'asphalte a haute viscosite a base de residus (<< WHAB >>), asphalte modifie Tafpack-Super <>, essai de recuperation au fluage repete (RFR), vieillissement., Introduction As one of the most important properties for asphalt pavement, high-temperature performance reflects the ability of asphalt pavement to withstand long-term vehicle loads and pavement diseases like rut-resistance in [...]
- Published
- 2019