Title
Chemo-Rheological Characterization of Aging Behaviors of Warm-Mix High-Viscosity Modified Asphalt
Author
Chen, Bei (Hohai University)
Dong, Fuqiang (Hohai University)
Yu, Xin (Changsha University of Science and Technology)
Ren, S. (TU Delft Pavement Engineering) 
Zheng, Changjiang (Hohai University)
Date
2022
Abstract
Today, high-viscosity modified asphalt (HVMA) is widely used in drainage asphalt pavements. However, due to its high construction temperature, HVMA is prone to thermal oxidative aging, which reduces its life cycle and increases the maintenance costs of asphalt pavements. In this study, the effects of warm-mix additives on the physical, rheological and chemical properties of HVMA were studied to determine optimum warm-mix conditions. First, the effects of warm-mix technologies (foam warm mix, Sasobit, Evotherm, and GLWBR at 3%, 3%, 0.8%, and 0.8%, respectively) on the physical and rheological properties of HVMAwere studied. Then, two aging methods [thin film oven test (TFOT) and pressure aging vessel (PAV)] were applied to simulate the short-term and long-term thermal oxidation processes of HVMA and evaluate the influences of different warm-mix technologies on HVMA aging. The results showed that the four warm-mix technologies, especially foam warm mix and Sasobit, reduced the construction temperature of HVMA. In addition, warm-mix technologies also improved the high-temperature rheological properties of HVMA; however, they had adverse effects on the low-temperature cracking resistance of asphalt. Based on asphalt aging index fluctuations, it was evident that warm-mix technology was not conducive to the antiaging performance of HVMA, and foam warm mix had the weakest influence on the antiaging performance of high-viscosity asphalts. Furthermore, according to the results of an analysis of the carbonyl changes in aging asphalts, asphalt aging index can be applied to predicting the degree of aging of warm-mix HVMA.
Subject
Warm-mix additive
High-viscosity modified asphalt
HVMA
Rheological characteristics
Aging index
Aging degree
To reference this document use:
http://resolver.tudelft.nl/uuid:0f663d45-20b0-46b5-bb73-f1c2b5cb4e7d
DOI
https://doi.org/10.1061/(ASCE)MT.1943-5533.0004501
Embargo date
2023-07-01
ISSN
0899-1561
Source
Journal of Materials in Civil Engineering, 34 (12), 1-13
Bibliographical note
Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Part of collection
Institutional Repository
Document type
journal article
Rights
© 2022 Bei Chen, Fuqiang Dong, Xin Yu, S. Ren, Changjiang Zheng