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Author:

Wang, Chao (Wang, Chao.) (Scholars:王超) | Chen, Yifang (Chen, Yifang.) | Gong, Guanyu (Gong, Guanyu.)

Indexed by:

EI Scopus SCIE

Abstract:

Generally, the cohesive healing within the asphalt composites and the adhesive healing from the asphalt-aggregate interface always occur simultaneously in the asphalt concrete with growing damage. This study aims to investigate the cohesive and adhesive healing behaviors of asphalt binder respectively by utilizing the newly developed linear amplitude sweep based healing (LASH) and binder bond strength based healing (BBSH) tests. Seven unmodified asphalt binders and one styrene–butadienestyrene (SBS) polymer modified binder are selected in this study. A fracture mechanics based crack growth approach is proposed to define the cohesive healing recovery in the LASH test with two percent healing parameters, in terms of the %Ha of the crack length recovery and the %HA of the sample intact area recovery. In pre-failure conditions, the measured %Ha can at least reach beyond 30% while the %HA is normally within 30% for tested binders. Meanwhile, the %Ha results show more consistent trends to the traditional simplified-viscoelastic continuum damage (S-VECD) based LASH data interpretation. Furthermore, the cohesive failure occurrence is verified to significantly impact the healing performance comparison. The cohesive healing behaviors of neat and SBS binders respectively in pre-failure and post-failure conditions are distinguished to each other, which are validated either from S-VECD or crack growth approaches. Regarding to the binder adhesive healing behavior, it is observed that the presence of water and the using of granite substrate generally have positive effects on adhesive healing recovery in the BBSH tests. The SBS modification generally displays lower adhesive healing percentages than the neat binders especially in the wet conditions. Though no clear relationships can be found between the cohesive and adhesive healing behaviors in this study, it is recommended to quantify the binder contribution to the adhesive healing process in the future work. © 2021 Elsevier Ltd

Keyword:

Concrete aggregates Styrene Binders Recovery Fracture mechanics Adhesives Cracks Asphalt Self healing concrete

Author Community:

  • [ 1 ] [Wang, Chao]Department of Road & Urban Railway Engineering, Beijing University of Technology, Beijing; 100124, China
  • [ 2 ] [Chen, Yifang]Department of Road & Urban Railway Engineering, Beijing University of Technology, Beijing; 100124, China
  • [ 3 ] [Gong, Guanyu]Department of Road & Urban Railway Engineering, Beijing University of Technology, Beijing; 100124, China

Reprint Author's Address:

  • 王超

    [wang, chao]department of road & urban railway engineering, beijing university of technology, beijing; 100124, china

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Source :

Construction and Building Materials

ISSN: 0950-0618

Year: 2021

Volume: 282

7 . 4 0 0

JCR@2022

ESI Discipline: MATERIALS SCIENCE;

ESI HC Threshold:116

JCR Journal Grade:1

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 9

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 6

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