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Abstract:
The creep of asphalt and asphalt concrete were numerically studied extensively. However, most of the previous studies only researched the decelerated creep stage and equi-velocity creep stage while rarely shed light on the accelerated creep stage. This paper proposes a novel 3 dimensional visco-elastic damage model utilizing two spring and one dashpot components coupled with Kachanov and Robotnov (K-R) creep damage theory to describe the whole stages of the creep of asphalt and asphalt concrete, i.e., decelerated creep stage, equi-velocity creep stage, and accelerated creep stage. The damage evolution equation based on the K-R creep damage theory is integrated into the visco-elastic constitutive model by the continuum mechanics, and then the uniaxial creep damage solution is deducted. A robust numerical algorithm of this model is developed. Through numerical tests on uniaxial compression and pre-notched three-point bending beam, the numerical curves are analogue to measured creep curves, which justifies the accuracy and efficiency of the visco-elastic model coupling with K-R creep damage theory and the corresponding numerical algorithm. This paper provides not only an accurate and robust creep damage constitutive model for the asphalt and asphalt concrete, but also a valuable model and an efficient numerical method to evaluate the damage and rupture behavior of large-scale infrastructures fabricated by asphalt and asphalt concrete. (C) 2020 Elsevier Ltd. All rights reserved.
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Source :
CONSTRUCTION AND BUILDING MATERIALS
ISSN: 0950-0618
Year: 2020
Volume: 264
7 . 4 0 0
JCR@2022
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:169
Cited Count:
WoS CC Cited Count: 17
SCOPUS Cited Count: 18
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 7
Affiliated Colleges: