Rutting and surface-initiated cracking mechanisms of semi-flexible pavements with cement asphalt emulsion pastes

The semi-flexible pavement (SFP) has been used as a promising wearing course in heavy traffic roads. It is crucial to investigate the main failure mechanisms caused by different influencing factors on SFPs at medium and high temperatures. In this research, utilising a three-dimensional (3D) finite-e...

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Bibliographic Details
Published in:The international journal of pavement engineering 2023-01, Vol.24 (2)
Main Authors: Zarei, Sohrab, Alae, Mohsen, Ouyang, Jian, Zhao, Yanqing
Format: Article
Language:English
Subjects:
Asphalt
Asphalt pavements
Bituminous cements
Cement
cement asphalt emulsion paste
Cement paste
Contact stresses
Emulsions
Failure mechanisms
Fatigue cracking
Fatigue failure
Fatigue life
Finite element method
Flexible pavements
Fracture mechanics
High temperature
Mathematical analysis
Mixtures
Numerical analysis
rutting resistance
Semi-flexible pavement
Subgrades
Three dimensional models
top-down cracking
viscoelastic analysis
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Summary:The semi-flexible pavement (SFP) has been used as a promising wearing course in heavy traffic roads. It is crucial to investigate the main failure mechanisms caused by different influencing factors on SFPs at medium and high temperatures. In this research, utilising a three-dimensional (3D) finite-element model (FEM), the performance of SFP and conventional pavement under realistic tire-pavement contact stresses was compared by computing the critical responses associated with rutting and top-down cracking (TDC). Besides, experimental studies were conducted on typical asphalt concrete (AC16) and four types of SFP mixtures grouted with cement paste and cement asphalt emulsion pastes (CAEPs) to evaluate their rutting resistance and fatigue cracking potential at medium and high temperatures. The numerical analysis results indicated that SFP mixtures with lower asphalt emulsion (AE) content enhanced rutting resistance significantly while TDC potential was reduced at higher percentages of AE. Compared to dual-tire assembly, the wide-base tire led to less TDC damage and asphalt layer (primary) rutting, but more subgrade (secondary) rutting once carrying the same load. Moreover, based on the findings of laboratory evaluation, SFP with CAEP presented the best performance in terms of fatigue life and permanent deformation when AE to cement by weight (AE/C) was no more than 0.4.
ISSN:1029-8436
1477-268X
DOI:10.1080/10298436.2021.2024187