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    Impact of Rest Period and Stress Paths on Asphalt Concrete Permanent Deformation Behavior

    Source: Journal of Materials in Civil Engineering:;2023:;Volume ( 035 ):;issue: 010::page 04023330-1
    Author:
    Ashraf Alrajhi
    ,
    Hasan Ozer
    DOI: 10.1061/JMCEE7.MTENG-15980
    Publisher: ASCE
    Abstract: The traditional repeated-load permanent deformation tests for asphalt concrete (AC) considers only the triaxial compression stress state as the critical loading case. These types of experiments may not represent the most critical stress states or they may neglect the effect of the history of the loading path due to the passing of vehicles. The main goal of the study is to assess the impact of various stress paths to represent moving load stress on permanent deformations. The effect of stress paths on permanent deformation characteristics of a polymer modified and unmodified AC mixture was presented. The stress paths included conventional triaxial compression, reduced triaxial compression, and triaxial simple shear stress paths. The rest period was added to the stress paths as a variable. The mixes were tested using the stress states constituting the three different stress paths and temperature. In addition, the viscoelastic recovery and viscoplastic hardening–relaxation phenomenon to explain the effect of the changing rest period was explored by conducting tests at intermediate temperature and lower stress levels and focusing on the beginning stages of the experiment. It was shown that viscoelastic recovery and viscoplastic hardening–relaxation may have competing mechanisms on the total and permanent strains when the rest period changes. However, viscoplastic effects overwhelmed the viscoplastic deformation and recovery. The increase in the rest period from 0.18 to 2.5 s consistently increased the permanent deformations by almost 2–3 times higher under three stress paths. The significance of the rest period as a testing variable along with stress state and temperature in repeated-load permanent deformation experiments is once again underlined. The results show that the changing stress paths had a significant effect on permanent deformation resistance when compared to conventional repeated-load experiments. The reduced triaxial compression stress path was found to be a more critical stress state in terms of permanent strains.
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      Impact of Rest Period and Stress Paths on Asphalt Concrete Permanent Deformation Behavior

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    contributor authorAshraf Alrajhi
    contributor authorHasan Ozer
    date accessioned2023-11-27T23:53:07Z
    date available2023-11-27T23:53:07Z
    date issued7/18/2023 12:00:00 AM
    date issued2023-07-18
    identifier otherJMCEE7.MTENG-15980.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4293921
    description abstractThe traditional repeated-load permanent deformation tests for asphalt concrete (AC) considers only the triaxial compression stress state as the critical loading case. These types of experiments may not represent the most critical stress states or they may neglect the effect of the history of the loading path due to the passing of vehicles. The main goal of the study is to assess the impact of various stress paths to represent moving load stress on permanent deformations. The effect of stress paths on permanent deformation characteristics of a polymer modified and unmodified AC mixture was presented. The stress paths included conventional triaxial compression, reduced triaxial compression, and triaxial simple shear stress paths. The rest period was added to the stress paths as a variable. The mixes were tested using the stress states constituting the three different stress paths and temperature. In addition, the viscoelastic recovery and viscoplastic hardening–relaxation phenomenon to explain the effect of the changing rest period was explored by conducting tests at intermediate temperature and lower stress levels and focusing on the beginning stages of the experiment. It was shown that viscoelastic recovery and viscoplastic hardening–relaxation may have competing mechanisms on the total and permanent strains when the rest period changes. However, viscoplastic effects overwhelmed the viscoplastic deformation and recovery. The increase in the rest period from 0.18 to 2.5 s consistently increased the permanent deformations by almost 2–3 times higher under three stress paths. The significance of the rest period as a testing variable along with stress state and temperature in repeated-load permanent deformation experiments is once again underlined. The results show that the changing stress paths had a significant effect on permanent deformation resistance when compared to conventional repeated-load experiments. The reduced triaxial compression stress path was found to be a more critical stress state in terms of permanent strains.
    publisherASCE
    titleImpact of Rest Period and Stress Paths on Asphalt Concrete Permanent Deformation Behavior
    typeJournal Article
    journal volume35
    journal issue10
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/JMCEE7.MTENG-15980
    journal fristpage04023330-1
    journal lastpage04023330-11
    page11
    treeJournal of Materials in Civil Engineering:;2023:;Volume ( 035 ):;issue: 010
    contenttypeFulltext
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