Characterization of microdamage healing in asphalt concrete with a smeared continuum damage approach

B. Shane Underwood, Waleed Abdelaziz Zeiada

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    The fatigue of asphalt concrete (AC) mixtures is a major source of distress in pavement structures. In most laboratory fatigue studies, testing is carried out by means of continuously repeating load cycles. However, under real traffic conditions, AC is subjected to a succession of load pulses as the traffic passes. Between these loads the material is not subjected to external forces and undergoes changes related to relaxation and healing, which together act to increase the overall fatigue life relative to what is observed under continuous loading. In the study reported in this paper, the effects of a rest period on the fatigue response in uniaxial, on-specimen, displacement-controlled loading was studied at 4.4°C, 21.1°C, and 38°C. Loading consisted of a sinusoidal pulse-rest history with rest periods of 1, 5, or 10 s. Mixtures were used with the same aggregate structure and constituent materials hut different asphalt and air void (AV) contents. It was found that the introduction of even short rest periods substantially improved the fatigue response of AC. A viscoelastic damage model for smeared healing was derived and characterized with the measured data. This model was compared with a damage-only continuum formulation and used to identify the impacts of healing, apart from any viscoelastic relaxation effects. It was found that greater AC and lower AV content yielded more favorable healing behaviors. The findings also suggested differences in the active healing mechanisms in pulse-rest and block-rest loading, typically used to study healing in AC. These differences are discussed.

    Original languageEnglish (US)
    Pages (from-to)126-135
    Number of pages10
    JournalTransportation Research Record
    Volume2447
    DOIs
    StatePublished - 2014

    Fingerprint

    Asphalt concrete
    Fatigue of materials
    Concrete mixtures
    Air
    Asphalt
    Pavements
    Testing

    ASJC Scopus subject areas

    • Civil and Structural Engineering
    • Mechanical Engineering

    Cite this

    Characterization of microdamage healing in asphalt concrete with a smeared continuum damage approach. / Underwood, B. Shane; Zeiada, Waleed Abdelaziz.

    In: Transportation Research Record, Vol. 2447, 2014, p. 126-135.

    Research output: Contribution to journalArticle

    Underwood, B. Shane ; Zeiada, Waleed Abdelaziz. / Characterization of microdamage healing in asphalt concrete with a smeared continuum damage approach. In: Transportation Research Record. 2014 ; Vol. 2447. pp. 126-135.
    @article{c3be63cfea144a84b7b47637923cfd7f,
    title = "Characterization of microdamage healing in asphalt concrete with a smeared continuum damage approach",
    abstract = "The fatigue of asphalt concrete (AC) mixtures is a major source of distress in pavement structures. In most laboratory fatigue studies, testing is carried out by means of continuously repeating load cycles. However, under real traffic conditions, AC is subjected to a succession of load pulses as the traffic passes. Between these loads the material is not subjected to external forces and undergoes changes related to relaxation and healing, which together act to increase the overall fatigue life relative to what is observed under continuous loading. In the study reported in this paper, the effects of a rest period on the fatigue response in uniaxial, on-specimen, displacement-controlled loading was studied at 4.4°C, 21.1°C, and 38°C. Loading consisted of a sinusoidal pulse-rest history with rest periods of 1, 5, or 10 s. Mixtures were used with the same aggregate structure and constituent materials hut different asphalt and air void (AV) contents. It was found that the introduction of even short rest periods substantially improved the fatigue response of AC. A viscoelastic damage model for smeared healing was derived and characterized with the measured data. This model was compared with a damage-only continuum formulation and used to identify the impacts of healing, apart from any viscoelastic relaxation effects. It was found that greater AC and lower AV content yielded more favorable healing behaviors. The findings also suggested differences in the active healing mechanisms in pulse-rest and block-rest loading, typically used to study healing in AC. These differences are discussed.",
    author = "Underwood, {B. Shane} and Zeiada, {Waleed Abdelaziz}",
    year = "2014",
    doi = "10.3141/2447-14",
    language = "English (US)",
    volume = "2447",
    pages = "126--135",
    journal = "Transportation Research Record",
    issn = "0361-1981",
    publisher = "US National Research Council",

    }

    TY - JOUR

    T1 - Characterization of microdamage healing in asphalt concrete with a smeared continuum damage approach

    AU - Underwood, B. Shane

    AU - Zeiada, Waleed Abdelaziz

    PY - 2014

    Y1 - 2014

    N2 - The fatigue of asphalt concrete (AC) mixtures is a major source of distress in pavement structures. In most laboratory fatigue studies, testing is carried out by means of continuously repeating load cycles. However, under real traffic conditions, AC is subjected to a succession of load pulses as the traffic passes. Between these loads the material is not subjected to external forces and undergoes changes related to relaxation and healing, which together act to increase the overall fatigue life relative to what is observed under continuous loading. In the study reported in this paper, the effects of a rest period on the fatigue response in uniaxial, on-specimen, displacement-controlled loading was studied at 4.4°C, 21.1°C, and 38°C. Loading consisted of a sinusoidal pulse-rest history with rest periods of 1, 5, or 10 s. Mixtures were used with the same aggregate structure and constituent materials hut different asphalt and air void (AV) contents. It was found that the introduction of even short rest periods substantially improved the fatigue response of AC. A viscoelastic damage model for smeared healing was derived and characterized with the measured data. This model was compared with a damage-only continuum formulation and used to identify the impacts of healing, apart from any viscoelastic relaxation effects. It was found that greater AC and lower AV content yielded more favorable healing behaviors. The findings also suggested differences in the active healing mechanisms in pulse-rest and block-rest loading, typically used to study healing in AC. These differences are discussed.

    AB - The fatigue of asphalt concrete (AC) mixtures is a major source of distress in pavement structures. In most laboratory fatigue studies, testing is carried out by means of continuously repeating load cycles. However, under real traffic conditions, AC is subjected to a succession of load pulses as the traffic passes. Between these loads the material is not subjected to external forces and undergoes changes related to relaxation and healing, which together act to increase the overall fatigue life relative to what is observed under continuous loading. In the study reported in this paper, the effects of a rest period on the fatigue response in uniaxial, on-specimen, displacement-controlled loading was studied at 4.4°C, 21.1°C, and 38°C. Loading consisted of a sinusoidal pulse-rest history with rest periods of 1, 5, or 10 s. Mixtures were used with the same aggregate structure and constituent materials hut different asphalt and air void (AV) contents. It was found that the introduction of even short rest periods substantially improved the fatigue response of AC. A viscoelastic damage model for smeared healing was derived and characterized with the measured data. This model was compared with a damage-only continuum formulation and used to identify the impacts of healing, apart from any viscoelastic relaxation effects. It was found that greater AC and lower AV content yielded more favorable healing behaviors. The findings also suggested differences in the active healing mechanisms in pulse-rest and block-rest loading, typically used to study healing in AC. These differences are discussed.

    UR - http://www.scopus.com/inward/record.url?scp=84938559646&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84938559646&partnerID=8YFLogxK

    U2 - 10.3141/2447-14

    DO - 10.3141/2447-14

    M3 - Article

    VL - 2447

    SP - 126

    EP - 135

    JO - Transportation Research Record

    JF - Transportation Research Record

    SN - 0361-1981

    ER -