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Dielectric-Based Estimation of HMA Dynamic Modulus

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Titel: Dielectric-Based Estimation of HMA Dynamic Modulus
Autoren: Konstantina Georgouli, Andreas Loizos
Quelle: Construction Materials, Vol 5, Iss 3, p 43 (2025)
Verlagsinformationen: MDPI AG, 2025.
Publikationsjahr: 2025
Bestand: LCC:Building construction
Schlagwörter: dynamic modulus, predictive algorithm, air voids, dielectric value, dense-graded mixes, open-graded mixes, Building construction, TH1-9745
Beschreibung: This research aims to investigate the possibility of measuring dielectric constant as an alternative proxy for estimating E* through a non-destructive procedure. An experimental program was conducted on dense-graded (DG) and open-graded (OG) asphalt mixtures, where variable asphalt contents and compaction levels were controlled to achieve different air voids. The measurements of dielectric constant were performed with a Percometer, and E* values were obtained using standard laboratory tests. For DG mixtures, a clear correlation was observed between dielectric constant, air void content and effective binder ratio. The less consistent relationships for OG mixtures were likely due to the more heterogeneous structure of the OG mixtures, the conductive slag aggregates and a limited dataset. Using dielectric values, two predictive models were developed (DIME_DG and DIME_OG), with the former showing higher reliability. Verification with independent specimens confirmed model robustness. This dielectric-based approach offers a practical, cost-effective alternative to traditional modulus testing. The key innovation of this study is the integration of the asphalt mix dielectric constant into established dynamic modulus predictive models, offering a novel approach that enhances the sensitivity of these models to mixture-specific characteristics beyond traditional volumetric and binder properties.
Publikationsart: article
Dateibeschreibung: electronic resource
Sprache: English
ISSN: 2673-7108
Relation: https://www.mdpi.com/2673-7108/5/3/43; https://doaj.org/toc/2673-7108
DOI: 10.3390/constrmater5030043
Zugangs-URL: https://doaj.org/article/74c5c56a59fc42c990468bd751cf67e7
Dokumentencode: edsdoj.74c5c56a59fc42c990468bd751cf67e7
Datenbank: Directory of Open Access Journals
Beschreibung
Abstract:This research aims to investigate the possibility of measuring dielectric constant as an alternative proxy for estimating E* through a non-destructive procedure. An experimental program was conducted on dense-graded (DG) and open-graded (OG) asphalt mixtures, where variable asphalt contents and compaction levels were controlled to achieve different air voids. The measurements of dielectric constant were performed with a Percometer, and E* values were obtained using standard laboratory tests. For DG mixtures, a clear correlation was observed between dielectric constant, air void content and effective binder ratio. The less consistent relationships for OG mixtures were likely due to the more heterogeneous structure of the OG mixtures, the conductive slag aggregates and a limited dataset. Using dielectric values, two predictive models were developed (DIME_DG and DIME_OG), with the former showing higher reliability. Verification with independent specimens confirmed model robustness. This dielectric-based approach offers a practical, cost-effective alternative to traditional modulus testing. The key innovation of this study is the integration of the asphalt mix dielectric constant into established dynamic modulus predictive models, offering a novel approach that enhances the sensitivity of these models to mixture-specific characteristics beyond traditional volumetric and binder properties.
ISSN:26737108
DOI:10.3390/constrmater5030043