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<p>This study developed a temperature-corrected framework for predicting critical pavement responses, namely the horizontal tensile strain at the bottom of the asphalt layer and the vertical compressive strain at the top of the subgrade, directly from falling weight deflectometer (FWD) deflection basin parameters based on layered elastic analysis principles. The framework was calibrated for three representative pavement structures in tropical environments: combined surface, thin surface, and cement-modified base systems. Temperature correction equations were developed to normalize deflection data to a reference temperature of 35°C using an effective asphalt concrete temperature concept consistent with FWD-based evaluation practice. Model performance was evaluated using field FWD data from multiple highway sections in Thailand, with reference strain values analytically derived through back-calculation and forward analysis. The predicted strains showed strong agreement with analytical results, with coefficients of determination reaching up to 0.965. The framework was further extended to overlay thickness design. The proposed method provided a transparent and computationally efficient alternative to conventional back-calculation, with strong potential for network-level pavement evaluation and rehabilitation planning in tropical regions.</p>

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A Practical Method for Predicting Pavement Strains and Overlay Thickness Using Temperature-Corrected FWD Deflection Basin Parameters

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Chana Phutthananon,
  • Warat Kongkitkul,
  • Chattawat Wantanagun,
  • Jutha Sunitsakul,
  • Sompote Youwai,
  • Pornkasem Jongpradist

摘要

This study developed a temperature-corrected framework for predicting critical pavement responses, namely the horizontal tensile strain at the bottom of the asphalt layer and the vertical compressive strain at the top of the subgrade, directly from falling weight deflectometer (FWD) deflection basin parameters based on layered elastic analysis principles. The framework was calibrated for three representative pavement structures in tropical environments: combined surface, thin surface, and cement-modified base systems. Temperature correction equations were developed to normalize deflection data to a reference temperature of 35°C using an effective asphalt concrete temperature concept consistent with FWD-based evaluation practice. Model performance was evaluated using field FWD data from multiple highway sections in Thailand, with reference strain values analytically derived through back-calculation and forward analysis. The predicted strains showed strong agreement with analytical results, with coefficients of determination reaching up to 0.965. The framework was further extended to overlay thickness design. The proposed method provided a transparent and computationally efficient alternative to conventional back-calculation, with strong potential for network-level pavement evaluation and rehabilitation planning in tropical regions.