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<p>This study investigated the combined effects of temperature, loading rate, and void content on the fracture behavior of asphalt concrete (AC). The Indirect Tensile Asphalt Cracking Test (IDEAL-CT) was performed on AC specimens at three temperatures (10&#xa0;°C, 20&#xa0;°C and 30&#xa0;°C) and three loading rates (0.5, 5 and 50&#xa0;mm/min). The AC specimens were categorized into two groups based on air void content: 4.6% and 7.0%. To characterize the binder properties, complex shear modulus (<i>G*</i>) tests were conducted on the bitumen across a temperature range of -10&#xa0;°C to 70&#xa0;°C and angular frequencies ranging from 0.1&#xa0;rad/s to 100&#xa0;rad/s. The results showed a clear effect of temperature, loading rate, and void content on the fracture parameters of AC. The Cracking Tolerance Index increased by 608% as temperature increased, the post-peak slope increased by 805% as the loading rate decreased, and fracture energy increased by 67.6% as the void content decreased. The experimental results enabled the successful construction of master curves for fracture parameters. The shift factor was confirmed to be identical for these master curves and the <i>G*</i> master curve of bitumen. The experimental results indicated that the time-temperature superposition principle (TTSP) was linked from the linear viscoelastic domain for bitumen to the cracking domain for AC. Furthermore, the shift factors of master curves were shown to be identical for two ACs with different void contents. The TTSP has been demonstrated to be applicable to the entire IDEAL-CT process of AC, from the pre-peak behavior through crack initiation to crack propagation.</p>

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Fracture Behavior of Asphalt Concrete Under Varying Temperatures, Loading Rates and Void Contents Using the Indirect Tensile Asphalt Cracking Test

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Cong Thuc Nguyen,
  • Quang Tuan Nguyen,
  • Van Phuc Le,
  • Thi Cam Ha Tran,
  • Danh Hoi Tran,
  • Shisong Ren

摘要

This study investigated the combined effects of temperature, loading rate, and void content on the fracture behavior of asphalt concrete (AC). The Indirect Tensile Asphalt Cracking Test (IDEAL-CT) was performed on AC specimens at three temperatures (10 °C, 20 °C and 30 °C) and three loading rates (0.5, 5 and 50 mm/min). The AC specimens were categorized into two groups based on air void content: 4.6% and 7.0%. To characterize the binder properties, complex shear modulus (G*) tests were conducted on the bitumen across a temperature range of -10 °C to 70 °C and angular frequencies ranging from 0.1 rad/s to 100 rad/s. The results showed a clear effect of temperature, loading rate, and void content on the fracture parameters of AC. The Cracking Tolerance Index increased by 608% as temperature increased, the post-peak slope increased by 805% as the loading rate decreased, and fracture energy increased by 67.6% as the void content decreased. The experimental results enabled the successful construction of master curves for fracture parameters. The shift factor was confirmed to be identical for these master curves and the G* master curve of bitumen. The experimental results indicated that the time-temperature superposition principle (TTSP) was linked from the linear viscoelastic domain for bitumen to the cracking domain for AC. Furthermore, the shift factors of master curves were shown to be identical for two ACs with different void contents. The TTSP has been demonstrated to be applicable to the entire IDEAL-CT process of AC, from the pre-peak behavior through crack initiation to crack propagation.