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<p>This study evaluated the effects of moisture damage and temperature on the interface shear strength (ISS) of asphalt concrete layers. Five tack coats were studied: SS-1&#xa0;H, CSS-1&#xa0;H, silane-based nanopolymer-modified SS-1HP, silane-based nanopolymer-modified CSS-1HP, and trackless tack. Double-layer asphalt concrete specimens were prepared using a superpave gyratory compactor. The specimens were tested in direct shear at 20&#xa0;°C, 30&#xa0;°C, and 50&#xa0;°C. Moisture damage was simulated using the Moisture-Induced Stress Tester (MIST). MIST was selected because it more realistically simulates traffic-induced pore-pressure at the interface compared to conventional vacuum saturation methods. The results showed that the optimum residual application rate depended on tack coat type and test temperature. At 20&#xa0;°C and 30&#xa0;°C, the optimum rate was 0.04 gal/yd² for SS-1&#xa0;H and CSS-1&#xa0;H and 0.06 gal/yd² for SS-1HP and CSS-1HP. Trackless tack showed increasing ISS up to 0.10 gal/yd². At 50&#xa0;°C, ISS decreased with increasing application rate for all tack coats. MIST conditioning reduced ISS by 20–24% for conventional tack coats, 15–16% for polymer-modified tack coats, and 6% for trackless tack. Temperature caused larger reductions. At 30&#xa0;°C, ISS decreased by 25–42%. At 50&#xa0;°C, the reduction reached 65–80%. ANOVA showed that tack coat type, moisture damage, temperature, and their interactions had significant effects on ISS. Overall, trackless tack showed the best resistance to moisture and temperature damage. The findings show that tack coat selection is important for maintaining interface bonding under wet and high-temperature conditions.</p>

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Effects of moisture damage, and temperature on interface shear strength of an asphalt concrete

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月8日

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  • Muhammad Tasnim Alam,
  • Rafiqul A. Tarefder

摘要

This study evaluated the effects of moisture damage and temperature on the interface shear strength (ISS) of asphalt concrete layers. Five tack coats were studied: SS-1 H, CSS-1 H, silane-based nanopolymer-modified SS-1HP, silane-based nanopolymer-modified CSS-1HP, and trackless tack. Double-layer asphalt concrete specimens were prepared using a superpave gyratory compactor. The specimens were tested in direct shear at 20 °C, 30 °C, and 50 °C. Moisture damage was simulated using the Moisture-Induced Stress Tester (MIST). MIST was selected because it more realistically simulates traffic-induced pore-pressure at the interface compared to conventional vacuum saturation methods. The results showed that the optimum residual application rate depended on tack coat type and test temperature. At 20 °C and 30 °C, the optimum rate was 0.04 gal/yd² for SS-1 H and CSS-1 H and 0.06 gal/yd² for SS-1HP and CSS-1HP. Trackless tack showed increasing ISS up to 0.10 gal/yd². At 50 °C, ISS decreased with increasing application rate for all tack coats. MIST conditioning reduced ISS by 20–24% for conventional tack coats, 15–16% for polymer-modified tack coats, and 6% for trackless tack. Temperature caused larger reductions. At 30 °C, ISS decreased by 25–42%. At 50 °C, the reduction reached 65–80%. ANOVA showed that tack coat type, moisture damage, temperature, and their interactions had significant effects on ISS. Overall, trackless tack showed the best resistance to moisture and temperature damage. The findings show that tack coat selection is important for maintaining interface bonding under wet and high-temperature conditions.