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<p>Intermediate-temperature cracking is a major phenomenon in asphalt pavements that adversely affects long-term performance and durability. Therefore, several modification techniques have been employed to improve the toughness and mechanical performance, e.g., with polymers and nano fillers. This study investigated the influence of a graphene oxide-styrene butadiene nanocomposite (GOSBN) on the Intermediate-temperature cracking behavior of asphalt mixtures. It also assessed the efficacy of GOSBN on improving fracture energy, fracture toughness, and adhesion-cohesion properties at various temperatures. To study the mixture’s temperature-related responses, semi-circular bending (SCB) and pull-off tests were conducted at three temperatures (5, 15, and 25&#xa0;°C). To performance-grade bitumens (PG 64 − 16 and PG 58 − 22) were selected to study the compatibility with different mixture formulations, while two aggregate sources (granite and limestone) were used to investigate the effects of mineralogy. GOSBN was added to bitumen at concentrations of 0%, 0.4%, and 0.8% by bitumen weight to evaluate its effect on the properties of asphalt mixtures. PG 64 − 16 exhibited superior intermediate-temperature performance compared to PG 58 − 22, particularly in fracture energy, fracture toughness, and adhesion, suggesting that a stiffer binder enhances resistance to intermediate-temperature cracking. Additionally, increasing GOSBN dosage significantly improved fracture energy, fracture toughness, and crack propagation resistance across all temperatures, reinforcing the effectiveness of nanocomposite modification. Limestone-based mixtures demonstrated better adhesion performance than granite-based ones, confirming the chemical compatibility between limestone’s alkaline nature and bitumen’s acidic properties. GOSBN increased the bitumen’s cohesion pull-off strength and the bitumen-aggregate adhesion pull-off strength. These findings emphasize the importance of bitumen selection, aggregate mineralogy, and modifying incorporation in optimizing asphalt mixture performance and prolonging pavement lifespan.</p>

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Effects of a graphene oxide and styrene-butadiene nanocomposite on the intermediate-temperature cracking resistance of asphalt concretes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • Mohammad Hosein Dehnad,
  • Gholam Hossein Hamedi,
  • Noor Wannas Ghafil Al-Khrayfawee

摘要

Intermediate-temperature cracking is a major phenomenon in asphalt pavements that adversely affects long-term performance and durability. Therefore, several modification techniques have been employed to improve the toughness and mechanical performance, e.g., with polymers and nano fillers. This study investigated the influence of a graphene oxide-styrene butadiene nanocomposite (GOSBN) on the Intermediate-temperature cracking behavior of asphalt mixtures. It also assessed the efficacy of GOSBN on improving fracture energy, fracture toughness, and adhesion-cohesion properties at various temperatures. To study the mixture’s temperature-related responses, semi-circular bending (SCB) and pull-off tests were conducted at three temperatures (5, 15, and 25 °C). To performance-grade bitumens (PG 64 − 16 and PG 58 − 22) were selected to study the compatibility with different mixture formulations, while two aggregate sources (granite and limestone) were used to investigate the effects of mineralogy. GOSBN was added to bitumen at concentrations of 0%, 0.4%, and 0.8% by bitumen weight to evaluate its effect on the properties of asphalt mixtures. PG 64 − 16 exhibited superior intermediate-temperature performance compared to PG 58 − 22, particularly in fracture energy, fracture toughness, and adhesion, suggesting that a stiffer binder enhances resistance to intermediate-temperature cracking. Additionally, increasing GOSBN dosage significantly improved fracture energy, fracture toughness, and crack propagation resistance across all temperatures, reinforcing the effectiveness of nanocomposite modification. Limestone-based mixtures demonstrated better adhesion performance than granite-based ones, confirming the chemical compatibility between limestone’s alkaline nature and bitumen’s acidic properties. GOSBN increased the bitumen’s cohesion pull-off strength and the bitumen-aggregate adhesion pull-off strength. These findings emphasize the importance of bitumen selection, aggregate mineralogy, and modifying incorporation in optimizing asphalt mixture performance and prolonging pavement lifespan.