Albayati Amjad H, Oukaili Nazar K, Moudhafar Mustafa M, Allawi Abbas A, Said Abdulmuttalib I, Ibrahim Teghreed H
Department of Civil Engineering, University of Baghdad, Baghdad 17001, Iraq.
Materials (Basel). 2024 Aug 29;17(17):4279. doi: 10.3390/ma17174279.
The dual nature of asphalt binder necessitates improvements to mitigate rutting and fatigue since it performs as an elastic material under the regime of rapid loading or cold temperatures and as a viscous fluid at elevated temperatures. The present investigation assesses the effectiveness of Nano Alumina (NA), Nano Silica (NS), and Nano Titanium Dioxide (NT) at weight percentages of 0, 2, 4, 6, and 8% in asphalt cement to enhance both asphalt binder and mixture performance. Binder evaluations include tests for consistency, thermal susceptibility, aging, and workability, while mixture assessments focus on Marshall properties, moisture susceptibility, resilient modulus, permanent deformation, and fatigue characteristics. NS notably improves binder viscosity by about 138% and reduces penetration by approximately 40.8% at 8% nanomaterial (NM) content, significantly boosting hardness and consistency. NS also enhances Marshall stability and decreases air voids, increasing the mix's durability. For moisture resistance, NS at 8% NM content elevates the Tensile Strength Ratio (TSR) to 91.0%, substantially surpassing the 80% standard. Similarly, NA and NT also show improved TSR values at 8% NM content, with 88.0% and 84.1%, respectively. Additionally, NS, NA, and NT reduce permanent deformation by 82%, 69%, and 64% at 10,000 cycles at 8% NM content, illustrating their effectiveness in mitigating pavement distress. Notably, while higher NM content generally results in better performance across most tests, the optimal NM content for fatigue resistance is 4% for NS and 6% for both NA and NT, reflecting their peak performance against various types of pavement distresses. These results highlight the significant advantages of nanoparticles in improving asphalt's mechanical properties, workability, stability, and durability. The study recommends further field validation to confirm these laboratory findings and ensure that enhancements translate into tangible improvements in real-world pavement performance and longevity.
沥青结合料的双重特性要求进行改进以减轻车辙和疲劳，因为它在快速加载或低温条件下表现为弹性材料，而在高温下表现为粘性流体。本研究评估了纳米氧化铝（NA）、纳米二氧化硅（NS）和纳米二氧化钛（NT）在沥青胶结料中0%、2%、4%、6%和8%的重量百分比下对提高沥青结合料和混合料性能的有效性。结合料评估包括稠度、热敏感性、老化和工作性测试，而混合料评估则侧重于马歇尔性能、水敏感性、回弹模量、永久变形和疲劳特性。在纳米材料（NM）含量为8%时，NS显著提高了结合料粘度约138%，并使针入度降低了约40.8%，显著提高了硬度和稠度。NS还提高了马歇尔稳定性并减少了空隙率，提高了混合料的耐久性。对于抗湿性，NM含量为8%的NS将拉伸强度比（TSR）提高到91.0%，大大超过了80%的标准。同样，NA和NT在NM含量为8%时也显示出改善的TSR值，分别为88.0%和84.1%。此外，在NM含量为8%时，NS、NA和NT在10000次循环时将永久变形降低了82%、69%和64%，说明了它们在减轻路面病害方面的有效性。值得注意的是，虽然较高的NM含量通常在大多数测试中会带来更好的性能，但NS抗疲劳的最佳NM含量为4%，NA和NT均为6%，这反映了它们在抵抗各种类型路面病害方面的最佳性能。这些结果突出了纳米颗粒在改善沥青的力学性能、工作性、稳定性和耐久性方面的显著优势。该研究建议进一步进行现场验证，以确认这些实验室结果，并确保这些改进能够切实提高实际路面的性能和使用寿命。
