通过冷回收和添加剂整合提高废旧沥青的耐久性

Ali Almusawi, Mustafa Mohammed Jaleel, Sarmad Shoman, Andrei P. Lupanov
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摘要

通过结合各种添加剂的冷再生技术,可以大大提高废弃沥青的使用寿命。本研究调查了使用再生沥青路面(RAP)、波特兰水泥、阳离子沥青乳液和其他集料对老化沥青混凝土进行冷再生的情况。主要目的是评估不同混合料成分在平均密度、抗压强度、耐水性和膨胀性方面的性能提升。对三种不同的混合料进行了配制和评估。1 号混合料仅由 RAP 组成,平均密度最低,膨胀率最高,表明由于缺乏结合剂,性能较差。2 号混合料包含 RAP、硅酸盐水泥和水,密度和抗压强度最高,突出了硅酸盐水泥在改善结构完整性方面的关键作用。3 号混合料是一种更复杂的混合物,包括 RAP、集料、硅酸盐水泥、水和沥青乳液,显示出均衡的特性,具有更强的防潮性和更低的膨胀性。实验结果表明,添加硅酸盐水泥和沥青乳液可有效改善再生沥青混合料的机械性能和耐久性能。具体而言,2 号和 3 号混合料的性能显著提高,适合道路养护应用。这项研究提倡广泛使用添加剂的冷再循环方法,以实现可持续和具有成本效益的路面修复解决方案。
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Enhancing waste asphalt durability through cold recycling and additive integration

The longevity of waste asphalt can be considerably improved through cold recycling techniques combined with various additives. This research investigates the cold regeneration of aged asphalt concrete using Reclaimed Asphalt Pavement (RAP), Portland cement, cationic bitumen emulsion, and additional aggregates. The primary goal is to evaluate the performance enhancements in terms of average density, compressive strength, water resistance, and swelling across different mix compositions. Three distinct mixtures were formulated and assessed. Mix No. 1, composed solely of RAP, showed the lowest average density and highest swelling, indicating poor performance due to the lack of binding agents. Mix No. 2, which incorporated RAP, Portland cement, and water, exhibited the highest density and compressive strength, highlighting the crucial role of Portland cement in improving structural integrity. Mix No. 3, a more complex mixture including RAP, aggregates, Portland cement, water, and bitumen emulsion, displayed balanced properties with enhanced moisture resistance and reduced swelling. The experimental findings emphasize the effectiveness of adding Portland cement and bitumen emulsion to improve the mechanical and durability characteristics of recycled asphalt mixtures. Specifically, Mix No. 2 and Mix No. 3 demonstrated significant performance improvements, making them suitable for road maintenance applications. This study advocates for the widespread use of cold recycling methods with additive integration to achieve sustainable and cost-effective pavement restoration solutions.

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