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首页> 外文期刊>Journal of materials in civil engineering >Evaluation of Warm Mix Asphalt Mixtures Containing Reclaimed Asphalt Pavement through Mechanical Performance Tests and an Acoustic Emission Approach
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Evaluation of Warm Mix Asphalt Mixtures Containing Reclaimed Asphalt Pavement through Mechanical Performance Tests and an Acoustic Emission Approach

机译：通过机械性能测试和声发射方法评估含再生沥青路面的热拌沥青混合料

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Reclaimed asphalt pavement (RAP) and warm mix asphalt (WMA) have become the primary methods for enhancing sustain-ability in the asphalt industry in recent years. To further enhance sustainability benefits, asphalt producers have begun using RAP and WMA in combination. Research to date has focused on evaluating WMA-RAP mixtures in terms of moisture sensitivity and permanent deformation characteristics as measured in laboratory performance tests. In the present paper, the authors investigate a set of WMA mixtures that encompass a variety of variables, including four WMA additives (Evotherm 3G, Rediset LQ, Sasobit, and Advera) and three RAP contents (0, 15, and 45%). A common belief among practitioners is that the reduced aging in the asphalt binder associated with lower production temperatures in WMA mixtures leaves additional headroom for the incorporation of higher amounts of RAP, which is generally a stiffer, more brittle material. To fully characterize the performance of WMA-RAP mixtures, the authors evaluated the low-temperature, cracking behavior of these mixtures in conjunction with moisture and rutting resistance characterization. They achieved the low temperature testing of WMA-RAP mixtures through the disk-shaped compact tension [DC(T)], indirect tension (IDT) creep compliance, and acoustic emission (AE) tests. Test results showed that chemical additives improved moisture susceptibility according to the AASHTO T 283 standard test and fracture and bulk stress relaxation characteristics using the DC(T) and IDT tests, respectively. The organic Fischer-Tropsch wax-modified WMA mixtures performed the best among the WMA mixtures in terms of rutting resistance. The introduction of RAP led to the increased resistance to permanent deformation and moisture damage. Conversely, RAP reduced thermal cracking resistance according to the low-temperature performance tests in both HMA and WMA. The authors observed the same trend in AE test results as WMA-RAP mixtures exhibited warmer embrittlement temperatures as compared with control mixtures and are therefore expected to be more prone to thermal cracking. On the basis of these findings, thermal cracking resistance remains an issue to be considered in WMA mixtures containing RAP. Additionally, performance testing has shown to be a valuable tool for the evaluation of RAP and WMA mix designs to avoid performance issues in the field.
机译：近年来，再生沥青路面（RAP）和热拌沥青（WMA）已成为增强沥青行业可持续性的主要方法。为了进一步提高可持续性收益，沥青生产商已开始结合使用RAP和WMA。迄今为止，研究集中在评估湿气敏感性和永久变形特性方面，对WMA-RAP混合物进行了评估，这些特性是在实验室性能测试中测得的。在本文中，作者研究了一组WMA混合物，其中包含各种变量，包括四种WMA添加剂（Evotherm 3G，Rediset LQ，Sasobit和Advera）和三种RAP含量（0％，15％和45％）。从业人员普遍认为，沥青粘合剂的老化减少与WMA混合物中较低的生产温度有关，为掺入更多的RAP（通常是更硬，更脆的材料）留出了额外的净空。为了充分表征WMA-RAP混合物的性能，作者评估了这些混合物的低温，抗裂性能以及耐湿性和耐车辙性。他们通过盘形紧凑张力[DC（T）]，间接张力（IDT）蠕变柔度和声发射（AE）测试实现了WMA-RAP混合物的低温测试。测试结果表明，根据AASHTO T 283标准测试，化学添加剂改善了水分敏感性，分别使用DC（T）和IDT测试改善了断裂应力和整体应力松弛特性。就耐车辙性而言，有机费-托蜡改性的WMA混合物在WMA混合物中表现最好。 RAP的引入导致对永久变形和湿气破坏的抵抗力增强。相反，根据HMA和WMA中的低温性能测试，RAP降低了抗热裂性。作者在AE测试结果中观察到了相同的趋势，因为WMA-RAP混合物与对照混合物相比显示出较脆的温度，因此预计更容易发生热裂。基于这些发现，在包含RAP的WMA混合物中，耐热裂性仍然是要考虑的问题。此外，性能测试已证明是评估RAP和WMA混合设计以避免现场性能问题的宝贵工具。

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