Moisture Susceptibility Evaluation of Nanosize Hydrated Lime-Modified Asphalt-Aggregate Systems Based on Surface Free Energy Concept
Moisture Susceptibility Evaluation of Nanosize Hydrated Lime-Modified Asphalt-Aggregate Systems Based on Surface Free Energy Concept
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DOI：
10.3141/2446-06
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发表时间：
2014-01-01
影响因子：
1.7
通讯作者：
Zaman, Musharraf
中科院分区：
文献类型：
--
作者：
Diab, Aboelkasim;You, Zhanping;Zaman, Musharraf
湿气敏感性会导致沥青集料系统内聚和粘合失效，从而导致严重的路面问题。常规熟石灰（RHL）作为沥青路面抗剥落剂的作用已通过传统的湿敏性评估方法得到广泛解决。然而，纳米熟石灰（NHL）在沥青工业中的使用尚未开始。本研究的第一个目标是根据表面自由能 (SFE) 概念，使用 Wilhelmy 板法评估 RHL 和 NHL 改性沥青结合料。 Advera 是一种温拌沥青 (WMA) 发泡添加剂，被添加到熟石灰（RHL 和 NHL）改性沥青粘合剂中，以解决发泡对内聚粘合强度的影响。添加的NHL材料的颗粒尺寸为50和100纳米。第二个目标是解决上述沥青粘合剂和不同集料之间的粘合强度。使用具有已知 SFE 组分的不同酸性和碱性集料以及测量的沥青粘合剂的 SFE 组分来定量确定系统中的粘附自由能。总体结果表明，沥青结合料的 SFE 成分取决于熟石灰的粒径。一般来说，NHL改性沥青结合料的内聚力高于RHL改性沥青结合料。随着熟石灰颗粒尺寸的减小，干和湿粘合力增加。 Advera 泡沫混合物的湿度敏感性似乎取决于骨料类型。 NHL 改性混合物预计在干燥和潮湿条件下比 MIL 改性混合物表现更好。
Moisture susceptibility can cause cohesive and adhesive failures in the asphalt aggregate system, resulting in serious pavement distresses. The role of regular hydrated lime (RHL) as an antistripping agent in asphalt pavements has been widely addressed with traditional moisture susceptibility evaluation methods. However, the use of nanosize hydrated lime (NHL) in asphalt industries has not yet been initiated. The first objective of this study was to assess the RHL- and NHL-modified asphalt binders on the basis of the surface free energy (SFE) concept by using the Wilhelmy plate method. Advera, a warm-mix asphalt (WMA) foaming additive, was added to the hydrated lime-(RHL and NHL) modified asphalt binders to address the effect of foaming on cohesive bond strength. The NHL material was added with particle sizes of 50 and 100 nanometers. The second objective was to address the adhesive bond strength between the aforementioned asphalt binders and different aggregates. Different acidic and basic aggregates with known SFE components were used along with measured SFE components of the asphalt binders to determine quantitatively the free energy of adhesion in the system. Overall results reveal that SFE components of asphalt binders are dependent on the particle size of hydrated lime. In general, the cohesive bond of the NHL-modified asphalt binder was higher than that of the RHL-modified binder. As hydrated lime particle size decreases, dry and wet adhesive bonds increase. Moisture susceptibility of Advera-foamed mixes seems to depend on aggregate type. The NHL-modified mixes are expected to perform better than MIL-modified mixes in dry and wet conditions.