ABSTRACT

This paper focused on predicting the performance of asphalt mixes modified with nano-montmorillonite (NMMT) and nano silicon dioxide (NSD) using the Quality-Related Specifications Software (QRSS), which is a simplification to the Pavement ME Design. The nanomaterials were thoroughly mixed with the binder at a temperature of 145 ± 5°C. The conventional and the rheological properties were determined for the penetration grade 60–70 control binder as well as binders modified by 3, 5 and 7% of NMMT and NSD by the weight of asphalt. The optimum nanomaterial content was found for each modifier and was then used for preparing asphalt mixtures by the conventional Marshall method. Finally, Witczak 1-40D complex shear modulus (G*) based predictive model was used to estimate the dynamic modulus (E*) for the control and nanomodified asphalt mixtures. The field performance in terms of asphalt concrete (AC) layer rutting and fatigue cracking was predicted using the QRSS software for two typical pavement sections and three different climatic locations in Egypt (Alexandria, Cairo and Aswan). The simulation runs revealed that both nanomodified asphalt mixtures exhibited superior pavement performance in terms of AC rutting compared to the control mix without a significant effect on fatigue life.

摘要

本文着重于使用质量相关规范软件（QRSS）预测用纳米蒙脱土（NMMT）和纳米二氧化硅（NSD）改性的沥青混合料的性能，这是对路面ME设计的简化。纳米材料在145±5°C的温度下与粘合剂充分混合。常规和流变性能是针对渗透等级为60-70的对照粘合剂以及经沥青重量分别被NMMT和NSD改性的5％，7％和7％改性的粘合剂而确定的。找到每种改性剂的最佳纳米材料含量，然后通过常规的马歇尔方法将其用于制备沥青混合物。最后，使用基于Witczak 1-40D复数剪切模量（G *）的预测模型来估算对照和纳米改性沥青混合物的动态模量（E *）。使用QRSS软件预测了埃及两个典型的人行道断面和三个不同气候位置（亚历山大，开罗和阿斯旺）的沥青混凝土（AC）车辙和疲劳裂纹方面的现场性能。模拟运行表明，两种纳米改性沥青混合物在交流车辙方面均表现出优于对照混合物的优异路面性能，而对疲劳寿命没有显着影响。