Chen Meng, Javilla Barugahare, Hong Wei, Pan Changluan, Riara Martin, Mo Liantong, Guo Meng
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
Department of Physical sciences, South Eastern Kenya University, Kitui 170-90200, Kenya.
Materials (Basel). 2019 Jan 2;12(1):128. doi: 10.3390/ma12010128.
This paper investigated the rheological properties of asphalt binder, asphalt mastic and asphalt mortar and the interaction between asphalt binder, mineral filler and fine aggregates. Asphalt binder, mastic and mortar can be regarded as the binding phase at different scales in asphalt concrete. Asphalt mastic is a blend of asphalt binder and mineral filler smaller than 0.075 mm while asphalt mortar consists of asphalt binder, mineral filler and fine aggregate smaller than 2.36 mm. The material compositions of mastic and mortar were determined from the commonly used asphalt mixtures. Dynamic shear rheometer was used to conduct rheological analysis on asphalt binder, mastic and mortar. The obtained test data on complex modulus and phase angle were used for the construction of rheological master curves and the investigation of asphalt-filler/aggregate interaction. Test results indicated a modulus increase of three- to five-fold with the addition of filler and a further increase of one to two orders of magnitude with cumulative addition of fine aggregates into asphalt binder. Fine aggregates resulted in a phase change for mortar at high temperatures and low frequencies. The filler had stronger physical interaction than fine aggregate with an interaction parameter of 1.8⁻2.8 and 1.15⁻1.35 respectively. Specific area could enhance asphalt-filler interaction. The mastic and mortar modulus can be well predicted based on asphalt binder modulus by using particle filling effect. Asphalt mortar had a significant modulus reinforcement and phase change and thus could be the closest subscale in terms of performance to that of asphalt mixtures. It could be a vital scale that bridges the gap between asphalt binder and asphalt mixtures in multiscale performance analysis.
本文研究了沥青结合料、沥青玛蹄脂和沥青胶浆的流变特性，以及沥青结合料、矿粉和细集料之间的相互作用。沥青结合料、玛蹄脂和胶浆可被视为沥青混凝土中不同尺度的粘结相。沥青玛蹄脂是沥青结合料与粒径小于0.075mm的矿粉的混合物，而沥青胶浆则由沥青结合料、矿粉和粒径小于2.36mm的细集料组成。玛蹄脂和胶浆的材料组成由常用的沥青混合料确定。采用动态剪切流变仪对沥青结合料、玛蹄脂和胶浆进行流变分析。将得到的复数模量和相位角试验数据用于构建流变主曲线，并研究沥青-填料/集料相互作用。试验结果表明，添加填料后模量增加了三到五倍，在沥青结合料中累积添加细集料后模量进一步增加了一到两个数量级。细集料导致胶浆在高温和低频下发生相变。填料比细集料具有更强的物理相互作用，相互作用参数分别为1.8⁻2.8和1.15⁻1.35。比表面积可增强沥青-填料相互作用。利用颗粒填充效应，基于沥青结合料模量可以很好地预测玛蹄脂和胶浆的模量。沥青胶浆具有显著的模量增强和相变，因此在性能方面可能是最接近沥青混合料的子尺度。在多尺度性能分析中，它可能是连接沥青结合料和沥青混合料之间差距的关键尺度。
