Yao Liyang, Gao Wenying, Ma Xianwei, Fu Hao
School of Civil and Transportation Engineering, Henan University of Urban Construction, Pingdingshan 467036, China.
Materials (Basel). 2020 Mar 3;13(5):1122. doi: 10.3390/ma13051122.
In this work, related performances of asphalt binders with Bayer red mud powder (RMP) were studied. RMP replaced the traditional limestone powder (LSP) as a filler in asphalt binder. The replacement rates were 0%, 25%, 50%, 75%, and 100%, respectively. In this study, seven F/A (filler-to-asphalt, weight/weight) ratios for each of the fillers were selected: 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, and 2.1. Penetration, softening point, rotational viscosity (RV), dynamic shear rheometry (DSR), and bending beam rheometry (BBR) tests were used to evaluate the properties of the asphalt binder. Penetration into the asphalt binder decreases linearly with increasing F/A ratio. Moreover, penetration of binder with RMP is lower than that of asphalt binder with LSP (RMP0), and among the five fillers tested, RMP100 showed most significant influence on penetration of the asphalt binder. The addition of RMP increases the softening point of the binder. DSR results show that the improvement in the high temperature performance is most significant after replacing 75% of the LSP with Bayer RMP. BBR results show that with increasing substitution of RMP for LSP, the creep stiffness (S) increased while the rate of change of S (m-value) declined. The low temperature performance of every asphalt binder was not enough to meet the Superpave requirements. In order to meet the Superpave requirements for S and m-values, the maximum F/A ratios of the five replacements corresponding to the fillers with 0%, 25%, 50%, 75%, and 100% RMP, were 1.3, 1.2, 1.1, 1.0 and 0.9, respectively. At 135 °C, rotational viscosity showed that RMP75 and RMP100 with a maximum F/A ratio of 1.1 are the best choices for asphalt binders, considering economic and construction requirements.
在这项工作中，研究了含有拜耳赤泥粉（RMP）的沥青结合料的相关性能。RMP替代传统的石灰石粉（LSP）作为沥青结合料中的填料。替代率分别为0%、25%、50%、75%和100%。在本研究中，为每种填料选择了七个F/A（填料与沥青，重量/重量）比：0.3、0.6、0.9、1.2、1.5、1.8和2.1。采用针入度、软化点、旋转粘度（RV）、动态剪切流变仪（DSR）和弯曲梁流变仪（BBR）试验来评估沥青结合料的性能。针入度随F/A比的增加呈线性下降。此外，含RMP的结合料的针入度低于含LSP的沥青结合料（RMP0），在所测试的五种填料中，RMP100对沥青结合料针入度的影响最为显著。RMP的添加提高了结合料的软化点。DSR结果表明，用拜耳RMP替代75%的LSP后，高温性能的改善最为显著。BBR结果表明，随着RMP替代LSP比例的增加，蠕变劲度（S）增加，而S的变化率（m值）下降。每种沥青结合料的低温性能均不足以满足Superpave要求。为了满足Superpave对S和m值的要求，对应于0%、25%、50%、75%和100%RMP填料的五种替代物的最大F/A比分别为1.3、1.2、1.1、1.0和0.9。在135℃时，旋转粘度表明，考虑到经济和施工要求，最大F/A比为1.1 的RMP75和RMP100是沥青结合料的最佳选择。
