Wang Decai, Wei Jiawei, Wu Zongyuan, Hu Lei, Yang Lan, Cheng Kai
School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China.
School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou, 450001, China.
Sci Rep. 2025 Jan 6;15(1):973. doi: 10.1038/s41598-025-85377-5.
In order to solve the problems of rutting and early fatigue cracks in emulsified asphalt cold recycled pavement, and the shortage of natural stone resources and new environmental hazards caused by the use of traditional limestone powder filler. In this study, coal gangue powder was added to prepare Emulsified Asphalt Mastic (EAM) to improve the rheological properties and fatigue performance. A series of tests, including frequency scanning, temperature scanning, Multiple Stress Creep Recovery (MSCR), Linear Amplitude Scanning (LAS), and Fourier Transform Infrared spectroscopy (FTIR) were conducted. Through rheology theory, viscoelastic damage theory, the impact of three fillers: Coal Gangue Powder (CGP), Limestone Powder (LP) and Portland Cement (PC), as well as four kinds of Powder-Binder ratios (P/B) (0.6, 0.9, 1.2, 1.5) on the high temperature rheology and medium temperature fatigue performance of EAM was analyzed. The findings reveal that the filler content has a great influence on the proportion of viscoelastic components of EAM in the low frequency domain. The complex shear modulus (G*) and phase angle (δ) of EAM were suitable for Christensen-Anderson-Marasteanu model (CAM) model in the wide frequency domain. Increasing the filler content and Rotating Thin Film Oven Test (RTFOT) aging can improve the high-temperature stability and stress sensitivity of EAM, but it reduced its fatigue resistance. The high temperature performance of EAM containing PC and CGP exhibit superior high-temperature performance compared to LP fillers. Conversely, LP mastic demonstrate superior anti-fatigue performance under actual strain levels in both thin and thick asphalt pavement layers, surpassing the performance of PC mastic and CGP mastic. Therefore, coal gangue powder can be used as a new type of green filler to replace limestone powder. An appropriate amount of incorporation can improve the high temperature stability of the mortar and does not have a huge impact on the fatigue performance. The most suitable range of P/B is identified as 0.6-1.0 when utilizing LP as the filler, 1.2-1.5 when utilizing PC or CGP as the filler.
为了解决乳化沥青冷再生路面的车辙和早期疲劳裂缝问题，以及传统石灰石粉填料使用导致的天然石材资源短缺和新的环境危害。在本研究中，添加煤矸石粉制备乳化沥青玛蹄脂（EAM）以改善其流变性能和疲劳性能。进行了一系列试验，包括频率扫描、温度扫描、多重应力蠕变恢复（MSCR）、线性振幅扫描（LAS）和傅里叶变换红外光谱（FTIR）。通过流变学理论、粘弹性损伤理论，分析了三种填料：煤矸石粉（CGP）、石灰石粉（LP）和波特兰水泥（PC），以及四种粉胶比（P/B）（0.6、0.9、1.2、1.5）对EAM高温流变性能和中温疲劳性能的影响。研究结果表明，填料含量对EAM在低频域粘弹性组分比例有很大影响。EAM的复数剪切模量（G*）和相位角（δ）在宽频域内适合Christensen-Anderson-Marasteanu模型（CAM）。增加填料含量和旋转薄膜烘箱试验（RTFOT）老化可以提高EAM的高温稳定性和应力敏感性，但会降低其抗疲劳性。与LP填料相比，含PC和CGP的EAM高温性能表现出更优异的高温性能。相反，在薄沥青面层和厚沥青面层的实际应变水平下，LP玛蹄脂表现出更优异的抗疲劳性能，超过了PC玛蹄脂和CGP玛蹄脂的性能。因此，煤矸石粉可作为一种新型绿色填料替代石灰石粉。适量掺入可提高胶浆的高温稳定性，且对疲劳性能影响不大。当使用LP作为填料时，最合适的P/B范围为0.6-1.0；当使用PC或CGP作为填料时，最合适的P/B范围为1.2-1.5。
