Zhang Quanmin, Lu Ziyu, Chen Anqi, Wu Shaopeng, Feng Jianlin, Xu Haiqin, Li Yuanyuan
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, China.
Materials (Basel). 2024 Sep 13;17(18):4513. doi: 10.3390/ma17184513.
Ultra-thin overlays (UTOL) are a standard highway pre-maintenance method used to improve the road surface performance of asphalt pavements and to repair minor rutting and cracking. However, the thin thickness makes it very sensitive to external changes, which increases its wear and shortens its life. So, this paper aims to prepare a durable and skid-resistance asphalt ultra-thin overlay using epoxy asphalt (EA) and steel slag. First, the physical properties of EA were characterized by penetration, softening point, flexibility, and kinematic viscosity tests. The dynamic shear rheometer (DSR) test characterizes EA's rheological properties. Differential Scanning Calorimetry (DSC), kinematic viscosity, and Fourier transform infrared spectroscopy (FTIR) characterized the EA's curing process. Finally, the pavement performance of an epoxy ultra-thin overlay (EUTOL) prepared with EA and steel slag was tested. The results show that the epoxy resin particles increase with the increase in epoxy resin dosage, and at 40%, its epoxy particles are uniformly distributed with the most significant area share. With the addition of epoxy resin, the needle penetration of EA decreases and then increases, the flexibility decreases at a slower rate, and the softening point rises significantly. Moreover, the growth of the elastic component in EA significantly improved the high-temperature viscoelastic properties. Considering its physical and rheological properties, the optimal doping amount of 40% was selected. By analyzing the curing behavior of EA (optimum dosage), the combination temperature of EA is 150 °C, which meets the needs of mixing and paving asphalt mixtures. After 12 h of maintenance at 120 °C, its reaction is sufficient. The skid-resistance durability, high-temperature, low-temperature, water stability, and fatigue resistance of UTOL can be effectively improved using steel slag coarse aggregate.
超薄罩面（UTOL）是一种标准的公路预防性养护方法，用于改善沥青路面的路面性能，并修复轻微车辙和裂缝。然而，其薄厚度使其对外部变化非常敏感，这增加了其磨损并缩短了其使用寿命。因此，本文旨在使用环氧沥青（EA）和钢渣制备一种耐用且防滑的沥青超薄罩面。首先，通过针入度、软化点、柔韧性和运动粘度试验对EA的物理性能进行了表征。动态剪切流变仪（DSR）试验表征了EA的流变性能。差示扫描量热法（DSC）、运动粘度和傅里叶变换红外光谱（FTIR）表征了EA的固化过程。最后，对用EA和钢渣制备的环氧超薄罩面（EUTOL）的路面性能进行了测试。结果表明，随着环氧树脂用量的增加，环氧树脂颗粒增多，在40%时，其环氧颗粒分布均匀，面积占比最大。随着环氧树脂的加入，EA的针入度先减小后增大，柔韧性下降速率较慢，软化点显著升高。此外，EA中弹性成分的增加显著改善了其高温粘弹性。综合考虑其物理和流变性能，选择40%的最佳掺量。通过分析EA（最佳用量）的固化行为，EA的结合温度为150℃，满足沥青混合料搅拌和摊铺的要求。在120℃养护12 h后，其反应充分。使用钢渣粗集料可有效提高UTOL的防滑耐久性、高温、低温、水稳定性和抗疲劳性能。
