Lv Yang, Wu Shaopeng, Cui Peide, Amirkhanian Serji, Xu Haiqin, Zou Yingxue, Yang Xinkui
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
School of Transportation, Southeast University, Jiulonghu, Nanjing 211189, China.
Materials (Basel). 2022 May 19;15(10):3635. doi: 10.3390/ma15103635.
The use of steel slag powder instead of filler to prepare asphalt mortar was beneficial to realize the effective utilization of steel slag and improve the performance of asphalt concrete. Nevertheless, the anti-aging properties of steel-slag powder-asphalt mortar need to be further enhanced. This study used antioxidants and UV absorbers in steel-slag powder-asphalt mortar to simultaneously improve its thermal-oxidation and UV-aging properties. The dosage of modifier was optimized by second-generation non-inferior sorting genetic algorithm. Fourier-Transform Infrared Spectroscopy, a dynamic shear rheometer and the heavy-metal-ion-leaching test were used to evaluate the characteristic functional groups, rheological properties and heavy-metal-toxicity characteristics of the steel-slag-powder-modified asphalt mortar, respectively. The results showed that there was a significant correlation between the amount of modifier and G*, δ, and the softening point. When the first peak appeared for G*, δ, and the softening point, the corresponding dosages of were 2.15%, 1.0%, and 1.1%, respectively, while the corresponding dosage of were 0.25%, 0.76%, and 0.38%, respectively. The optimal value of the modifier dosage was 1.2% and was 0.5% after weighing by the NSGA-II algorithm. The asphalt had a certain physical solid-sealing effect on the release of heavy-metal ions in the steel-slag powder. In addition, the asphalt structure was changed under the synergistic effect of oxygen and ultraviolet rays. Therefore, the risk of leaching heavy-metal ions was increased with the inferior asphalt-coating performance on the steel-slag powder.
使用钢渣粉替代填料制备沥青胶浆有利于实现钢渣的有效利用并提高沥青混凝土的性能。然而，钢渣粉沥青胶浆的抗老化性能仍需进一步提高。本研究在钢渣粉沥青胶浆中使用抗氧化剂和紫外线吸收剂，以同时改善其热氧化和紫外线老化性能。通过第二代非劣排序遗传算法对改性剂用量进行优化。分别采用傅里叶变换红外光谱、动态剪切流变仪和重金属离子浸出试验来评价钢渣粉改性沥青胶浆的特征官能团、流变性能和重金属毒性特征。结果表明，改性剂用量与G*、δ和软化点之间存在显著相关性。当G*、δ和软化点出现第一个峰值时，相应的[具体成分1]用量分别为2.15%、1.0%和1.1%，而相应的[具体成分2]用量分别为0.25%、0.76%和0.38%。经NSGA-II算法加权后，改性剂用量[具体成分1]的最优值为1.2%，[具体成分2]为0.5%。沥青对钢渣粉中重金属离子的释放具有一定的物理密封作用。此外，在氧气和紫外线的协同作用下，沥青结构发生变化。因此，随着钢渣粉上沥青包覆性能变差，重金属离子浸出风险增加。
