复合再生冶金矿渣粉提高沥青混合料抗水损害性能的研究

Research on Improving Moisture Resistance of Asphalt Mixture with Compounded Recycled Metallurgical Slag Powders.

作者信息

Gao Bo, Xu Haiqin, Wu Shaopeng, Wang Huan, Yang Xinkui, Chen Pengrui

机构信息

State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.

出版信息

Materials (Basel). 2024 Jul 15;17(14):3499. doi: 10.3390/ma17143499.

DOI:10.3390/ma17143499

PMID:39063792

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11278165/

Abstract

The utilization of steel slag as an alternative material in asphalt mixtures is considered the solution to the problem of the shortage of natural aggregates. However, asphalt mixtures with steel slag show susceptibility to damage caused by moisture, especially in powder form. Therefore, blast furnace slag powders were used to compound with steel slag powders as fillers to improve the moisture resistance of asphalt mixtures. The characteristics of the steel slag powders and blast furnace slag powders were investigated initially. Subsequently, the adhesion properties of the asphalt mastics with the powders to the aggregates were evaluated. Finally, the moisture resistances of the asphalt mixtures were identified. The results indicate that the steel slag powder exhibited a notable prevalence of surface pores, which had a more uniform size distribution. In contrast, the blast furnace slag powder exhibited a greater average pore size. The larger specific surface area of the steel slag powder was over 30% larger than that of the blast furnace slag powder, and the superior gelling activity of the blast furnace powder enhanced the adhesion property. Both the steel slag powder and blast furnace slag powder were found to enhance the adhesion properties of the asphalt mastics, while the effect of the steel slag powder was more pronounced, the maximum force difference of which exceeded 200 N. The antagonistic effect of the steel slag powder and blast furnace slag powder on the resistance of the adhesive interface to moisture damage was confirmed by the contact angle test. The incorporation of the blast furnace slag powder markedly enhanced the moisture resistances of the asphalt mixtures. The phenomenon of dynamic moisture damage to the asphalt mixtures was more pronounced under the multicycle times, obviously severer than that in a stable water environment. As the dynamic moisture cycles increased, the degree of destruction gradually approached a steady state.

摘要

将钢渣用作沥青混合料的替代材料被认为是解决天然集料短缺问题的方法。然而，含钢渣的沥青混合料易受水分破坏，尤其是粉末形式的钢渣。因此，使用高炉矿渣粉与钢渣粉复合作为填料来提高沥青混合料的抗湿性。首先研究了钢渣粉和高炉矿渣粉的特性。随后，评估了含这些粉末的沥青胶浆与集料之间的粘附性能。最后，确定了沥青混合料的抗湿性。结果表明，钢渣粉表面孔隙显著居多，且尺寸分布更均匀。相比之下，高炉矿渣粉的平均孔径更大。钢渣粉的比表面积比高炉矿渣粉大30%以上，而高炉矿渣粉优越的胶凝活性增强了粘附性能。发现钢渣粉和高炉矿渣粉均能增强沥青胶浆的粘附性能，其中钢渣粉的效果更显著，其最大力差超过200N。通过接触角试验证实了钢渣粉和高炉矿渣粉对粘合剂界面抗水分破坏的拮抗作用。掺入高炉矿渣粉显著提高了沥青混合料的抗湿性。在多循环次数下，沥青混合料的动态水分破坏现象更明显，明显比在稳定水环境中严重。随着动态水分循环次数增加，破坏程度逐渐趋于稳定状态。