Complete Replacement of Mineral Raw Materials in Asphalt Concrete by Steel & Iron Slags Based on Cascade Utilization Strategy

被引：0

作者：

Chen Z.-W. ^{[1
,2
,3
]}

Leng Z. ^{[1
]}

Xiao Y. ^{[4
]}

Jiang J.-W. ^{[1
]}

Jiao Y.-Y. ^{[2
]}

Wu S.-P. ^{[4
]}

Xie J. ^{[4
]}

Cai J. ^{[5
]}

机构：

[1] Faculty of Construction and Environment, The Hong Kong Polytechnic University, Hong Kong

[2] Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan

[3] Key Laboratory of Road Structure and Material of Ministry of Transport, Changsha University of Science & Technology, Changsha

[4] State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan

[5] Key Laboratory of Special Environment Road Engineering of Hunan Province, Changsha University of Science & Technology, Changsha

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2021年 / 34卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Asphalt concrete; Cascade utilization; Engineering performance; Experimental research; Material characteristics; Road engineering; Steel slag and iron slag;

D O I：

10.19721/j.cnki.1001-7372.2021.10.015

中图分类号：

学科分类号：

摘要：

Steel slag and iron slag, generating during steelmaking process, are two typical solid wastes. Currently, only partial steel slag is used to replace coarse aggregates in asphalt concrete. To further increase the reuse efficiency of steel and iron slag, this study evaluated the feasibility of using steel slag and iron slag with different sizes to completely replace the mineral raw materials in asphalt concrete. Two main studies were conducted. First, the material characteristics of steel slag and iron slag were analyzed using some microscopic analysis techniques of materials and test methods of the basic technical indexes of the aggregate. A suitable size combination scheme of steel slag and iron slag to completely replace mineral raw materials in asphalt concrete was proposed. Second, the feasibility of the proposed scheme was verified. All asphalt concretes were designed using the Superpave method. The mixing procedure of the asphalt mixture was modified, and the main engineering performances of the asphalt concrete were checked. The results suggest that the cementitious activity of the steel slag makes steel slag fine aggregate (SSFA) consolidated, and some technical indexes of the iron slag coarse aggregate (ISCA) are not good. Hence, SSFA and ISCA cannot be used to directly replace mineral raw materials in asphalt concrete. Asphalt concrete, with mineral raw materials completely replaced by steel slag coarse aggregate (SSCA), iron slag fine aggregate (ISFA), and steel slag powder (SSP) filler, mixed with SBS-modified asphalt under a modified mixing procedure, shows satisfactory engineering performances. Some performances are significantly better than those of limestone-based asphalt concrete. The high-temperature flow number (Fn) and low-temperature fracture energy are 18% and 23% higher, respectively. This work has proved that the cascade utilization of steel slag and iron slag in asphalt concrete can be done based on their size combination. © 2021, Editorial Department of China Journal of Highway and Transport. All right reserved.

引用

页码：190 / 203

页数：13

共 30 条

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