采用FNS细集料的混凝土耐久性研究。

Study on the durability of concrete with FNS fine aggregate.

作者信息

Liu Xiaoming, Li Tingyu, Tian Weiguang, Wang Yiqun, Chen Yanhu

机构信息

School of Civil Engineering, Central South University, Changsha, 410075, China.

Guangdong Guangqing Metal Technology Co. Ltd., Yangjiang, 529533, China.

出版信息

J Hazard Mater. 2020 Jan 5;381:120936. doi: 10.1016/j.jhazmat.2019.120936. Epub 2019 Jul 29.

DOI:10.1016/j.jhazmat.2019.120936

PMID:31377577

Abstract

As a by-product of nickel production, the ferronickel slag (FNS) puts a lot of pressure on the environment. It is becoming more and more urgent to deal with the increasing FNS. The aim of this study is to explore the durability of concrete with FNS fine aggregate. Two kinds of FNS with different storage time were selected. The radioactivity detection, XRD test and stability detection of FNS were conducted to ensure FNS can be used as construction materials. Then the durability of concrete with 13%, 27%, 40% and 50% FNS (by weight of fine aggregate) was investigated, respectively. It was found that the properties of concrete prepared from FNS with different storage time had little difference. The results indicated that 27% FNS replacement showed improvement in resistance to sulfate attack by 22% but the resistance to chloride ion penetration was not significantly influenced. Moreover, 40% FNS addition brought a 33% abrasion reduction than that of original concrete. SEM analysis showed that FNS produced more C-S-H gels and improved the microstructure of concrete. This study indicated that proper content of FNS can be used as fine aggregate and it was beneficial to the durability of concrete, especially to the abrasion resistance.

摘要

作为镍生产的副产品，镍铁渣（FNS）给环境带来了很大压力。处理日益增加的镍铁渣变得越来越紧迫。本研究的目的是探索使用镍铁渣细骨料的混凝土的耐久性。选择了两种储存时间不同的镍铁渣。对镍铁渣进行放射性检测、XRD测试和稳定性检测，以确保镍铁渣可作为建筑材料使用。然后分别研究了用13%、27%、40%和50%（按细骨料重量计）镍铁渣配制的混凝土的耐久性。结果发现，由不同储存时间的镍铁渣制备的混凝土性能差异不大。结果表明，27%的镍铁渣替代量使混凝土的抗硫酸盐侵蚀性能提高了22%，但对氯离子渗透的抗性没有显著影响。此外，添加40%的镍铁渣使混凝土的磨损比原始混凝土降低了33%。扫描电子显微镜分析表明，镍铁渣产生了更多的C-S-H凝胶，改善了混凝土的微观结构。本研究表明，适量的镍铁渣可作为细骨料使用，有利于提高混凝土的耐久性，尤其是耐磨性。