Characteristics and reactivity of ferronickel slag powder
Characteristics and reactivity of ferronickel slag powder
复制标题
镍铁渣粉的特性及反应活性
DOI：
10.1016/j.conbuildmat.2017.09.038
复制
发表时间：
2017-12-15
影响因子：
7.4
通讯作者：
Shi, Mengxiao
中科院分区：
文献类型：
--
作者：
Huang, Yiduo;Wang, Qiang;Shi, Mengxiao
研究了掺30%镍铁渣粉的混合水泥的水化性能。在非碱性条件下，电炉镍铁渣（EFS）和高炉镍铁渣（BFS）的活性都很低。由于BFS粉末中的CaO和Al 2 O3含量较高，而MgO含量较低，因此BFS粉末比EFS粉末具有更高的火山灰活性。镍铁渣在水泥中的反应降低了水化硅酸钙（C-S-H）凝胶的Ca/Si比，并增加了硅酸盐链的聚合度。EFS粉末倾向于粗化硬化浆体的孔结构，并降低混凝土在任何年龄的抗压强度;另一方面，包含BFS粉末的混凝土表现出接近或甚至上级于普通水泥混凝土的后期微观结构和强度。镍铁渣粉提高了混凝土的抗氯离子渗透性能，其中BFS粉的效果更为显著。(C)2017爱思唯尔有限公司版权所有
In this study, the hydration properties of a blended cement containing 30% ferronickel slag powder are investigated. The activities of electric arc furnace ferronickel slag (EFS) powder and blast furnace ferronickel slag (BFS) powder are both very low under non-alkaline conditions. Due to its higher CaO and Al2O3 contents and lower MgO content, the BFS powder exhibits higher pozzolanic activity than the EFS powder. The reaction of ferronickel slag in the cement decreases the Ca/Si ratio of the calcium silicate hydrate (C-S-H) gel and increases the degree of polymerization of the silicate chains. EFS powder tends to coarsen the pore structure of the hardened paste and decreases the compressive strength of concrete at any age; on the other hand, concrete containing the BFS powder exhibits a late-age microstructure and strength close to or even superior to that of plain cement concrete. Ferronickel slag powder improves the resistance of concrete to chloride ion penetration and the effect of BFS powder is more substantial. (C) 2017 Elsevier Ltd. All rights reserved.