Interfacial transition zone of cement composites with steel furnace slag aggregates

被引：65
作者：
Brand, Alexander S. [1 ,2 ]
Roesler, Jeffery R. [1 ]
机构：
[1] Univ Illinois, Dept Civil & Environm Engn, 205 N Mathews Ave, Urbana, IL 61801 USA
[2] NIST, Mat & Struct Syst Div, 100 Bur Dr, Gaithersburg, MD 20899 USA
来源：
CEMENT & CONCRETE COMPOSITES | 2018年 / 86卷
关键词：
Interfacial transition zone (ITZ); Microstructure; Scanning electron microscopy (SEM); Steel furnace slag (SFS); Basic oxygen furnace (BOF) slag; Electric arc furnace (EAF) slag; Ladle metallurgy furnace (LMF) slag; CALCIUM HYDROXIDE; IMAGE-ANALYSIS; CONCRETE; ITZ; PASTE; STRENGTH; AGE;
D O I：
10.1016/j.cemconcomp.2017.11.012
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
As previous studies of mortar and concrete with steel furnace slag (SFS) aggregates have shown increases or decreases in the bulk mechanical properties, this study investigated the microstructural cause of these opposing trends through characterization of the interfacial transition zone (ITZ) with quantitative image analysis of backscatter electron micrographs. Three SFS types basic oxygen furnace (BOF), electric arc furnace (EAF), EAF/ladle metallurgy furnace (EAF/LMF) were examined as aggregates in a portland cement mortar. The ITZ size for all SFS mortar mixtures was similar, with the ITZ of BOF and EAF/LMF being slightly more porous than mortar mixtures with EAF or dolomite. Microstructural examinations of the SFS particle revealed that BOF and EAF/LMF aggregates have different outer and interior compositions, with the outer composition consisting of a porous layer, which likely contributes to the reduced strength relative to EAF. The imaging results demonstrated that the type of SFS and its spatial composition greatly influences the bulk properties of mortar and concrete, mainly as a function of porosity content in the ITZ and the outer layer and interior porosity of the SFS aggregate. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：117 / 129
页数：13
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