Effects of the mineralogical composition and particle size distribution of ladle furnace slag as a cement/fine aggregate replacement in concrete

被引:4
作者
Araos, P. [1 ]
Montano, T. [1 ]
Valls, S. [1 ]
Barra, M. [1 ]
Aponte, D. [1 ]
机构
[1] Univ Politecn Catalunya BarcelonaTech, Dept Civil & Environm Engn, Barcelona, Spain
关键词
Concrete; Ladle furnace slag; Mechanical properties; Volumetric instability; Microstructure; HYDRAULIC-PROPERTIES; STEEL SLAG; HYDRATION; BEHAVIOR;
D O I
10.3989/mc.2023.301422
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Ladle furnace slag (LFS) shows excellent potential for valorization. Despite this, landfills are typically its final destination, mainly because of technological barriers in its valorization process. This work examines the potential use of LFS as a partial cement/fine aggregate replacement, focusing on the effects of LFS composition and particle size distribution on concrete physico-mechanical properties. Chemical/mineralogical characterization of raw/hydrated samples, fresh-/hardened-state concrete properties, and volumetric instability tests were evaluated. Our results show reduced mechanical performance with LFS replacement, reaching compressive strength values of 32-42 MPa after 28 days. LFS mineralogical characterization reveals the absence of free CaO and the presence of periclase with its hydration/carbonation products. Therefore, the weathering/maturity process mainly affects free CaO. Furthermore, the observed volumetric instability issues were within the Code on Structural Concrete (Spanish abbreviation: EHE) established limits (0.04%), suggesting that the remaining periclase could be responsible for this expansive behavior.
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页数:11
相关论文
共 45 条
[1]   Ladle slag cement - Characterization of hydration and conversion [J].
Adesanya, Elijah ;
Sreenivasan, Harisankar ;
Kantola, Anu M. ;
Telkki, Ville-Veikko ;
Ohenoja, Katja ;
Kinnunen, Paivo ;
Illikainen, Mirja .
CONSTRUCTION AND BUILDING MATERIALS, 2018, 193 :128-134
[2]   Influence of mineralogy on the hydraulic properties of ladle slag [J].
Adolfsson, Daniel ;
Robinson, Ryan ;
Engstrom, Fredrik ;
Bjorkman, Bo .
CEMENT AND CONCRETE RESEARCH, 2011, 41 (08) :865-871
[3]   Cementitious Phases in Ladle Slag [J].
Adolfsson, Daniel ;
Engstrom, Fredrik ;
Robinson, Ryan ;
Bjorkman, Bo .
STEEL RESEARCH INTERNATIONAL, 2011, 82 (04) :398-403
[4]   Behavior of self compacting concrete containing ladle furnace slag and steel fiber reinforcement [J].
Anastasiou, Eleftherios K. ;
Papayianni, Ioanna ;
Papachristoforou, Michail .
MATERIALS & DESIGN, 2014, 59 :454-460
[5]  
[Anonymous], 2020, UNE-EN 12390-3 Standard
[6]  
[Anonymous], 2020, 123507 UNEEN AENOR
[7]  
[Anonymous], 2019, C1038C1038M19 ASTM, DOI [10.1520/C0109_C0109M, DOI 10.1520/C0109_C0109M]
[8]  
[Anonymous], 2020, UNE-EN 12350-2 Standard
[9]  
[Anonymous], 2011, Bs En, V197, P50
[10]  
[Anonymous], 2012, UNE-EN 933-1