Effects of Curing Conditions on the MECHANICAL and Microstructural Properties of Ultra-High-Performance Concrete (UHPC) Incorporating Iron Tailing Powder

It has been reported that iron tailing powder (ITP) has the potential to partially replace cement to prepare ultra-high-performance concrete (UHPC). However, the reactivity of ITP particles in concrete largely depends on the curing method. This study investigates the effects of curing conditions on...

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Bibliographic Details
Published in:Materials 2021-01, Vol.14 (1), p.215
Main Authors: Lu, Dong, Zhong, Jing, Yan, Baobao, Gong, Jing, He, Ziye, Zhang, Guanhua, Song, Chengzhe
Format: Article
Language:English
Subjects:
Cement
Concrete
Curing
Energy consumption
Hydration
Investigations
Iron
Mechanical properties
Microstructure
Morphology
Particle size
Portland cements
Scanning electron microscopy
Steam curing
Ultra high performance concrete
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Summary:It has been reported that iron tailing powder (ITP) has the potential to partially replace cement to prepare ultra-high-performance concrete (UHPC). However, the reactivity of ITP particles in concrete largely depends on the curing method. This study investigates the effects of curing conditions on the mechanical and microstructural properties of UHPC containing ITP. To achieve this objective, three research tasks are conducted, including (1) preparing seven concrete formulations by introducing ITP; (2) characterizing their mechanical performance under different curing regimes; and (3) analyzing their microstructure by XRD patterns, FTIR analysis, and SEM observation. The experimental results show that there is an optimum ITP dosage (15%) for their application. The concrete with 15% ITP under standard curing obtains 94.3 MPa at 7 days, their early-age strength could be even further increased by ~30% (warm-water curing) and ~35% (steamed curing). The steam curing regime stimulates the activity of ITP and refines the microstructure. This study demonstrates the potential of replacing Portland cement with ITP in UHPC production.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14010215