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Structural Engineering and Mechanics Volume 61, Number 6, March25 2017 , pages 711-719 DOI: https://doi.org/10.12989/sem.2017.61.6.711 |
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Effect of cover depth and rebar diameter on shrinkage behavior of ultra-high-performance fiber-reinforced concrete slabs |
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Doo-Yeol Yoo, Ki-Yeon Kwon, Jun-Mo Yang and Young-Soo Yoon
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| Abstract | ||
| This study investigates the effects of reinforcing bar diameter and cover depth on the shrinkage behavior of restrained ultra-high-performance fiber-reinforced concrete (UHPFRC) slabs. For this, twelve large-sized UHPFRC slabs with three different rebar diameters (db=9.5, 15.9, and 22.2 mm) and four different cover depths (h=5, 10, 20, and 30 mm) were fabricated. In addition, a large-sized UHPFRC slab without steel rebar was fabricated for evaluating degree of restraint. Test results revealed that the uses of steel rebar with a large diameter, leading to a larger reinforcement ratio, and a low cover depth are unfavorable regarding the restrained shrinkage performance of UHPFRC slabs, since a larger rebar diameter and a lower cover depth result in a higher degree of restraint. The shrinkage strain near the exposed surface was high because of water evaporation. However, below a depth of 18 mm, the shrinkage strain was seldom influenced by the cover depth; this was because of the very dense microstructure of UHPFRC. Finally, owing to their superior tensile strength, all UHPFRC slabs with steel rebars tested in this study showed no shrinkage cracks until 30 days. | ||
| Key Words | ||
| ultra-high-performance fiber-reinforced concrete; slab; shrinkage; degree of restraint; steel rebar; cover depth; rebar diameter | ||
| Address | ||
| Doo-Yeol Yoo: Department of Architectural Engineering, Hanyang University, Seoul, Korea Ki-Yeon Kwon: Structural Systems & Site Evaluation Department, Korea Institute of Nuclear Safety, Daejeon, Korea Jun-Mo Yang: Steel Structure Research Group, POSCO, Incheon, Korea Young-Soo Yoon: School of Civil, Environmental and Architectural Engineering, Korea University, Seoul, Korea | ||