Shrinkage and Cracking of Restrained Ultra-High-Performance Fiber-Reinforced Concrete Slabs at Early Age
- Authors
- Yoo, Doo Yeol; Min, Kyung-Hwan; Lee, Joo-Ha; Yoon, Young-Soo
- Issue Date
- Dec-2014
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Ultra-high-performance fiber-reinforced concrete; Slab; Time-zero; Shrinkage; Cracking resistance; Shrinkage-reducing admixture; Expansive admixture
- Citation
- CONSTRUCTION AND BUILDING MATERIALS, v.73, pp.357 - 365
- Indexed
- SCIE
SCOPUS
- Journal Title
- CONSTRUCTION AND BUILDING MATERIALS
- Volume
- 73
- Start Page
- 357
- End Page
- 365
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158325
- DOI
- 10.1016/j.conbuildmat.2014.09.097
- ISSN
- 0950-0618
- Abstract
- In this study, the combined effect of shrinkage-reducing admixture (SRA) and expansive admixture (EA) on the shrinkage and cracking behaviors of restrained ultra-high-performance fiber-reinforced concrete (UHPFRC) slabs was investigated. For this investigation, six full-scale UHPFRC slabs with three different thicknesses (h = 40, 60, and 80 mm) were fabricated using two different mixtures. Test results indicated that the combined use of 1% SRA and 7.5% EA is beneficial to improve the mechanical strengths and to reduce the free shrinkage strain of approximately 36-42% at 7 days. Regardless of SRA and EA contents, the slabs with the lowest thickness of 40 mm showed shrinkage cracking at a very early age, while the slabs with higher thicknesses of 60 and 80 mm showed no cracking during testing. However, the UHPFRC slab including 1% SRA and 7.5% EA exhibited a shallow crack with a very small maximum crack width of below 0.04 mm, while the slab without SRA and EA showed through cracks with a large maximum crack width of 0.2 mm.
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