Substitutive effect of nano-SiO2 for silica fume in ultra-high-performance concrete on fiber pull-out behavioropen access
- Authors
- Oh, Taekgeun; Chun, Booki; Lee, Seung Kyun; Lee, Wonkyo; Banthia, Nemkumar; Yoo, Doo-Yeol
- Issue Date
- Sep-2022
- Publisher
- ELSEVIER
- Keywords
- Ultra-high-performance concrete; Nano-SiO2; Compressive strength; Autogenous shrinkage behavior; Single fiber pullout behavior
- Citation
- JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v.20, pp.1993 - 2007
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
- Volume
- 20
- Start Page
- 1993
- End Page
- 2007
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/185806
- DOI
- 10.1016/j.jmrt.2022.08.013
- ISSN
- 2238-7854
- Abstract
- This study investigated the effect of substituting nano-SiO2 for silica fume on the fibermatrix interfacial bond performance of ultra-high-performance concrete (UHPC). In this study, silica fume was substituted by nano-SiO2 in the weight range of 0-50%. The degree of pozzolanic reaction of binder materials was evaluated using the thermogravimetric analysis (TGA) and compressive strength measurement. The single fiber pull-out test was conducted along with a measurement of autogenous shrinkage to evaluate the interfacial bond. The degree of pozzolanic reaction of nano-SiO2 was found to be higher than that of other binder materials. Although the packing density was predicted to increase continuously up to a substitution ratio of 50%, the highest compressive strength was obtained when 10% of silica fume was replaced by nano-SiO2 which improved the compressive strength by 5.9% compared to that of the plain sample. The autogenous shrinkage increased with an increasing content of nano-SiO2 up to 30%; however, it remained similar beyond the nanoSiO(2) content of 30%. The best pull-out performance was obtained when 20% of silica fume was replaced by nano-SiO2, in which the average bond strength and pull-out energy were improved by approximately 21 and 68%, respectively. Therefore, substitution of 10-20% of silica fume by nano-SiO2 was recommended as an optimal amount considering the improvements of the compressive strength and fiber-matrix bond performance of UHPC.
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