Substitutive effect of nano-SiO2for silica fume in ultra-high-performance concrete on fiber pull-out behavior

Taekgeun Oh, Booki Chun, Seung Kyun Lee, Wonkyo Lee, Nemkumar Banthia, Doo Yeol Yoo

Research output: Contribution to journalArticlepeer-review


This study investigated the effect of substituting nano-SiO2 for silica fume on the fiber-matrix 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 nano-SiO2 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.

Original languageEnglish
Pages (from-to)1993-2007
Number of pages15
JournalJournal of Materials Research and Technology
Publication statusPublished - 2022 Sept

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea ( NRF ) grant funded by the Korea government ( MSIT ) (No. 2021R1A2C4001503).

Publisher Copyright:
© 2022 The Author(s).

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Biomaterials
  • Surfaces, Coatings and Films
  • Metals and Alloys


Dive into the research topics of 'Substitutive effect of nano-SiO2for silica fume in ultra-high-performance concrete on fiber pull-out behavior'. Together they form a unique fingerprint.

Cite this