Abstract
This study investigated synergetic effects of hybrid polypropylene (PP) and steel fibers on explosive spalling prevention of ultra-high performance concrete (UHPC) at elevated temperature. Permeability of UHPC was measured and correlated to the extent of spalling quantitatively. Microstructures of UHPC before and after elevated temperature exposure were examined to reveal potential mechanisms responsible for changes in permeability. Results showed that the use of hybrid PP and steel fibers completely prevented explosive spalling even at low fiber dosage of both fibers due to significant increase of permeability. Microstructural analysis revealed that such synergistic effect on increased permeability of hybrid PP and steel fiber-reinforced UHPC was attributed to enhanced connectivity of empty PP fiber tunnels by multiple microcracks generated from the thermal expansion of both fibers.
| Original language | English |
|---|---|
| Pages (from-to) | 174-181 |
| Number of pages | 8 |
| Journal | Cement and Concrete Composites |
| Volume | 96 |
| DOIs | |
| Publication status | Published - Feb 2019 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2018 Elsevier Ltd
ASJC Scopus Subject Areas
- Building and Construction
- General Materials Science
Keywords
- Elevated temperature
- Explosive spalling
- Permeability
- Ultra-high performance concrete (UHPC)