Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 178, Issue -, Pages 495-506Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.05.167
Keywords
Silane; Fibre pullout; Functionalization; Interface adhesion; UHPFRC
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [99999.000243/2015-09]
- Programa de Pos-graduacao em Engenharia Civil (PPGEC)
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This paper explores the effect of fibre functionalization with tetraethoxysilane (TEOS) in the microstructure and mechanical property of ultra-high performance cement composites with steel fibres. Fibres treated with three concentrations of TEOS were evaluated by pullout tests and SEM/EDS analysis. Mixes with treated fibres showed up to 35.6% increase in bond strength and up to 49.5% reduction in the crack opening at the peak pullout load in comparison with reference mixes containing untreated fibres. The Si/Ca ratios in the fibre-matrix transition zone increases with the increment of the concentration of TEOS in the treatment of the fibre. This indicates an increase of C-S-H at the interface that justifies the enhanced mechanical performance. (C) 2018 Elsevier Ltd. All rights reserved.
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