Please use this identifier to cite or link to this item: https://scholarhub.balamand.edu.lb/handle/uob/5799
Title: EFFECT OF PIGMENTS ON BOND STRENGTH BETWEEN COLOURED CONCRETE AND STEEL REINFORCEMENT
Authors: Assaad, Joseph 
Matta, Matthew
Saade, Jad
Affiliations: Faculty of Engineering 
Keywords: Bond strength
Carbon black
Coloured concrete
Durability
Iron oxide pigment
Titanium dioxide
Issue Date: 2022-01-05
Part of: Acta Polytechnica
Volume: 62
Issue: 2
Start page: 248
End page: 261
Abstract: 
The effect of pigments on mechanical properties of coloured concrete intended for structural applications, including the bond stress-slip behaviour to embedded steel bars, is not well understood. Series of concrete mixtures containing different types and concentrations of iron oxide (red and grey colour), carbon black, and titanium dioxide (TiO2) pigments are investigated in this study. Regardless of the colour, mixtures incorporating increased pigment additions exhibited higher compressive and splitting tensile strengths. This was attributed to the micro-filler effect that enhances the packing density of the cementitious matrix and leads to a denser microstructure. Also, the bond to steel bars increased with the pigment additions, revealing their beneficial role for improving the development of bond stresses in reinforced concrete members. The highest increase in bond strength was recorded for mixtures containing TiO2, which was ascribed to formation of nucleus sites that promote hydration reactions and strengthen the interfacial concrete-steel transition zone. The experimental data were compared to design bond strengths proposed by ACI 318-19, European Code EC2, and CEB-FIP Model Code.
URI: https://scholarhub.balamand.edu.lb/handle/uob/5799
ISSN: 12102709
DOI: 10.14311/AP.2022.62.0248
Open URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Civil and Environmental Engineering

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