Effect of adding carbon nanotubes on corrosion rates and steel-concrete bond

Hassan, Ahmed, Elkady, Hala and Shaaban, Ibrahim (2019) Effect of adding carbon nanotubes on corrosion rates and steel-concrete bond. Scientific Reports, 9 (1). p. 6285. ISSN 2045-2322

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Abstract

This paper presents a continuation of the evaluation of utilizing Nano Carbon Tubes (CNTs) in reinforced concrete (CNT-CRETE). The compressive, tensile and bond strengths of the samples with and without CNTs were investigated. Scanning Electron Microscope (SME) was utilized to study the microstructure of the prepared samples. In addition, the corrosion resistance of CNT-CRETE, was measured and compared to traditional concrete. Four mixes were prepared, with 0.01%, 0.02%, and 0.03%, CNTs by weight of cement, along with a control mix without CNTs. The results of the experimental work showed that adding CNTs led to an increase in the compressive, tensile and bond strengths of specimens compared to those of the control specimen. SEM examination for control and CNTs specimens showed that CNTs specimen were well structured compared with the control specimen and this affirms that CNTs act as bridges across micro cracks, which explains the improvement in mechanical properties. The diameter of steel bars played a significant role in failure mechanism for pull-out testing and corrosion resistance. In general, adding CNTs to the concrete mix increased the rate of corrosion for steel bars within the low risk limits. Benefits from using CNTs were limited to moderate. Mineral/chemical admixtures or fibers provide better improvements in the mechanical properties of concrete without the problems associated with dispersing CNTs and the health hazard of handling a Nano material.

Item Type: Article
Uncontrolled Keywords: Carbon Nanotubes (CNTs); steel-concrete bond; corrosion rates; pull-out testing
Subjects: Construction and engineering
Depositing User: Kevin Sanders
Date Deposited: 05 Apr 2019 15:11
Last Modified: 03 May 2019 09:52
URI: http://repository.uwl.ac.uk/id/eprint/5911

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