Carbonation-Induced Corrosion Initiation Probability of Rebars in Concrete With/Without Finishing Materials

Title
Carbonation-Induced Corrosion Initiation Probability of Rebars in Concrete With/Without Finishing Materials
Author
이한승
Keywords
sustainable finishing materials; reinforced concrete structure; probability; carbonation progress
Issue Date
2018-10
Publisher
MDPI AG
Citation
SUSTAINABILITY, v. 10, No. 10, Article no. 3814
Abstract
The carbonation of concrete is the prime deterioration factor in reinforced concrete (RC) structures. During carbonation, the atmospheric CO2 penetrates the concrete and lowers its alkalinity. The problem in predicting carbonation is difficult to address, and a reliable probabilistic carbonation assessment is required to consider different variables such as the concrete quality, the chemistry of the reinforcing steel, and the quality of finishing materials. In the present study, we have used different finishing materials on concrete to minimize the effects of carbonation with a field survey and accelerated conditions. In one experiment, the measurement of the thickness of the concrete cover and the application of the finishing materials were done on-site, whereas, in the other experiment, these were done under accelerated conditions. The carbonation depth and the coefficient of silk wallpaper (SWP) were reduced by half in an accelerated 5% CO2 experiment compared to the plain ordinary Portland cement (OPC), owing to the external physical barrier that reduces the penetration of CO2 through the pores of the concrete. We found that carbonation did not reach the embedded rebar even after 100 years when SWP finishing material was used. The probability model predicted that 51 years would be required for OPC and water paint (WP) to reach a 30% onset of corrosion initiation through accelerated carbonation, while SWP would require 200 years.
URI
https://www.mdpi.com/2071-1050/10/10/3814/htmhttp://repository.hanyang.ac.kr/handle/20.500.11754/81418
ISSN
2071-1050
DOI
10.3390/su10103814
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ARCHITECTURE(건축학부) > Articles
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