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

被引:16
|
作者
Lee, Hyung-Min [1 ,2 ]
Lee, Han-Seung [1 ]
Min, Sang-ho [1 ]
Lim, Seungmin [1 ]
Singh, Jitendra Kumar [1 ]
机构
[1] Hanyang Univ, Dept Architectural Engn, 1271 Sa 3 Dong, Ansan 15588, South Korea
[2] Univ Miami, Civil Architectural & Environm Engn, Coral Gables, FL 33146 USA
基金
新加坡国家研究基金会;
关键词
sustainable finishing materials; reinforced concrete structure; probability; carbonation progress; FRACTURE-TOUGHNESS; GREEN CONCRETE; FLY-ASH; DURABILITY;
D O I
10.3390/su10103814
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
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页数:15
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