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http://dx.doi.org/10.5345/JKIBC.2012.12.3.275

Corrosion-Inhibition and Durability of Polymer-Modified Mortars Using Redispersible Polymer Powder with Nitrite-Type Hydrocalumite  

Kim, Wan-Ki (Department of Architectural Engineering, Hyupsung University)
Hong, Sun-Hee (Graduate School, Hyupsung University)
Publication Information
Journal of the Korea Institute of Building Construction / v.12, no.3, 2012 , pp. 275-283 More about this Journal
Abstract
Nitrite-type hydrocalumite (calumite) is a material that can adsorb the chloride ions ($Cl^-$)that cause the corrosion of reinforcing bars and liberate the nitrite ions ($NO_2{^-}$) that inhibit corrosion in reinforced concrete, and can provide a self-corrosion inhibition function to the reinforced concrete. In this study, VA/E/MMA-modified mortars with calumite were prepared with various calumite contents and polymer binder-ratios, and tested for corrosion inhibition, chloride ion penetration, carbonation and drying shrinkage. As a result, regardless of polymer-binder ratio, the replacement of ordinary Portland cement with hydrocalumite has a marked effect on the corrosion inhibiting property of the polymer-modified mortars. However, chloride ion penetration and carbonation depths are somewhat increased with higher calumite content, but can be remarkably decreased depending on the polymer-binder ratios. The 28-d drying shrinkage shows a tendency to increase with the polymer-binder ratio and calumite content. VA/E/MMA-Modified mortars with 10 % calumite did not satisfy KS requirements. Accordingly, a calumite content of 5 % is recommended for the VA/E/MMA-modified mortars with calumite.
Keywords
redispersible polymer powder; hydrocalumite; corrosion-inhibition; durability;
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