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Title |
Corrosion-Inhibition and Durability of Polymer-Modified Mortars Using Bisphenol A and F Type Epoxy Resin with Calumite
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DOI |
https://doi.org/10.4334/JKCI.2014.26.4.517 |
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Keywords |
에폭시수지 ; 하이드로칼루마이트 ; 폴리머 시멘트 모르타르 ; 내구성 ; 방청성 ; epoxy resin ; hydrocalumite ; polymer-modified mortars (PMM) ; corrosion-inhibition ; durability |
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Abstract |
Nitrite-Type hydrocalumite (calumite) is a material that can adsorb chloride ions (Cl-) that cause corrosion of reinforce bars and liberate the nitrite ions (NO2 -) that inhibit corrosion in reinforced concrete. In this study, polymer-modified mortars using two types of epoxy resin with calumite are prepared with various polymer binder-ratios of 0, 5, 10, 15, 20% and calumite contents of 0, 5%. The specimens are tested for chloride ion penetration, carbonation, drying shrinkage and corrosion inhibition. As a result, the chloride ion penetration and carbonation depth of PMM using epoxy resin somewhat increases with increasing calumite contents, but those remarkably decreases depending on the polymer-binder ratios. The 28-d drying shrinkage shows a tendency to decrease with increasing polymer-binder ratio and calumite content. Unmodified mortars with calumite content of 5% did not satisfy quality requirement by KS. However, it was satisfied with KS requirement by the modification of epoxy resin in cement mortar. On the whole, the carbonation and chloride ion penetration depth of epoxy-modified mortars with calumite is considerably improved with an increase in the polymer-binder ratio regardless of the calumite content, and is remarkably improved over unmodified mortar. And, the replacement of the portland cement with the calumite has a marked effect in the corrosion-inhibiting property of the epoxy-modified mortars.
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