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http://dx.doi.org/10.5345/JKIBC.2016.16.4.321

An Experimental Study on the Chloride Attack Resistibility of Alkali-Activated Ternary Blended Cement Concrete  

Yang, Wan-Hee (R&D CENTER, Intchem Co., Ltd.)
Hwang, Ji-Soon (R&D CENTER, Intchem Co., Ltd.)
Jeon, Chan-Soo (Advanced Building Research Division, Korea Institute of Construction Technology)
Lee, Sea-Hyun (Advanced Building Research Division, Korea Institute of Construction Technology)
Publication Information
Journal of the Korea Institute of Building Construction / v.16, no.4, 2016 , pp. 321-329 More about this Journal
Abstract
The use of ternary blended cement consisting of Portland cement, granulated blast-furnace slag (GGBFS) and fly ash has been on the rise to improve marine concrete structure's resistance to chloride attack. Therefore, this study attempted to investigate changes in chloride attack resistibility of concrete through NT Build 492-based chloride migration experiments and test of concrete's ability to resist chloride ion penetration under ASTM C 1202(KS F 2271) when 1.5-2.0% of alkali-sulfate activator (modified alkali sulfate type) was added to the ternary blended cement mixtures (40% ordinary Portland cement + 40% GGBFS + 20% fly ash). Then, the results found the followings: Even though the slump for the plain concrete slightly declined depending on the use of the alkali-sulfate activator, compressive strength from day 2 to day 7 improved by 17-42%. In addition, the coefficient from non-steady-state migration experiments for the plain concrete measured at day 28 decreased by 36-56% depending on the use of alkali-sulfate. Furthermore, total charge passed according to the test for electrical indication of concrete's ability to resist chloride ion penetration decreased by 33-62% at day 7 and by 31-48% at day 28. As confirmed in previous studies, reactivity in the GGBFS and fly ash improved because of alkali activation. As a result, concrete strength increased due to reduced total porosity.
Keywords
ground granulated blast-furnace slag(GGBS); fly ash; blended cement; alkali activated cement; chloride attack resistibility; ability to resist chloride ion penetration; chloride migration coefficient;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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