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http://dx.doi.org/10.14190/JRCR.2014.2.4.360

Effect of Types and Replacement Ratio of Alkali Activator on Compressive Strength of Ground Granulated Blast Furnace Slag Mortar  

Kim, Rae-Hwan (Department of Architectural Engineering, Chungnam National University)
Kim, Gyu-Yong (Department of Architectural Engineering, Chungnam National University)
Kim, Jong-Hee (Kyeryong Construction Industrial)
Lee, Bo-Kyeong (Department of Architectural Engineering, Chungnam National University)
Cho, Bong-Suk (Resources Recycling Research Dept. Environment&Energy Research Center, RIST)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.2, no.4, 2014 , pp. 360-366 More about this Journal
Abstract
In this study, effect of types and replacement ratio of alkali activator on compressive strength of ground granulated blast furnace slag mortar has been reviewed. Types of alkali activator are NaOH, $Ca(OH)_2$, $Na_2SO_4$, and KOH. Replacement ratio of alkali activator is 7.5, 10, 12.5, and 15%, respectively. As results, under high temperature curing condition, 1 day compressive strength development with NaOH and KOH was higher than that of $Ca(OH)_2$ and $Na_2SO_4$. Regardless of types of alkali activator, compressive strength increased with increasing pH. This can be explained by the fact that impermeable film on the surface of slag which is generated when slag contacts water has been destroyed by alkali activator, and this promotes hydration reaction. Also, 1 day age compressive strength of specimen with high temperature curing was higher than that of specimen with standard curing. 28 days age compressive strength of specimen with high temperature curing was less than or equal to that of specimen with standard curing.
Keywords
Alkali activator; Replacement ratio; Ground granulated blast furnace slag; Compressive strength;
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Times Cited By KSCI : 1  (Citation Analysis)
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