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http://dx.doi.org/10.4334/JKCI.2008.20.3.405

Mechanical Properties of Alkali-Activated Slag-Based Concrete Using Lightweight Aggregates  

Yang, Keun-Hyeok (Dept. of Architectural Engineering, Mokpo University)
Oh, Seung-Jin (Dept. of Architectural Engineering, Mokpo University)
Song, Jin-Gyu (Dept. of Architecture, Chonnam University)
Publication Information
Journal of the Korea Concrete Institute / v.20, no.3, 2008 , pp. 405-412 More about this Journal
Abstract
Six alkali-activated (AA) concrete mixes were tested to explore the significance and limitations of developing an environmental friendly concrete. Ground granulated blast-furnace slag and powder typed sodium silicate were selected as source material and an alkaline activator, respectively. The main parameter investigated was the replacement level of lightweight fine aggregate to the natural sand. Workability and mechanical properties of lightweight AA concrete were measured: the variation of slump with time, the rate of compressive strength development, the splitting tensile strength, the moduli of rupture and elasticity, the stress-strain relationship, the bond resistance and shrinkage strain. Test results showed that the compressive strength of lightweight AA concrete sharply decreased when the replacement level of lightweight fine aggregate exceeded 30%. In particular, the increase in the discontinuous grading of lightweight aggregate resulted in the deterioration of the mechanical properties of concrete tested. The measured properties of lightweight AA concrete were also compared, wherever possible, with the results obtained from the design equations specified in ACI 318-05 or EC 2, depending on the relevance, and the results predicted from the empirical equations proposed by Slate et al. for lightweight ordinary Portland cement concrete. The stress-strain curves of different concrete were compared with predictions obtained from the mathematical model proposed by Tasnimi. The measured mechanical properties of lightweight AA concrete generally showed little agreement with the predictions obtained from these equations.
Keywords
alkali-activated concrete; lightweight aggregate; slag; mechanical properties;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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