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http://dx.doi.org/10.4334/JKCI.2011.23.3.347

A Study on Setting Time and Early Strength of Tablet-Shaped Accelerators  

Ryou, Jae-Suk (Dept. of Civil and Environmental Engineering, Hanyang University)
Lee, Yong-Soo (Dept. of Civil and Environmental Engineering, Hanyang University)
Publication Information
Journal of the Korea Concrete Institute / v.23, no.3, 2011 , pp. 347-352 More about this Journal
Abstract
When concrete is worked in cold weather, the methods of using hot air, water and aggregate heating, accelerators are used to prevent early frosting and to improve early strength. But these methods raise problems such as implementation difficulty, high cost, and energy losses. Among the available cold weathering methods, accelerator method is the most economical but with the drawbacks of rapid setting and insufficient workability in the initial hydration stage. Therefore, the tablet method usually used for pharmaceutical field was applied to the accelerator method to compare the controlled reaction time of the new and old accelerator method. Based on the test results, physical and mechanical properties of concrete were tested and the possibility of delaying initial reactions to increase the total reaction time was evaluated. The results showed that when both accelerators and tablet were used, setting-time decreased. Physical properties of concrete were optimal for tablet 0.5% and 1.0%. Also, accelerator 0.5%, tablet 0.5% and 1.0% showed good early strengths.
Keywords
cold weather concrete; accelerator; tablet; setting time; early strength;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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