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Title |
A Study on Properties of Retarder via Tabletting Method
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DOI |
https://doi.org/10.4334/JKCI.2013.25.2.201 |
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Keywords |
서중 콘크리트 ; 응결 지연제 ; 정제화 ; 글루코산염 ; 콜드조인트 hot weather concrete ; retarder ; tabletting ; gluconic acid ; cold joint |
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Abstract |
When hot weather concrete is utilized, the cooling methods of cooling pipe, liquid nitrogen, ice, etc., are used to prevent the poor consistency and cold joint due to high temperature. These methods, however, spike the production cost and energy consumption, and make quality control difficult. Among these methods is one that involves the use of a retarder. Although economical, retarder is caused difficulty of retarded hardening and setting time control due to inaccurate weighing and poor working condition. Therefore, how to make a tablet for hot weather concrete, as with the existing pharmacy and foods, is discussed in this study, including the following items: mortar setting time, flow test by elapsed time, physical and mechanical properties of concrete. As a result, gluconic acid is superior to lignosulfonic acid and the possibility of using them for such purpose without quality degradation was confirmed in this study, when retarder is tabletting.
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