Browse > Article
http://dx.doi.org/10.5322/JES.2006.15.2.185

A Study on the Determination of the Removal Times of Form in Concrete Using Fly Ash Cement  

Shin Byung-Cheol (Department of Landscape Architecture, Joongbu University)
Han Min-Cehol (Industrial Science Research Institute, Chongju University)
Publication Information
Journal of Environmental Science International / v.15, no.2, 2006 , pp. 185-191 More about this Journal
Abstract
In this paper, removal time of side form from concrete using OPC(ordinary Portland cement) and FAC(fly ash cement) are proposed by appling logistic model, which evaluates the strength development of concrete with maturity. W/B, types of cement and curing temperatures are adapted as test parameters. The estimation of strength development by logistic model has a good agreement between calculated values and measured ones. As for the removal times of form works suggested in this paper, as W/8 increases, curing temperature decreases and fly ash is used, removal time of side form is prolonged. Removal time of form from concrete using OPC suggested in this paper is shorter $2.5\~3.5$ days than those of KASS-5 (Korean Architectural Standard Specifications-5) in the range of over $20^{\circ}C$. And in the range of $10\~20^{\circ}C$ removal time of form is shorter than that of KASS-5 by as much as $4\~4.5$ days. The use of FAC results in an increase in removal time of form compared to that of OPC by about 1 day.
Keywords
Fly ash; Removal times of form; Strength development; Maturity; Concrete;
Citations & Related Records
연도 인용수 순위
  • Reference
1 한국콘크리트학회, 2003, 콘크리트 표준시방서, 124-126
2 Carino, N. J., 1984, Maturity method; theory and application, Journal of Cement Concrete and Aggregate, ASTM., 1-15
3 Saul, A. G. A., 1951, Principles underlying the steam curing of concrete at atmospheric pres sure, Magazine of Concrete Research, 2(6), 127-140   DOI
4 鎌田英治, 1986, ロジステック曲線を應用したコンクリ - ト強度推定法の提案, 日本建築學會論文 報告集, 367, 1-8
5 한천구, 한민철, 2004, 고강도콘크리트 시공시 측면 거푸집 탈형시기의 결정, 한국콘크리트학회 논문집, 16(3), 327-334
6 대한건축학회, 2003, 건축공사 표준시방서, 239-­241