한중환경에서 기둥부재 크기 및 거푸집 종류변화에 따른 콘크리트의 온도이력 및 강도발현 특성 = Temperature History and Strength Development of Concrete Depending on Column Size and Form Type Subjected to Cold Weather

다국어 초록 (Multilingual Abstract)

The objective of the paper is to discuss an effective surface insulation curing method of column concrete when placed under cold weather condition in response to varying their column sizes and form types. In this test, the temperature profiles and strength development of the specimens are examined. According to the test results, it was clear that the temperature of specimens tended to decrease to below 0℃ more quickly as the section size of specimens was smaller, thus the specimen bigger than the size of 200×200mm maintained the temperature above 0℃ considerably, which can protect concrete from frost damage at early age. This is due to the heat keeping capacity of larger specimens, although there was no insulation curing methods prepared. In addition, using the metal and plywood form on the specimens sharply dropped the temperature to the below 0℃ before 24 hours as soon as they moved into the cold condition of a curing chamber. However the use of the bubble board and insulating form on the specimens did not result in a temperature drop of concrete below 0℃ at any part of specimens, and after around 36~48 hours, temperature of concrete was even back to rise again by their increased hydration heat. Importantly, the maturity of concrete using the bubble board and insulation form indicated more than 50°DD, which satisfied minimum maturity, 40°DD, for protection from the frost damage, proposed by Koh. Moreover, the compressive strength of concrete using the bubble board and insulating form had the largest values, compared to those of other types of forms.

참고문헌 (Reference)

1 한천구, "한중콘크리트의 초기동해방지를 위한 초기양생기간의 산정" 12 (12): 47-55, 2000

2 김경민, "한중콘크리트용 단열거푸집의 개발에 관한 연구" 21 (21): 2001

3 한천구, "적산온도방식의 콘크리트 강도증진 해석에 의한 기온보정강도의 검토" 15 (15): 1999

4 한민철, "적산온도방식에 의한 콘크리트의 강도증진해석에 관한 연구" 청주대학교 대학원 1997

5 고경택, "단열재 거푸집을 이용한 콘크리트의 특성에 관한 기초적 연구" 4 (4): 2000

6 김경민, "내한제 및 단열거푸집에 의한 한중콘크리트 시공의 효율화에 관한 기초적 연구(슬래브를 중심으로)" 14 (14): 2001

7 김경민, "내한제 및 단열거푸집에 의한 한중콘크리트 시공의 효율화에 관한 기초적 연구" 13 (13): 2001

8 한민철, "기온과 콘크리트" 기문당 2002

9 日本建築學會, "建築工事標準示方書․同解說(JASS-5,鐵筋コンクリ-ト工事)"

10 日本建築學會, "寒中コンクリ-ト施工指針․同解說"

11 韓國建設技術硏究院, "寒中 및 暑中콘크리트에 관한 硏究" 1998

12 洪悅郞, "初期凍害に對するAEコンクリートなどの效果" (12) : 1958