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건조수축 저감형 유동화제를 사용한 콘크리트의 Mock-up 실험
신재경(Shin Jae-Kyung),오치현(Oh Chi-Hyun),최진만(Choi Jin-Man),이성연(Lee Seong-Yeun),한민철(Han Min-Cheol),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.9 No.2
This paper reports the results of Mock-up test for concrete using drying shrinkage reducing superplasticizer(DSRS) in order to evaluate the validity of DSRS. The use of DSRS results in an noticeable improvement in compressive strength compared with other concrete. Drying shrinkage of concrete using DSRS is lower than of conventional concrete by as much as 17% due to less water content and contribution of expansive additives to expansion of specimens. Drying shrinkage measured by contact gauge has the highest value at the thin section of the mock up member such as near the window. The use of DSRS can reduce drying shrinkage by as much as 15~30% comapared with conventional concrete member.
신재경 ( Jae-kyung Shin ),오치현 ( Chi-hyun Oh ),최진만 ( Jin-man Choi ),이성연 ( Seong-yeun Lee ),한민철 ( Min-cheol Han ),한천구 ( Cheon-go Han ) 한국건축시공학회 2006 한국건축시공학회 학술발표대회 논문집 Vol.6 No.2
This study investigates filed application in Daebul Free Trade Zone of a flowing method using drying shrinkage-reducing super plasticizer(SRS) and an insulating curing method using double bubble sheets. Test showed that fresh concrete satisfied target slum pandaircontent. A structure adding SRS significantly decreased the total bleeding capacity and accelerated the setting time. As for the crack occurrence, the structure applying the flowing method and double bubble sheets simultaneously exhibited the most favorable crack endurance, while conventional concrete showed more than 1mm size of crack in overall, and a structure applying only the flowing method partially presented micro crack. For the are a proportion of crack occurrence, the structure using the double bubble sheets indicated 9.8%, while others applying flowing method was 28%, compared with 100% of conventional one. Standard curing specimens had about 3~6% higher compressive strength than that of specimens cured at adjacent field construction. In addition, using SRS improved about 5~7MPa, than that of conventional concrete at 91 days elapse.