|
Title |
A Study on the Cracking Control Effects of Shrinkage Reduction Concrete
|
|
Authors |
최형길(Hyeong-Gil Choi) ; 김규용(Gyu-Yong Kim) ; 노구치 타카푸미(Takafumi Noguchi) |
|
DOI |
http://dx.doi.org/10.4334/JKCI.2015.27.5.569 |
|
Keywords |
팽창재 ; 팽창수축거동 ; 균열 ; 완전구속실험 ; 구속응력 expansive additive ; expansion-shrinkage ; cracking ; complete restraint test ; restraint stress |
|
Abstract |
The aim of this study is to qualitatively evaluate the cracking control effects of expansive concrete used in reinforced concrete building. The result of experiments in laboratory shows that autogenous shrinkage and drying shrinkage are suppressed by using expansive additive. The tensile stress-strength ratio is lower in expansive concrete than normal concrete under fully restrained condition. Compression stress could be effectively generated in early age in the walls in buildings by the use of expansive additive, and tensile stress due to drying shrinkage at later age eventually decreased. Additionally, visual observation at long-term ages shows that the cracking area of expansive concrete was approximately 35% of normal concrete, which confirms that the use of expansive additive reduces concrete cracking in reinforced concrete buildings.
|