팽창재 및 수축저감제가 초고성능 시멘트 모르타르의 수축특성에 미치는 영향

The toughness increased concrete produced by mixing steel fibers, is called Ultra High Performance Concrete (UHPC). This type of concrete, yet, is concerned about autogenous shrinkage in addition to drying shrinkage from low water-binder ratio. In this study, therefore, it is tested if the steel fiber can reduce the shrinkage of UHPC. Additionally, a test to reduce the shrinkage of UHPC using Expanding Admixture (EA) and Shrinkage Reducing Agent (SRA) is conducted. As a result, it is found that EA and SRA can reduce the shrinkage while the steel fibers lead increase of shrinkage. For EA, however, the shrinkage is increased at the initial age. Consequently, through this study, it is recommended to mix both 5% of EA and 1% of SRA for UHP mixed with 2% of steel fibers. This case will reduce drying shrinkage to 59% and autogenous shrinkage to 79% compared to the case not mixing the EA and the SRA.