| Title |
Effect of Expanding Admixture and Shrinkage Reducing Agent on Basic Properties and Shrinkage Reducing Properties of Ultra High Performance Cement Mortar |
| Authors |
Lee Hyun-Soo ; Han Dong-Yeop ; Han Cheon-Goo ; Park Moon-Seo |
| Keywords |
Ultra High Performance Concrete ; Autogenous Shrinkage ; Expanding Admixture ; Shrinkage Reducing Agent |
| Abstract |
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. |