|
Title |
Mechanical Properties of Concrete using Alpha-Calcium Sulfate Hemihydrate
|
|
Authors |
신경수(Kyoung-Su Shin) ; 김규용(Gyu-Yong Kim) ; 성길모(Gil-Mo Sung) ; 우상균(Sang-Kyun Woo) ; 임병훈(Byung-Hoon Lim) |
|
DOI |
https://doi.org/10.11112/jksmi.2019.23.7.72 |
|
Keywords |
알파형 반수석고; 콘크리트; 압축강도; 건조수축 Alpha-calcium sulfate hemihydrate; Concrete; Compressive strength; Drying shrinkage |
|
Abstract |
Concrete is vulnerable to cracks due to volume changes caused by temperature changes, shrinkage during curing, external forces, or poor construction. In particular, concrete placed in electric power tunnel structures can generate cracks by a variety of factors. As a result, these tunnel structures require continuous maintenance. In this study, we investigated the mechanical properties of electric power tunnel concrete using alpha-calcium sulfate hemihydrate, which is an industrial byproduct that has excellent expansion performance. To compensate for the decrease in compressive strength when substituting alpha-calcium sulfate hemihydrate, based on previous research, we added 9% alpha-calcium sulfate hemihydrate and adjusted the amount of admixture while using the same amount of cement. We then evaluated the mechanical properties of the concrete. The results showed that the compressive strength of the concrete was higher than that of ordinary Portland cement (OPC), and the shrinkage of concrete was reduced by more than 30% compared to that of OPC. Therefore, adding 9% of alpha-calcium sulfate hemihydrate is expected to have a significant effect in reducing concrete cracks.
|