|
Title |
Evaluation of Dynamic Tensile Strength of HPFRCC According to Compressive Strength Level
|
|
Authors |
박기준(Gi-Joon Park) ; 김원우(Won-Woo Kim) ; 박정준(Jung-Jun Park) ; 문재흠(Jae-Heum Moon) ; 김성욱(Sung-Wook Kim) |
|
DOI |
https://doi.org/10.11112/jksmi.2018.22.3.031 |
|
Keywords |
동적충격 인장강도 ; 동적증가계수 ; 강섬유 ; 고성능 섬유보강 시멘트 복합체 ; 압축강도 Dynamic tensile strength ; Dynamic impact factor ; Steel fiber ; HPFRCC ; Compressive strength |
|
Abstract |
This study evaluates the dynamic tensile behavior of HPFRCC according to compressive strength levels of 100, 140 and 180 MPa. Firstly, the compressive stress-strain relationship of 100, 140 and 180 MPa class HPFRCC was analyzed. As a result, the compressive strengths were 112, 150 and 202 MPa, respectively, and the elastic modulus increased with increasing compressive strength. The static tensile strengths of HPFRCC of 100, 140 and 180 MPa were 10.7, 11.5 and 16.5 MPa, and tensile strength also increased with increasing compressive strength. On the other hand, static tensile strength and energy absorption capacity at 100 and 140 MPa class HPFRCC showed no significant difference according to the compressive strength level. It was influenced by the specification of specimen and the arrangement of steel fiber. As a result of evaluating the dynamic impact tensile strength of HPFRCC, tensile strength and dynamic impact factor of all HPFRCCs tended to increase with increasing strain rate from 10-1/s to 150/s. In the same strain rate range, the DIF of the tensile strength was measured higher as the compressive strength of HPFRCC was lower. It is considered that HPFRCC of 100 MPa is the best in terms of efficiency. Therefore, it is advantageous to use HPFRCC with high compressive strength when a high level of tensile performance is required, and it is preferable to use HPFRCC close to the target compressive strength for more efficient approach at a high strain rate such as explosion.
|