| Title |
A Study on the Strength Characteristics and Rebound Ratio with Respect to Injection Pressure of Shotcrete |
| Authors |
전준태(Jeon, Jun Tai) ; 문인기(Moon, In Gi) ; 이양규(Lee, Yang Kyu) |
| DOI |
https://doi.org/10.12652/Ksce.2019.39.1.0115 |
| Keywords |
강섬유 습식Shotcrete;리바운드율;역학적 거동;분사압력 Steel fiber reinforced wet-type shotcrete;Rebound rate;Structural behaviour;Injection pressure |
| Abstract |
Steel Fiber Reinforced Wet-type Shotcrete improves the quality and stabilizes the tunnel by increasing the shear strength of the natural ground by constructing the concrete which attaches the fresh concrete to the predetermined position from the nozzle. The Steel Fiber Reinforced Wet-type Shotcrete improves and reinforces the strength and dynamic behavior characteristics of concrete to suppress the generation and growth of local cracks by increasing the tensile resistance ability. In addition, Steel Fiber Reinforced Wet-type Shotcrete is a shotcrete that improves tensile strength, bending strength, and crack resistance by dispersing discontinuous short steel fibers evenly in concrete. In this study, compressive strength test and bending strength test of shotcrete of NATM tunnel were measured and rebound reduction rate was measured by varying shotcrete putting pressure to 900 RPM, 1,000 RPM, and 1,100 RPM. Therefore, the data that can be applied to domestic NATM tunnel construction are presented. |