| Title |
Experimental Study on Reduced Amount of Rebound in Wet Process Shotcrete Works by Upon Accelerator Contents |
| Authors |
전준태(Jeon, Jun Tai) ; 박홍태(Park, Hong Tae) ; 이양규(Lee, Yang Kyu) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.6D.615 |
| Keywords |
급결제;습식 숏크리트;반발률;배합비;타설시간 accelerator;wet process shotcrete;rebound rate;mix proportion rate;shooting time |
| Abstract |
The aim of shotcrete is to increase the bearing capacity and to protect the excavated surface from erosion by preventing falling of rock mass. Shotcreting method is divided into two types as dry process and wet process. Since 1997, wet process method has been used more frequently than dry process method in field works. The failure to bond, so called rebound, occurs in many case during shotcrete works. The excess amount of rebound has a significant effect on the total construction cost. For example, material and craft-man cost increases, the shooting time delays due to deceleration of work execution stage, work efficiency of craft-man decreases and additional cost to remove the muck generates. In this study, therefore, the experimental analysis of rebound amount and strength was conducted by analyzing the actual construction data for wet process type of shotcreting method upon accelerator contents. Also, the effective and rational method was suggested, which can be actually implemented in the Korea construction sites. |