STUDY ON THE EXECUTION PROPERTIES OF HIGH QUALITY SHOTCRETE

Abstract

Iwate Tunnel of Tohoku Shinkansen line is a long length tunnel of 25, 810 meters. As usual, it contains such problems as construction environment and cost performance on shotcreting in a tunneling work. In this project, we tried improve mix proportion, mixing method and execution procedure of high quality shotcrete using limestone, silica fume and superplasticizer, for the purpose of improvement on constructability and decrease on the rebound and dust of shotcrete. This report discribes the execution properties of high quality shotcrete obtained from the above experience.