Wet-mix Shotcreting Application of High Ductile Fiber Reinforced Mortar Designed by Optimizing Mix Proportion

  • Kim Yun Yong (Department of Civil and Environmental Engineering, KAIST) ;
  • Kim Jeong Su (Department of Civil and Environmental Engineering, KAIST) ;
  • Kim Jin Keun (Department of Civil and Environmental Engineering, KAIST) ;
  • Ha Gee Joo (Department of Architectural Engineering, Kyungil University)
  • Published : 2004.11.01

Abstract

High ductile fiber reinforced mortar suitable for wet-mix shotcreting (sprayable ductile mortar) 10 the fresh state, while maintaining tensile strain-hardening behavior in the hardened state, has been developed based on micromechanics and workability control. In the development concept of sprayable ductile mortar, micromechanics is adopted to properly select the matrix, fiber, and interface properties to exhibit strain hardening and multiple cracking behaviors in the composites. Within the pre-determined micromechanical constraints, the workability is controlled by optimizing mix proportions. A series of spray tests show the excellent pumpability and sprayability of the sprayable ductile mortar. Subsequent direct tensile tests demonstrate that the tensile performance of sprayed mortar is comparable to that of cast mortar, for the same mix design.

Keywords