| abstract |
[PROBLEMS] The same inorganic material as a concrete skeleton, can maintain the integrity with the skeleton, and can be constructed by spraying, so as to save labor of the construction, and cracks generated or generated in the concrete skeleton with a large opening width. Without cracking, cracks can be suppressed, and entry of harmful substances can be prevented. A crack-dispersed short-fiber reinforced cement composite material having a roughening treatment on a surface of a skeleton concrete, and further having a tensile strain of 1% or more in a tensile test of a hardened body on the age of 28 days. Wherein PVA short fibers satisfying a predetermined condition are added to a predetermined preparation matrix by more than 1 vol. %, A high toughness fiber reinforced cement composite material (high toughness FRC material) mixed randomly or three-dimensionally is applied by spraying. [Selection diagram] Fig. 1 |