| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a spraying method where the compressive strength of a mortar hardened body on curing on site is≥150 N/mm<SP>2</SP>, bending strength is≥20 N/mm<SP>2</SP>, and a bending strength/compressive strength ratio is≥1/9. <P>SOLUTION: In the spraying method, ultra-high strength fiber-reinforced mortar obtained by kneading: a binder composed of cement, silica fume, coal gasification fly ash and gypsum each in a specified blending ratio; fine aggregate of 50 to 200 pts.mass to 100 pts.mass of the binder; fibers with a length of 5 to 30 mm in a 0.5 to 3 vol.% to 1 m<SP>3</SP>of mortar composed of the binder, the fine aggregate and water; and water, is fed under pressure by a pump, and is sprayed using compressed air so as to obtain a mortar hardened body. In the mortar hardened body, the compressive strength is≥150 N/mm<SP>2</SP>, the bending strength is≥20 N/mm<SP>2</SP>, and the bending strength/compressive strength ratio is≥1/9. There is also provided an ultra-high strength fiber-reinforced mortar hardened body. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
