| 摘要 |
<p>PURPOSE: To produce a high-performance sprayable concrete used in coating the wall face of the natural ground and tunnel. CONSTITUTION: This sprayable concrete consists of cement, an accelerator, a fine aggregate and a coarse aggregate, and 100 pts.wt. of the fine aggregate contains 3-20 pts.wt. of >=1 kind of inorg. powder selected from among calcium carbonate, fly ash, chamotte and blast-furnace water granulated slag, and the slump value of the sprayable concrete is controlled to 10-20cm.</p> |
