| 摘要 |
PURPOSE:To raise the durability of the natural ground by spraying a cement mortar prepared by mixing specific weight amounts of a slurried superfine powder and a high performance plasticizer with cement on the surface of the natural ground. CONSTITUTION:A superfine powder of silicon, silica fume, etc., having an average grain size of 1mum or less, is slurried with 30% or more water/superfine powder weight ratios before carried to construction site. The 100pts.wt. cement, 5-50pts.wt. the slurried superfine powder, and 10pts.wt. (at most) a high performance plasticizer composed primarily of a salt of melamine sulfonate-formaldehyde condensate are mixed together with a water-cement ratio of 20-60 to form a cement mortar. A formwork is set on the slope, reinforcing bars are arranged in the formworks, and the cement mortar is sprayed on them. |
