| 摘要 |
PURPOSE:To form the layer of bottom spraying material which is excellent in spraying work, high in sticking strength on the surface of a body and small in shrinkage and to enhance bite of top spraying material by spraying acicular fiber, Portland cement and silica sand, and projecting one part of the acicular fiber on the coated surface and thereafter spraying the top spraying composition. CONSTITUTION:The bottom spraying composition containing 0.1-2wt.% acicular fiber (e.g. vinylon fiber) having 100-2000 denier size and 3-30mm length, 20-40wt.% Portland cement, 40-60wt.% silica sand and polymer dispersion (e.g. acryl-based resin emulsion) for admixing cement in accordance with necessity is sprayed and, after one part of the acicular fiber is projected on the coated surface, top spraying composition is sprayed which contains 40-60wt.% Portland cement and 3-20wt.% ethylene vinyl acetate-calcium carbonate foaming granule material. |
