| 摘要 |
1. Method for manufacturing cast concrete articles of hand-crafted character, characterized in that it consists to prepare a concrete comprised of large calcareous granulate, siliceous sand, Portland cement in a proportion of about 400 kg per m**3 from concrete, a water-reducing additive, and water to have the water/cement ratio =< 0,40 and the consistency of the green concrete lie in class 0 ("dry") as defined in Belgian Standard NBN B 15-205 characterized by a tightening rate (Walz's SC) higher than 1,26, subjecting the mould (1), the green concrete is poured into, up to complete filling of said mould, to vibrations combined with impacts, levelling the concrete casting, scraping the unstable granulate on the casting surface (2) and removing same, hawking and smoothing said surface (2) which comprises the visible surface of the article, stopping the vibrations and impacts imparted to the mould, brush-scoring said surface (2), laying directly on said mould a rigid plate (3) having a plane surface to contact the scored surface, swinging said mould (1) and rigid plate (3) over 180 degrees, unmoulding directly on said plate (3) and letting said article dry on said plate. |
