Precast concrete, with compositions based on stone aggregate mixes, is manufactured with a great variety of colours, textures and finishes to facilitate its use in cladding applications. Modern compositions are very strong and virtually impervious. Surface finishes are generally created after de-moulding. Wet finishing techniques used include acid etching, and retarding, in which curing of the surface is retarded, enabling it to be removed by brushing or high pressure washing. Dry techniques include grit blasting, tooling ( needle guns, hammers, etc ) and polishing.
Primary author(s): Dawson S
Source: Archit.J.(Concrete Quarterly)
Vol.219, No.9, 2004, p.10-11