Hanson Precast Concrete
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Product Info - Off-Form Finishes A variety of finishes may be produced directly off the mould. Such finishes fall into two broad categories 1. Plain, flat and smooth surfaces, 2. profiled, grooved and sculptured surfaces.
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Plain, flat and smooth surfaces are amongst the most difficult to
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produce because of the problems they present with colour control and
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rectification of accidental soiling and damage. In practice they are best suited to receive a paint or other applied finish, in which case they become a very economical panel. It is recommended that wherever possible, off-form surfaces should be modulated by profiling, grooving or sculpturing. Such techniques improve appearance by developing a pattern of light and shade on the surface. This, in turn, will minimise any minor discolouration problems
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and provide improved in-service weathering.
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There are many techniques for providing patterns or other effects with off-form finishes.
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Hanson Precast Concrete
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Australian Precast Concrete home
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Walling Loadbearing Facades Cladding Hollowcore Wall Panels Energy-efficient Facades
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Product Application - Off-Form Finishes Smooth off-form finishes are best employed where they are to receive paint or other applied finish. A good example of this is the office section of MEA at Seven hills. Simple modulation of off-form surfaces, such as ribbing, improves the
MEA front office, Seven Hills, which
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appearance and weathering of units. This was used effectively in the
uses smooth off-form finish, which is
Slough Industrial Estate at Silverwater. Here the ribbed finish was
subsequently painted to produce an
Design Data
enhanced by the use of off-white cement, while weathering was
economical unit
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improved with curved bases to the panels.
Off-Form Finishes
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Ribbed off-form panels using off-white cement provide a pleasing appearance and good weathering at Slough Estate, Silverwater
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Hanson Precast Concrete
http://www.hansonpc.biz/products/offform-design.shtml
Australian Precast Concrete home
about us
Walling
products
services & solutions
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Design Data - Off-Form Finishes
Loadbearing Facades Cladding Hollowcore Wall Panels Energy-efficient Facades Off-Form Finishes Product Application Design Data Other Data Applied Finishes Exposed-aggregate Finishes Multiple Finishes Flooring
Architectural unpainted off-form finishes are just about the most difficult to manufacture and may be more expensive than sandblasted or other architectural finishes. This difficulty comes more from our customer's expectations than from the technical difficulties in complying with AS 3610-1995. The basis for off-form surface finish documentation is often Australian Standard AS 3610-1995 Formwork for Concrete supported by AS 3610 Supplement 1 Blowhole and Colour Evaluation Charts and AS 3610 Supplement 2-1996 Formwork for Concrete, Commentary. These documents are frequently tempered by the use of various sample panels which are agreed upon between Hanson and our customers and their consultants. In any event Class 2 is the normal best standard that should be specified. Class 3 is adequate for many uses. AS 3610 is a quality guidance document but no document could possibly eliminate the subjective component of surface finishes and colour control. Specifiers should read the Commentary (AS 3610 Supplement 2) to appreciate the concerns of the document's drafting committee.
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In particular it should be noted that Class 1 finish should never be specified except for use "in very special
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only to colour control within one panel - not from panel to panel.
features of buildings of a monumental nature." In particular AS 3610 points out that Class 1 finishes relate
What the codes cannot cover are all the exceptions. Different panels shapes and orientations when poured have a great influence over both the colour and number of blowholes in the finished product. Prior to the introduction of AS 3610, the industry relied heavily upon the use of sample panels as the means of negotiating a contract and controlling production. This approach is still widely used by architects and precast manufacturers. Specifiers may have a requirement for, say, a Class 2 finish and still introduce the use of sample panels. In the great majority of projects finish selection is a straightforward process where an initial selection is made from a 300 x 300 sample and then a larger scale unit is used to illustrate how this finish may vary on production panels, with various shapes and orientations of finished surfaces. The great majority of problems come from unrealistic client expectations. It is really important to understand just what is possible with precast concrete, to set realistic criteria and then to monitor against that criteria.
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