Casting method

The choice of casting method is normally related to the type of finish required and to the mould table available to the supplier Four alternative casting methods are normally available for factory production

- face-up casting;

- face-down casting;

- double-layered facade elements;

- tilting moulds.

Face-up casting

Face-up casting, although seldom used today, allows various surface finishes to be applied to the top surface while the unit is still in the mould. It is not suitable for tiled finishes or where a smooth surface is required. A disadvantage is that the 'fat' tends to rise to the surface of the concrete, resulting in a weaker face. However; the reinforcement may be easily supported on spacer blocks without detracting from the external appearance.

Casting method 17

t Control tolerances_

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Posh pull props at intervals along length of mould

Posh pull props at intervals along length of mould

1.9 Push-pull props to reduce bowing of timber moulds.

Reinforcement supported Surface treatment on spacer blocks

Coffering built up within the mould

Coffering suspended

(b) Decorative surface treatment in bottom of mould

(b) Decorative surface treatment in bottom of mould

Coffering suspended

Surface can be sandblasted while still in the mould

\Mould tilts for demoukling

Panel cast hofizonUity

1.10 Three alternative methods of casting: (a) face up; (b) face down; (c) tilting moulds.

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