ABSTRACT
The construction process can, in certain instances, be sped up by the adoption of precast concrete as a construction material. Precast concrete is that which is cast other than where it is used. The concrete may be cast on site or at works, it may be cast as far away as several thousand kilometres from where it will eventually be used or as near as 300 mm to its eventual position in the structure, as instanced in Table 23.1:
300 mm-3 m:In the case of some special beam or lintel to be introduced to span an opening in existing construction. In this instance the beam element would perhaps be cast, post-tensioned then jacked sideways into its final position in the structure. Tilt-up construction is done by precasting virtually at the eventual position and then rotating elements into position.
