06/1168 - Change a Development Approval [As Published] · 132006.1168.02

shall be thoroughly wetted. When concreting is scheduled in exposed, hot locations, such wetting shall
continue until the temperature of reinforcement and forms is not higher than 32°C.

No concrete shall be placed until the positioning and fastening of the reinforcement, forms and supports,
or the foundation as the case may be, have been inspected and approved by the Superintendent.

Any flow of water into an excavation shall be diverted through proper side drains to a sump, or be
removed by other approved methods that will avoid washing the freshly deposited concrete. If directed
by the Superintendent, water vent pipes and drains shall be filled by grouting or otherwise after the
concrete has thoroughly hardened.

Concrete shall be handled from the mixer to the place of final deposit as rapidly as practicable by
methods that prevent the separation or loss of ingredients. Mixing and transporting equipment shall be
free from hardened concrete and foreign materials on the inner surface. The concrete shall be deposited
in the form as near as practicable in its final position to avoid rehandling. It shall be so deposited as to
maintain, until the completion of the unit, a surface approximately horizontal. The depositing of large
quantities of concrete at any one point and running or working it along the forms will not be allowed.

Concrete shall be gently placed in position and shall not be poured from a height greater than 1.2 m into
the forms unless suitable chutes approved by the Superintendent are provided. Such chutes shall be of
metal, or metal-lined, and the angle and shape of the chutes shall allow the concrete to flow without
separation of the ingredients. Chutes must be properly baffled or hooded at the discharging end to
prevent separation of the aggregates. The delivery end of the chute shall be as close as possible to the
point of deposit. The chute shall be thoroughly flushed with water before and after each run, the water
used for this purpose being discharged outside the forms.

Concrete shall be deposited continuously and as rapidly as practicable until the unit of operations
approved by the Superintendent is completed. Any concrete which has taken its initial set shall be
tejected and under no circumstances shail concrete remain longer than 60 minutes after mixing before
being used.

Concrete that has partly set shall not be used and retempering or the addition of more water will not be
permitted after concrete has left the mixer or mixing board.

Concrete shall not be placed if the ambient air temperature is likely to be greater than 45°C during
placement or within two (2) hours subsequent to placement.

If the ambient air temperature measured at the point of placement is likely to exceed 35°C during placing
and finishing operations, the Contractor shall take practical precautions to ensure that the concrete can
be placed and finished without defects, otherwise it shall be rejected. Typical precautions include those
listed below.

4. At the Concrete Manufacturing Plant
» Shading aggregate stockpiles;
» Painting water tanks white;

» Insulating or burying delivery lines;

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