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

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Forms may be used repeatedly provided they are maintained in a serviceable condition and are
thoroughly cleaned and re-oiled before being re-used.

The removal of forms shall not be commenced until the concrete has attained the necessary strength to
support its own mass and any construction live loads.

Uniess otherwise specified, forms and falsework shall remain in position until the times stated below
have elapsed after completion of concreting.

» Non structural concrete:

— Until such time as the concrete has reached 50% of the characteristic 28 day strength or a period
of 3 days, whichever is the lesser.

» Structural concrete:
Soffits of slabs, headstock and diaphragms
— Until such time as the concrete has reached 70% of the characteristic 28 day strength of 7 days,
whichever is the lesser.
Side forms on structural concrete

- 3days minimum.
Forms shall be removed with a minimum of hammering, !evering or wedging.

Forms of vertical walls and foundations may be stripped forty-eight (48) hours after placing of the
concrete unless otherwise required by the Superintendent, but no force of any kind shall be applied to
the concrete for seven (7) days after the placing of the concrete. Forms for horizontal slabs shall not be
removed for a minimum of seven (7) days after pouring.

Loosening of forms in preparation for stripping shall in no case be commenced prior to the elapse of the
appropriate minimum period as specified above.

6.11 Curing of Concrete

All concrete surfaces, when not protected by forms or approved membrane curing compounds, must be
kept constantly wet for a period of not less than seven (7) days after concrete is placed. If wooden forms
are left in place they shall be wet at all times during the curing period. Wet curing of vertical surfaces of
concrete after removal of forms may be accomplished by covering with hessian kept continuously wet.

Horizontal surfaces may be wet cured by the same methods or by covering with a layer of sand or
sawdust kept continuously wet, or by ponded water.

Membrane curing may be substituted for wet curing when approved by the Superintendent. Membrane
curing compound shall not be applied to the surface of construction joints or bearing areas where
concrete or grout is subsequently to be placed. Only approved non-staining liquid membrane-forming
compounds are to be used.

The compound shall be applied in strict accordance with the manufacturer's specification and shall be
sprayed on as soon as the surface water has disappeared.

41/22382/11840 Girraween Sports Precinct 40
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