PART 3
EXECUTION
3.1
INSTALLATION
3.1.1
Form Construction
Forms shall be constructed true to the structural design and required
alignment. The form surface and joints shall be mortar tight and supported
to achieve safe performance during construction, concrete placement, and
form removal. The Contractor shall continuously monitor the alignment and
stability of the forms during all phases to assure the finished product
will meet the required surface class [or classes] specified in paragraph
FORMS AND FORM LINERS and tolerances specified in paragraph DESIGN
REQUIREMENTS. Failure of any supporting surface either due to surface
texture, deflection or form collapse shall be the responsibility of the
Contractor as will the replacement or correction of unsatisfactory
surfaces. When forms for continuous surfaces are placed in successive
units, care shall be taken to fit the forms over the completed surface to
obtain accurate alignment of the surface and to prevent leakage of mortar.
Forms shall not be re-used if there is any evidence of defects which would
impair the quality of the resulting concrete surface. All surfaces of used
forms shall be cleaned of mortar and any other foreign material before
reuse.
3.1.2
Chamfering
All exposed joints, edges and external corners shall be chamfered by
molding placed in the forms unless the drawings specifically state that
chamfering is to be omitted or as otherwise specified. Chamfered joints
shall not be permitted where earth or rockfill is placed in contact with
concrete surfaces. Chamfered joints shall be terminated 300 mm twelve
inches outside the limit of the earth or rockfill so that the end of the
chamfers will be clearly visible.
3.1.3
Coating
Forms for exposed or painted surfaces shall be coated with form oil or a
form-release agent before the form or reinforcement is placed in final
position. The coating shall be used as recommended in the manufacturer's
instructions. Forms for unexposed surfaces may be wet with water in lieu
of coating immediately before placing concrete, except that, in cold
weather when freezing temperatures are anticipated, coating shall be
mandatory. Surplus coating on form surfaces and coating on reinforcing
steel and construction joints shall be removed before placing concrete.
3.2
FORM REMOVAL
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NOTES: For unsupported concrete, form removal is
based upon a minimum time requirement of 24 hours.
As an option, form removal may be allowed between 18
hours and 24 hours after placement. In this case,
form removal is based upon a minimum time (18
hours), minimum ambient temperature (10 degrees C
(50 degrees F)), and minimum compressive strength
requirement. For supported concrete, form removal
is based solely upon a minimum compressive strength
requirement.
SECTION 03101A
Page 7
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