throughout the curing period.
3.5.6
Protection
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NOTE: Add more sophisticated requirements for
vibration control where appropriate.
**************************************************************************
No fire or excessive heat shall be permitted near or in direct contact with
concrete at any time. No vibratory earth compaction equipment or
pile-driving equipment shall be operated within 30 m 100 feet horizontally
of concrete less than 5 days old. Blasting shall not be permitted within
30 m 100 feet horizontally of concrete less than 90 days old. Blasting
plans shall be approved by the Contracting Officer. All galleries,
conduits, and other openings through the concrete shall be kept closed or
sealed during the entire construction period. The surface of the concrete
shall be protected from rain or snow during placing.
3.5.7
Cold Weather Protection
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NOTE: The editor must insert the insulating value
and the calendar dates in the appropriate blanks.
The values will be taken from the thermal study that
was performed during design of the structure. The
paragraph may be revised or expanded to provide
varying insulating values and dates for various
concrete features of the project in accordance with
the thermal study.
**************************************************************************
Between [_____] of each year and [_____] of the following year, all
concrete [less than 30 days old] [immediately after placing] shall be
covered for a period of [_____] days with insulation that provides an R
value not less than [_____] square meter degree Celsius per watt hour
square foot degree Fahrenheit per BTU.
a. The insulation shall be maintained in such a condition that the R
value does not diminish during the period of protection. Edges and
corners of the placement shall be protected with a double layer of the
insulation specified above for a minimum distance of 0.6 m 2 feet in
all directions.
b. Concrete placed prior to the starting date shall be insulated from
the starting date until it reaches an age of [_____] days. Concrete
placed after the starting date shall be continuously insulated during
and subsequent to placement [until it reaches an age of [_____] days
or] until the end of the protection period [, whichever comes first].
c. Forms shall be insulated in such a manner that the combined
form-insulation system shall have a thermal resistance (R value) not
less than that specified. Insulation and the combined form-insulation
system shall remain in place for at least 5 days after placement of the
concrete. After 5 days, forms and insulation on vertical surfaces may
be removed for periods not to exceed 4 hours in a 24 hour period to
allow forms to be moved, and insulation on horizontal surfaces may be
removed for periods not to exceed 8 hours in a 24 hour period to allow
reinforcement to be installed, insulation to be installed, lift joints
SECTION 03700
Page 68
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