to be prepared, etc. provided that suitable precautions are taken to
prevent the concrete from being subjected at any time to ambient
temperatures of minus 7 degrees C 20 degrees F or below.
d. The first 1.8 m 6 feet of all steel protruding from insulated
concrete shall be insulated with material having an R value as stated.
All form bolts and metal ribs on the forms shall be insulated in a like
manner. During the period of protection there shall be no holes or
openings in the insulation or between the insulation and concrete which
permit ambient air to penetrate the insulation except as noted for
construction purposes. Special attention shall be given to seams,
corners, and edges to prevent holes or openings in the insulation.
3.6
BASE PLATES AND BEARING PLATES
3.6.1
Setting of Plates
After being plumbed and properly positioned, column base plates, bearing
plates for beams and similar structural members, and machinery and
equipment base plates shall be provided full bearing using nonshrink grout.
The space between the top of the concrete bearing surface and the bottom
of the plate shall not be less than 1/24 of the width of the plate or 13 mm
1/2 inch, whichever is greater. Concrete surfaces shall be clean, free of
oil, grease, and laitance, and shall be damp. Metal surfaces shall be
clean and free of oil, grease, and rust.
3.6.2
Nonshrink Grout
Nonshrink grout shall conform to the requirement of paragraph MATERIAL
SPECIFICATION. Water content shall be the minimum that will provide a
flowable mixture and completely fill the space to be grouted without
segregation, bleeding, or reduction of strength.
3.6.2.1
Mixing and Placing
Mixing and placing shall be in conformance with the material manufacturer's
instructions and as specified. Ingredients shall be thoroughly dry-mixed
before adding water. After adding water, the batch shall be mixed for 3
minutes. Batches shall be sized to allow continuous placement of freshly
mixed grout. Grout not used within 30 minutes after mixing shall be
discarded. The space between the top of the concrete or masonry bearing
surface and the plate shall be filled with the grout. Forms shall be of
wood or other suitable material for retaining the grout and shall be
removed after the grout has hardened. If Grade "A" grout is used, all
surfaces, including top surfaces, shall be formed to provide restraint.
The placed grout shall be worked to eliminate voids; however, overworking
and breakdown of the initial set shall be avoided. Grout shall not be
retempered or subjected to vibration from any source. Where clearances are
unusually small, placement shall be made under pressure with a grout pump.
Temperature of the grout, and of surfaces receiving the grout, shall be
maintained at 20 to 30 degrees C 65 to 85 degrees F until after setting.
3.6.2.2
Treatment of Exposed Surfaces
Those types of grout containing metallic aggregate, Grade B or C grout,
shall, after setting, have exposed surfaces under cut back 1 inch from the
edge of the base plate and immediately covered with a thick coat of mortar
proportioned by weight of one part portland cement, two parts sand, and
sufficient water to make the mixture placeable. The parge coat shall have
SECTION 03700
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