[_____]. Concrete surfaces shall be finished with a float finish, and
after surface moisture has disappeared, the surface shall be troweled to a
smooth, even, dense finish free from blemishes including trowel marks.
3.4.1.3
[Abrasive Aggregate Finish
An abrasive aggregate finish shall be applied to the following surfaces:
[_____] [_____]. The concrete surface shall be finished with a float
finish. Abrasive aggregate shall be uniformly sprinkled over the floated
surface at a rate of not less than 1.22 kg/square meter 1/4 pounds per
square foot. The surface shall be troweled to a smooth, even finish that
is uniform in texture and appearance and free from blemishes including
trowels marks. Immediately after curing, cement coating or laitance
covering the abrasive aggregate shall be removed by steel brushing, rubbing
with abrasive stone, or sandblasting to expose the abrasive particles.]
3.4.1.4
[Broom Finish
A broom finish shall be applied to the following surfaces: [_____]
[_____]. The concrete surface shall be finished with a float finish. The
floated surface shall be broomed with a fiber-bristle brush in a direction
transverse to that of the main traffic.]
3.4.1.5
[Bonded Two-Course Floor
**************************************************************************
NOTE: Consult the appropriate DM or the Design
Engineer to choose from the optional paragraphs
below.
**************************************************************************
A bonded two-course floor shall be constructed by placing a bonded topping
on the thoroughly hardened concrete slab left a distance below final grade
as shown in the drawings. The floor topping mixture shall have a specified
compressive strength of 41.4 MPa 6,000 psi at 28 days, a 50 mm 2 inch
maximum slump, 13 mm 1/2 inch maximum-size coarse aggregate and shall be
proportioned to obtain required finishability. Materials shall meet the
requirements of paragraph MATERIALS. The surface of the base slab shall be
thoroughly cleaned by sandblasting or high pressure water jet in accordance
with paragraph PREPARATION FOR PLACING. The base slab shall be kept
continuously wet for the first 12 hours during the 24-hour period
immediately prior to placing the finished floor. After all free water has
evaporated or has been removed from the surface, a grout shall be scrubbed
in. The grout shall be a 1:1 mixture of portland cement and sand passing
the 2.36 mm No. 8 sieve mixed to a creamlike consistency. The grout shall
be applied just ahead of the concrete-placing operation. While the grout
is still damp, the top course shall be spread and screeded. The surface
shall then be floated with a disc power float or equivalent, followed by a
minimum of two power trowelings. Trowel marks left by the machine shall be
removed by final, hard steel troweling by hand. The finished floor shall
be moist cured in accordance with paragraph CURING AND PROTECTION,
subparagraph MOIST CURING.]
3.4.1.6
[Unbonded Two-Course Floor
An unbonded two-course floor shall be constructed by placing a bond-breaker
on the thoroughly hardened concrete slab left a distance below final grade
as shown in the drawings. The floor topping mixture shall have a specified
compressive strength of 41.4 MPa 6,000 psi 28 days, a 50 mm 2 inch maximum
SECTION 03301A
Page 37
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