1.8.1.2
Floors by the F-Number System
The flatness and levelness of floors shall be carefully controlled and the
tolerances shall be measured by the F-Number system of Paragraph 4.5.6 and
4.5.6.1 of ACI 117. The Contractor shall furnish an approved floor
profilograph or other equipment capable of measuring the floor flatness
(FF) number and the floor levelness (FL) number in accordance with ASTM E
1155M ASTM E 1155. The Contractor shall perform the tolerance measurements
within 72 hours after floor slab construction while being observed by the
Contracting Officer. The tolerances of surfaces beyond the limits of ASTM
E 1155M ASTM E 1155 (the areas within 600 mm 24 inches of embedments and
construction joints) shall be acceptable to the Contracting Officer.
Tolerances of the following areas shall meet the requirements for the
listed surfaces as specified in paragraphs 4.5.6 and 4.5.6.1 of ACI 117.
Bullfloated-
Areas
[_____]
Straightedged-
Areas
[_____]
Float Finish-
Areas
[_____]
Trowel Finish-
Areas
[_____]
Very Flat-
Areas
[_____]
1.8.1.3
Floors by the Straightedge System
The flatness of the floors shall be carefully controlled and the tolerances
shall be measured by the straightedge system as specified in paragraph
4.5.7 of ACI 117, using a 3 m 10 foot straightedge, within 72 hours after
floor slab installation and before shores and/or forms are removed. The
listed tolerances shall be met at any and every location at which the
straightedge can be placed.
Bullfloated
[_____]
Straightedged
[_____]
Float Finish
[_____]
Trowel Finish
[_____]
1.8.2
Strength Requirements and w/c Ratio
1.8.2.1
Strength Requirements
**************************************************************************
NOTE: The designer will list the strengths of
concrete for the job and the uses for each. A
28-day compressive strength of 20 MPa (3000 psi)
will be required for most building work. Concrete
of 27.5 MPa (4000 psi) should be used in containers
for liquids, and in other structures where loading,
durability, or wear requirements dictate. Higher
compressive strengths will be used if required by
structural design. A 28-day flexural strength of
4.5 MPa (650 psi) will normally be specified for
slabs on grade subject to vehicular traffic;
however, since cylinders are easier to cast and test
than beams, 27.5 MPa (4000 psi) compressive strength
concrete may be specified if past experience has
shown this to be appropriate. Concrete for hangar
floors will be designed according to airfield
pavement criteria and will be specified in Section
02751 AIRFIELDS AND HEAVY-DUTY CONCRETE PAVEMENT
LESS THAN 10000 CUBIC YARDS.
SECTION 03300A
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