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SECTION 02751 / PORTLAND CEMENT CONCRETE PAVING, CURBS, SLABS
and WALKS, DETECTABLE WARNINGS
PART 1 - GENERAL
1.01
RELATED DOCUMENTS
A.
Conform to Division 1, Section 02000 and other sections of this division.
1.02
SUBMITTALS
A.
Submit in accordance with General, Supplementary and Special Conditions.
1.03
RELATED WORK IN OTHER DIVISIONS/SECTIONS
Division 3:
Section 02300:
Concrete
Grading and Earthwork (for site outside building area)
1.04
QUALITY ASSURANCE
A.
Perform work in accordance with Sections 345, 350, 520, and 522, Florida
Department of Transportation Standard Specification for Road and Bridge
Construction (latest edition).
B.
Obtain cementitious materials from same source throughout.
1.05
REGULATORY REQUIREMENTS
A.
Conform to applicable standards for paving work on public property.
1.06
ENVIRONMENTAL REQUIREMENTS
A.
Do not place concrete when base surface temperature is less than 40 degrees F or
surface is wet.
PART 2 - PRODUCTS
2.01
Concrete Curbs
A.
Concrete curbs shall be constructed in conformity with the lines, grades, dimensions
and notes as shown on the drawing and in accordance with Section 520 of the
D.O.T. Standard Specifications.
B.
Materials and workmanship shall conform to Section 530 of the Florida Department
of Transportation Standard Specifications for Road and Bridge Construction, Latest
Edition, and to Division One of the Standard Specifications.
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C.
Forms must be capable of providing curb and gutter true to alignment and grade
and have sufficient divider plates to maintain the true cross section pattern. Hand
rodding or vibrators shall be carefully employed to minimize “honeycomb” areas and
such areas shall be patched as soon as possible after form stripping. Curb and
gutters shall receive a steel trowel dressing, appropriate radius tooling, and be given
a brush finish with a fine fiber brush.
D.
Curb and gutter work must be kept moist to provide proper curing and sufficiently
protected to prevent damage during subsequent construction work. Drop curbs,
radius sections, inlet warps, and other changing sections must be carefully formed
and finished to provide a gentle pleasing appearance.
2.02
CONCRETE WALKS/SLABS
A.
All walks and slabs are to be placed over 10 mil polyethylene vapor barrier.
B.
Sidewalks and slabs shall be size, thickness and layout as detailed in architectural
drawings.
C.
Accessories: Deck-O-Foam (zip-strip”) expansion joint filler, 1/4” to 1/2” thick (1/4”
maximum at elevated slabs) x slab depth in continuous roll, non-staining,
polyethylene, closed-cell foam, by W.R. Meadows or equivalent. Filler shall be prescored to allow for removable tope edge strip to create reveal for sealant.
2.03
DETECTABLE WARNINGS
A.
Curb ramps at medians and refuge islands, and locations where medians and
refuge islands are cut through level with the street at crosswalks, shall have
detectable warnings.
B.
Detectable warnings shall be 20” minimum in the direction of travel and extend the
full width of the curb ramp or flush with the surface.
C.
The detectable warning shall be located so that the edge nearest the curb line or
other potential hazard is 6 to 8 inches from the curb line or other potential hazard,
such as a reflecting pool edge or the dynamic envelope of the rail operations.
D.
Truncated domes shall have a diameter of 0.9 inch at the bottom, a diameter of 0.4
inch at the top, a height of 0.2 inch and a center-to-center spacing of 2.35 inches
measured along one side of a square arrangement.
E.
Domes shall be aligned on a square grid in the predominant direction of travel to
permit wheel to roll between domes.
F.
There shall be a minimum of 70% contrast in light reflectance between the
detectable warning and an adjoining surface or the detectable warning shall be
“safety yellow”. The material used to provide visual contrast shall be an integral part
of the detectable warning surface.
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PART 3 - EXECUTION
3.01
EXAMINATION
A.
Verify base conditions before beginning construction.
B.
Verify compacted subgrade is acceptable and ready to support paving and imposed
loads.
C.
Verify gradients and elevations of base are correct.
3.02
PREPARATION
A.
Notify ARCHITECT minimum 24 hours prior to commencement of concreting
operations.
3.03
FORMING
A.
Place and secure forms to correct location, dimension, and profile.
B.
Forming and pour of side walks shall be in a checkerboard method.
C.
Assemble formwork to permit easy stripping and dismantling without damaging
concrete.
D.
Joint filler material is not required nor shall be used between adjacent pours.
3.04
REINFORCEMENT
A.
Place reinforcement as indicated on architectural/structural drawings.
B.
Typical walks and curbs shall have steel mesh reinforcement. Use of fibermesh
concrete shall have prior approval of the OWNER.
3.05
PLACING CONCRETE
A.
Place concrete in accordance with Division 3.
B.
Ensure reinforcement, inserts, embedded parts, and formed joints are not disturbed
during concrete placement.
C.
Place concrete continuously between predetermined construction joints. Do not
break or interrupt successive pours such that cold joints occur.
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3.06
JOINTS
A.
Place construction joints at 12-foot intervals on curb. Place expansion joints at
maximum 30-foot intervals and control joints at maximum 5-foot intervals on
sidewalk, unless noted otherwise on drawings. Align curb and sidewalk joints.
B.
Provide tooled joints and edges. Tool joints 1 1/4" into depth of slab.
C.
Provide pre-manufactured joint filler cast-in-place between the sidewalk and curb or
driveway, at fixed objects or buildings, where sidewalks intersect, change directions,
and as otherwise indicated on the drawings. Joint filler shall be equal to Paragraph
2.02, C this section.
3.07
FINISHING
A.
Portland Cement Paving: Finish in accordance with Section 350, SSFR & BC.
1.
A power screed shall be used for paved playcourt work. Final finish shall be
light broom with direction oriented across short axis of court.
B.
Sidewalk Paving: Light broom, radius edges to 1/2 inch radius.
C.
Curbs and Gutters: Light broom.
D.
Inclined Ramps: Light broom.
E.
Curb cuts and side flares: exposed river rock aggregate. Lightly wash top surface
after partial curing to expose top surface of river rock aggregate, to produce smooth
uniform appearance.
1.
Form and install as a separate pour.
F.
Place curing compound on exposed concrete surfaces immediately after finishing.
Apply in accordance with manufacturer's instructions.
3.08
FIELD QUALITY CONTROL
A.
Field inspection and testing will be performed under provisions of Section
01400/Quality Control Services.
3.09
PROTECTION
A.
Immediately after placement, protect pavement from premature drying, excessive
hot or cold temperatures, and mechanical injury.
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3.10
SCHEDULES
Concrete Curb: Shape as detailed.
Concrete Pavement/Sidewalk: As detailed on architectural/structural
drawings.
END OF SECTION 02751