HomeMy WebLinkAboutSection 02510 Concrete Walkways
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SECTION 02510 CONCRETE WALKWAYS, CURBS AND GUTTERS, RAMPS, DRIVE- WAYS,
MISCELLANEOUS CONCRETE SLABS AND WHEEL STOPS
PART 3 - GENERAL
3.01 SCOPE:
A. Summary of Work: The CONTRACTOR shall furnish all labor, materials and
equipment necessary to reinstate and restore existing concrete walkways, curbs and
gutters, ramps, miscellaneous concrete slabs and wheel stops, damaged during
construction or as shown on the drawings.
1. SECTION 03300 - Cast-In-Place Concrete
3.02 APPLICABLE PUBLICATION:
A. Florida Department of Transportation Standard Specifications for Road and Bridge
Construction, latest edition, (FDOT).
3.03 SUBMITTALS: Shop drawings for reinforcing, joint material and mix designs shall be
submitted for review in accordance with Section 01300.
3.04 CERTIFICATIONS AND TESTING: Perform tests in accordance with standards
hereinafter specified.
3.05 INSPECTION COORDINATION: The CONTRACTOR shall provide access to the WORK
for the ENGINEER as requested for inspection. The Contractor shall provide 48 hours
notice of its intention to begin new WORK activities.
PART 4 - PRODUCTS
4.08 CONCRETE: The CONTRACTOR shall provide concrete for sidewalks, curbs and gutters,
ramps and miscellaneous concrete slabs as specified in FDOT Specifications - Section
345 “Portland Cement Concrete.” For miscellaneous concrete slabs Class I concrete shall
have a minimum strength of 3000 psi.
4.09 METAL ACCESSORY MATERIALS: The CONTRACTOR shall provide metal accessory
materials for miscellaneous concrete slabs as indicated on the Drawings and as specified
in FDOT Specification - Section 931.
4.10 PRE-CAST CONCRETE WHEEL STOPS: The CONTRACTOR shall furnish pre-cast
concrete wheel stops that are nominally six inches high by eight inches wide by six feet
long or accepted equivalent. One wheel stop shall be furnished per parking space or as
shown on the Drawings. Wheel stops shall be reinforced with two #4 bars.
4.11 FORMS: The CONTRACTOR shall furnish forms for the forming of the concrete curb in
accordance with the following:
A. The forms shall be wood or metal.
B. The forms shall be straight and strong enough to resist springing during placement of
concrete.
C. The forms shall have sufficient bearing surface to prevent tipping.
D. The height of the forms shall be equal to full depth of section to be constructed.
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E. Slip form.
2.05 REINFORCING AND WELDED WIRE FABRIC
A. Joint reinforcing and welded wire fabric shall conform to the requirements of Division
3.
2.06 PREFORMED JOINT FILLER
A. Preformed joint filler shall be sponge rubber or cork and conform to the
requirements of AASHTO Designated MI 53, Type 1 or 11.
2.04 CURING COMPOUND
A. Curing Compound shall conform to the requirements of AASHTO M148, Type 1.
PART 3 - EXECUTION
3.01 SUBGRADE CONDITION
A. The finished subgrade shall be maintained in a smooth, compact condition and any
areas which are disturbed prior to placing of the concrete shall be restored at no
additional cost to the OWNER.
B. The subgrade shall be moist at the time the concrete is placed. Water shall be
uniformly applied ahead of the paving operations as directed by the ENGINEER. If
the CONTRACTOR does not maintain the subgrade in the required moist condition,
a polyethylene sheet vapor barrier will be required between the subgrade and the
concrete.
C. The subgrade shall be accurately trimmed to the required elevation with a %-inch
tolerance. High areas shall be trimmed to proper elevation. Low areas may be filled
with suitable material and compacted to the specified density or filled with concrete
integrally with the placing of the pavement. Boulders, rocks or obstructions larger
than 1-inch diameter shall be removed to minimum depth of 6-inches below finished
subgrade. The subgrade shall be compacted at optimum moisture content to 98
percent of maximum dry density in accordance with ASTM Dl557 method D.
3.02 CONCRETE WALKS AND RAMPS: The CONTRACTOR shall construct concrete
sidewalks and ramps as specified in FDOT Specifications - Section 522 where shown on
the Drawings, as required by the ADA requirements or as necessary to restore existing
conditions.
A. The CONTRACTOR shall furnish a template and shall thoroughly check the
subgrade prior to depositing concrete. Sidewalks shall be given a light broom
finish.
B. All damage to sidewalk as a result of work under this Contract shall be repaired in
a manner satisfactory to the ENGINEER and at no additional cost to the OWNER.
The repair shall include all work as specified herein.
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C. The width of all repairs shall extend at least 12 inches beyond the limit of the
damage, and no more than 3 sidewalk flags. The edge of the sidewalk to be left
in place shall be cut to a true edge along an existing expansion joint or edge of
flag, with a saw or other approved method so as to provide a clean edge to abut
the repair. The line of the repair shall be reasonable uniform with no unnecessary
irregularities.
3.03 CURBS AND GUTTERS: The CONTRACTOR shall construct concrete curbs and gutters
as specified in FDOT Specifications - Section 520 where shown on the Drawings and as
necessary to restore existing conditions.
A. Curbs shall be constructed in uniform sections ten feet in length except where
shorter sections are necessary for closures or arcs. The sections shall be
Separated by sheet metal templates set perpendicular to the face and tip of the
curve and not less than 2 inches longer than the depth of the curb. The templates
shall be held firmly during the placing of the concrete and shall be allowed to
remain in place until the concrete has set sufficiently to hold its shape, but shall be
removed while the forms are still in place.
B. After the concrete has sufficiently set for a minimum of 12 hours, the
CONTRACTOR shall remove the forms and backfill the spaces on each side. The
earth shall be compacted in satisfactory manner without damage to the concrete
work. Minor defects shall be filled with a mortar composed of one part Portland
cement and two parts fine aggregate.
3.04 MISCELLANEOUS CONCRETE SLABS: The CONTRACTOR shall construct
miscellaneous concrete slabs for mechanical equipment as indicated on the Drawings and
as specified in FDOT Specifications Section 350.
3.05 PRE-CAST CONCRETE WHEEL STOPS: The CONTRACTOR shall install pre-cast
concrete wheel stops by anchoring them with at least two three-quarter inch round
reinforcing bars driven a minimum of one foot into the pavement. Use a setting tool to
recess anchor rod a minimum of one-half inch below the top surface and caulk the
opening. Wheel stops damaged when driving rods shall be replaced with new bumpers.
3.06 FORMS: The CONTRACTOR shall install the forms in accordance with the following:
A. Use flexible forms for all curved form lines except:
1. Curves having a radius of 200 feet or greater may be formed in 10 foot or
shorter chords.
2. Curves having a radius of 100 feet or greater may be formed in 5 foot or
shorter chords.
B. Thoroughly clean, oil, securely stake, brace, and hold forms to line and grade.
C. Remove forms from front face of curb section at the time necessary to permit
finishing concrete. Leave other forms in place not less than 12 hours after
placement of concrete.
3.07 JOINTS: The CONTRACTOR shall install joints in the curbs as follows:
A. Contraction Joints:
1. Construct at locations indicated and as follows:
a. Division concrete curb into monolithic sections not greater than 10 inches
in length.
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2. Form contraction joints by any of the following methods:
a. Place one half inch thick steel separators after concrete has taken its
initial set, but before final finishing.
b. Cut a groove in the fresh concrete to a depth of at one quarter the section
thickness by use of a jointer having a radius of one half inch and
thickness not exceeding one half inch.
c. Saw the hardened concrete before shrinkage cracking occurs. Depth of
cut not less than one quarter the section thickness and width of key not to
exceed three sixteenths inch.
B. Expansion Joints:
1. Construct at the following locations:
a. Locations as indicated.
b. All points of curvature and points of tangency of curves having a radius of
100 inches or less and at intervals not exceeding 60 inches in tangent
section.
c. Locations where curb abuts other structures and slabs.
2. Stake, support, and secure preformed joint filler in position to prevent
displacement during and finishing operations.
3. Round edges of joints with an edging tool of one quarter inch radius.
C. Construction Joints:
1. Locate to coincide with contraction, expansion or key joints.
2. When concrete placement is interrupted between joint locations for a sufficient
time for the concrete to take its initial set, remove concrete to the nearest joint
location before resuming placement.
3.08 STRAIGHTEDGING AND SURFACE CORRECTIONS
A. After floating has been completed and the excess water removed, but while the
concrete is still in a plastic state, the surface of the concrete shall be tested for
trueness with an accurate 10 foot straightedge. The straightedge shall be
furnished by the CONTRACTOR. The straightedge shall be held in successive
positions parallel to the road center line, in contact with the surface, and the whole
area tested from one side of the slab to the other as necessary. Any depressions
shall be immediately filled with freshly mixed concrete and struck-off, consolidated
and refinished. High areas shall be cut down and refinished. Straightedge testing
and surface correction shall continue until the entire surface appears to conform
to the required grade and cross section.
3.09 FINAL FINISH: As soon as the water sheen has disappeared from the surface of the
pavement and just before the concrete becomes nonplastic, a light broom finish shall be
given to the surface.
3.10 EDGING
A. After the final finish has been applied, but before the concrete has become
nonplastic, the edges of the pavement along each side of the strip being placed, on
each side of construction joints and along any structure extending into the
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pavement, shall be carefully rounded to a 1/4-inch radius except as otherwise
indicated. A well-defined and continuous radius shall be produced and a smoother,
dense mortar finish obtained. All concrete shall be completely removed from the top
of the joint filler.
B. All joints shall be checked with a straightedge before the concrete has become
nonplastic and, if one side of the joint is higher than the other or the entire joint is
higher or lower than the adjacent slabs, corrections shall be made as necessary.
3.11 CURING
A. After the finishing operations have been completed and as soon as the concrete
has hardened sufficiently that marring of the surface will not occur, the entire
surface and the edges of the newly placed concrete shall be covered and cured
with membrane curing compound.
B. Curing compound shall be uniformly applied to the surfaces to be cured, in a single
coat, continuous film, at the rate of one gallon to not more than 200 square feet, by
a mechanical sprayer.
C. Curing compound shall not be applied during periods of rainfall. Curing compound
shall not be applied to the inside faces of joints to be sealed. Should the film
become damaged from any cause within the required curing period, the damaged
portions shall be repaired immediately with additional compound. Upon removal of
side forms, the sides of the slabs exposed shall immediately be coated to provide a
curing treatment equal to that provided for the surface.
END OF SECTION