Section 02527 CONCRETE PAVEMENTS, CURBS AND SIDEWALKS

Section 02527

CONCRETE PAVEMENTS, CURBS AND SIDEWALKS

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. The CONTRACTOR shall furnish all tools, equipment, materials, and supplies and shall perform all labor required to complete the Work as indicated in the Contract Documents and specified herein.

B. This section covers the Work necessary to construct the following concrete pavements, curbs and sidewalks, complete, in place in accordance with the requirements of the Contract Documents.

1. Curbs and sidewalks are shown on the Contract Documents and include curbing along East Perimeter Road, around the Thickening and Dewatering building, and other new facilities built as part of this project. See Drawings C1-1002 and C1-1003 for curb and sidewalk locations.

2. Concrete pavement is shown on the Contract Documents drawing C1-1001.

1.2 RELATED WORK SPECIFIED ELSEWHERE

A. The requirements of the following sections and divisions apply to the Work of this section. Other sections and divisions of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this Work.

1. Section 02200, Earthwork

2. Section 02232, Preparation of Pavement Subgrade

3. Section 03100, Concrete Formwork

4. Section 03200, Reinforcement Steel

5. Section 03290, Joints in Concrete

6. Section 03300, Cast-In-Place Concrete

7. Section 03350, Testing of Cementitious Material

8. Section 03360, Concrete Curing, Finishing and Dampproofing

1.3 REFERENCE SPECIFICATIONS, CODES AND STANDARDS

A. Comply with the applicable reference Specifications as specified in the General

Requirements.

B. Work of this section shall be performed in accordance with the Standard Specifications for Public Works Construction (SSPWC) unless otherwise specified in this Section.

1.4 CONTRACTOR SUBMITTALS

A. Submittals shall be made in accordance with the General Requirements and Additional

General Requirements.

1.5 QUALITY ASSURANCE

A. Comply with the applicable reference Specifications of the General Requirements.

PART 2 - PRODUCTS

2.1 FORMS

A. Form material shall be in conformance with SSPWC Section 303-5.2.

2.2 DRAINAGE OUTLET THROUGH CURB

A. Curb drainage outlets shall be constructed in conformance with SSPWC Section 303-

5.1.2.

2.3 CRUSHED AGGREGATE BASE

A. Crushed Aggregate Base shall conform to SSPWC Section 200-2.2.

2.4 EXPANSION JOINT FILLER

A. Expansion joint filler shall be 1/2 inch thick, preformed asphalt-impregnated, expansion joint material conforming to ASTM D 994.

2.5 CONCRETE

A. Refer to Section 03300, Cast-in-Place Concrete.

2.6 REINFORCING

A. Refer to Section 03200, Reinforcement Steel.

2.7 CURING COMPOUND

A. Refer to Section 03360, Concrete Curing, Finishing and Dampproofing.

2.8 ACCEPTANCE OF MATERIALS

A. All materials shall be subject to testing, inspection and acceptance by the

ENGINEER at any time prior to or during the Work, as applicable.

2.9 EXCAVATION AND BACKFILL

A. Refer to Section 02200, Earthwork.

PART 3 - EXECUTION

3.1 GENERAL

A. Unless otherwise specified, all curb and gutter is aligned by the top front edge of the curb, which is set as to alignment and grade. All other dimensions for the curb and gutter section are taken from this edge.

B. Construction joints or weakened-plane joints shall be used to mark locations on curbing where aprons will be constructed for driveway and handicap access ramps.

C. Unless otherwise specified on the Contract Documents, forms for sidewalk construction shall be set to place the finished surface in a plane sloping up from the top of curb at a rate of 1/4 inch per foot when measured at right angles to the face of curb. Where this grade does not meet existing improvements, such as private driveway slabs or building entrances, the CONTRACTOR shall notify the ENGINEER, who shall adjust sidewalk grades accordingly.

D. Where existing concrete curb, gutter or sidewalk is being replaced, improvements shall be removed back to the nearest joint before beginning replacement.

E. The edge of existing asphalt shall not be used as a form for new curb and gutter. Existing Asphalt shall be cut back a minimum of 1 foot, new curb and/or gutter constructed and asphalt replaced.

3.2 EXCAVATION AND BACKFILL

A. Excavation and backfill shall be in conformance with Section 02200, Earthwork.

3.3 PREPARATION OF SUBGRADE

A. Preparation of subgrade shall be in conformance with Section 02232, Preparation of

Pavement Subgrade.

3.4 PLACING CRUSHED AGGREGATE BASE

A. Crushed Aggregate Base shall be in conformance with the SSPWC Section 301-2.2. B. Crushed Aggregate Base shall be compacted in conformance with SSPWC Section

^{301-2.3 with the exception that all subgrade shall be compacted to 95 percent relative}

density.

3.5 SETTING FORMS

A. Setting forms shall be in conformance with SSPWC Section 303-5.2.1.

3.6 SLIP FORMING

A. Slip-form equipment shall be in conformance with SSPWC Section 303-5.2.2.

3.7 EXPANSION JOINTS

A. Expansion joints shall be constructed in conformance with SSPWC Section 303-

5.4.2.

3.8 WEAKENED PLANE JOINTS AND CONTROL JOINTS

A. Weakened plane joints shall be placed in conformance with SSPWC Section 303-

5.4.3.

3.9 PLACING CONCRETE

A. Concrete shall be placed in conformance with SSPWC Section 303-5.3.

3.10 FINISHING

A. General: Finishing shall be completed as specified herein for the type of work being performed.

B. Pavement: Float by longitudinally reciprocating float, passing gradually from edge to edge. Assure successive advances do not exceed half the length of the float. Test level of slab with minimum 10-foot straightedge. Fill depressions with fresh material, consolidate and refinish. Cut down high areas and retest. Belt surface with two-ply canvas belt, using transverse strokes while advancing along center line. Provide final finish by full width burlap or carpet drag, drawn longitudinally. Keep drag clean to avoid build up and consequent scarring. Tool pavement edges with suitable edger. Retest with straightedge and if pavement shows deviation of more than 1/8 inch in 10 feet, remove and replace.

C. Curb: The stripping of front forms and finishing of curb shall be in conformance with SSPWC Section 303-5.5.2. Where the back of new curb is exposed, it shall likewise be finished in conformance with SSPWC Section 303-5.5.2.

D. Walk: The finished surface of the walk shall be in conformance with SSPWC Section

303-5.5.3.

E. Gutter: The gutter shall be finished in conformance with SSPWC Section 303-5.5.4. F. Access Ramps and Driveways: The Access Ramps and Driveways shall be finished

in conformance with SSPWC Section 303-5.5.5.

G. Painting: Curbs which were previously painted shall be repainted as shown on the

_{Drawings per city/county/state requirements.}

3.11 CURING

A. Refer to Section 03360, Concrete Curing Finishing and Dampproofing.

3.12 OPENING TO TRAFFIC

A. After 14 days, pavement may be opened to traffic if job cured test cylinders have attained a compressive strength of 3,000 pounds per square inch when tested in accordance with ASTM standard methods.

B. Prior to opening to traffic, clean and refill joints as required with the specified filler material.

3.13 FIELD QUALITY CONTROL

A. Provide test cylinders per section 03350, Testing of Cementitious Material. B. Pavement Thickness Testing.

1. General:

a. Core pavement to determine the actual thickness, as directed by Engineer. b. Determine thickness by ASTM C174.

c. Fill holes from removal of cores with concrete of the same mixture as specified.

d. Cost incidental to coring of cores showing a deficiency greater than 1/4 inch shall be paid by the Contractor.

e. Cost of cores showing a deficiency of 1/4 inch or less shall be paid by the

Owner.

f. If average pavement thickness, as directed by core measurement, is outside specified tolerances, payment will be reduced per PART 1 of this Specification Section.

g. If deficiency in pavement thickness is 1 inch or more, remove and replace pavement at Contractor's expense.

2. Core categories:

a. In determining the average thickness of acceptable pavement for which payment will be made, utilize the following core categories:

Category

_Number

Core Thickness in

_{Relation to Design}

Core Length Used in

_Calculating

_{1 1 inch or more deficiency NOT USED}

2 Less than 1 inch deficiency through 1/2 inch excess

Actual Core Thickness

_{3 More than 1/2 inch excess Design Thickness plus 1/2 inch}

b. Core sampling:

1) Take cores in each lane in each block.

c. Take cores at locations where the cement content was found to be low when checking the quantities of cement used during the progress of the work.

d. Each separately poured lane of the pavement to be considered as a unit.

e. A lane shall be considered to be the pavement surface between longitudinal construction joints, between a longitudinal construction joint and the edge, or between two (2) pavement edges in cases where the entire width of the pavement is poured in one (1) operation.

f. Should any core show a deficiency in thickness in excess of 1 inch, check cores shall be taken 5 feet on either side of this location parallel to the centerline of the pavement.

g. If both of these cores are within the 1 inch tolerance, no further special borings for this individual zone of deficiency will be made.

h. If either one (1) or both of these cores are not within the 1 inch tolerance, the procedure will be to cut cores in the following order on either side of the original short core parallel to the centerline of the pavement:

1) 25 feet, 50 feet, the same to be measured from the location of original core found to be deficient in thickness, then at 50 feet intervals until a thickness within the 1 inch tolerance is found in both directions.

2) On either side of the original deficient core, the procedure will then be to make a coring approximately half the distance within the first core which comes within the 1 inch tolerance.

3) Repeat the above procedure until the station (+5 feet), at which the pavement comes within the 1 inch tolerance is located.

4) If for some reason two (2) or more cores are taken at the same station and at least one (1) of them is beyond the 1 inch tolerance, the section of pavement at the station shall be considered as unacceptable.