02525-1

Precast Concrete Curbs

SECTION 02525

PRECAST CONCRETE CURBS

1. PART 1 - GENERAL

1.01 SECTION INCLUDES

A. Precast concrete curbs for driveways as indicated on Drawings.

B. Precast concrete wheel stoppers

1.02 REFERENCES

A. Conform to the applicable requirements specified in Section 03300 - CAST-IN-PLACE CONCRETE.

1.03 SUBMITTALS

A. Shop drawings indicating all dimensions of modules proposed for use, including composition of the various elements.

B. Copies of all test reports indicating mix components and test results in compliance with specification requirements.

C. The Contractor shall submit samples of precast concrete curbs and stoppers for approval of quality, color, finish and texture.

1.04 QUALITY ASSURANCE

A. Conform to the applicable requirements of the following Divisions:

1. Division 2 - SITEWORK

2. Division 3 - CONCRETE

For the requirements of materials and workmanship, testing and quality assurance.

2. PART 2 - PRODUCTS

2.01 MATERIALS

A. Materials used shall conform to the requirements of Section 03300 - CAST-IN-PLACE CONCRETE.

02525-2

Precast Concrete Curbs

B. Precast Concrete Curbs

1. Construction: Manufacture precast curbs using Class 30 concrete conforming to the requirements of Section 03300 - CAST-IN-PLACE CONCRETE. Portland cement shall conform to SSA 143 or ASTM C 150.

2. Size: 500 x 300 x 150 and as indicated on Drawings.

3. Fabrication: Concrete curbs shall be manufactured by hydraulic pressing in an approved machine using concrete produced in a fully automatic batching plant. Finished elements shall be of sound appearance with clean planar faces, free from segregation, honeycombing, pits, broken corners and other defects. Bullnoses and curved faces shall be of constant radius with a smooth change from radius to plan face. Manufacturing tolerances shall be 3 mm in any one dimension and end faces shall be truly perpendicular to the base.

C. Precast Concrete Wheel Stopper:

1. Construction: Manufactured from 30 MPa concrete using type I cement conforming to the requirements of Section 03300 - CAST-IN-PLACE CONCRETE. Size and shape shall be as shown on the Drawings or as approved by the Engineer. Provide the finished elements with sound appearance and clean planar faces, free from segregation, honeycombing, pits, broken corners and other defects.

2. Grout: As approved by the Engineer.

a. Construction: High strength, non-shrink cementitious grout, ready-to-use, supplied in powder form and requires only on-site addition of water to produce non-shrink grout of predictable performance.

3. PART 3 - EXECUTION

3.01 INSTALLATION

A. Elements shall be set out to lines and grades as shown. Under no circumstances shall levels be set by direct measurement.

B. Foundation shall be excavated to the grades and sections shown and fully compacted and rolled to a smooth surface. Concrete shall not be placed until the foundation has been approved.

02525-3

Precast Concrete Curbs

C. Elements shall be laid either directly on a wet concrete base or on 1-3 cement-sand mortar bed, 20 mm thick on a previously laid concrete base. Base shall be constructed of Class 20 concrete conforming to the requirements of Section 03300-CAST-IN-PLACE CONCRETE.

D. After elements have been laid, continuous concrete backing shall be poured. Backing concrete shall be of Class 20 conforming to the requirements of Section 03300 - CAST-IN-PLACE CONCRETE.

E. Joints between curbs and paving tiles shall have a width of 4 mm, filled with 1-1 cement-sand mortar with one fifth hydrated lime and sufficient water to make the mixture plastic and easily smoothed and finished.

F. A grooving tool shall be used to produce a smooth semi-circular groove not more than 3 mm deep in all joints.

G. Precast Concrete Wheel Stoppers: Unless otherwise indicated on Drawings, secure wheel stops to the asphalt concrete surfaces using 19 mm diameter galvanized steel dowels embedded in precast units (minimum 2 dowels/unit). Grout dowels using the approved cementitious grout.

3.02 TOLERANCES

A. Curbs/Wheel stops: Laid to the lines and grades shown on Drawings with a tolerance of plus or minus 3 mm.

END OF SECTION