Revised_Spec_Section_321413_(Unit_Paving)_dated_3_June_2016.pdf

Albert V. Bryan U.S. Courthouse Perimeter Security Improvements June 3, 2016

SENSITIVE BUT UNCLASSIFIED (SBU)

PROPERTY OF THE UNITED STATES GOVERNMENT - FOR OFFICIAL USE ONLY

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Geier Brown Renfrow Architects, LLC | Carvalho & Good, PLLC Final Submission

SECTION 32 1413

UNIT PAVING

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Related Work Specified Elsewhere:

1. Division 3 Cast-in-Place-Concrete

2. Division 7 Waterproofing and Joint Sealants

1.2 DESCRIPTION

A. Furnish all labor, materials, tools, equipment, and services necessary for and reasonably incidental to complete the installation of unit paver types and applications as shown on the drawings, or specified including, but not limited to the following:

1. Concrete unit pavers on a sand setting bed on concrete slab.

2. Concrete unit pavers on a crushed stone bedding course.

3. Paver retaining units.

4. Paver spacers.

5. Geotextile Cloth

1.3 SUBMITTALS FOR PERMEABLE APPLICATION

A. Drawings and details: Indicate perimeter conditions, junction with other materials, expansion and control joints. Indicate layout, pattern, and relationship of paving joints to fixtures and project formed details.

B. Minimum 3 lb samples of bedding aggregate and materials.

C. Sieve analysis of aggregate for bedding materials per ASTM C 136.

D. Soils report indicating density test reports, classification, and infiltration rate measured on-site under compacted conditions, and suitability for the intended project.

E. Paver Installation Subcontractor:

1. Job references from projects of a similar size and complexity. Provide Owner/

Client/ General Contractor names, postal address, phone, fax, and email address.

2. Written Method Statement and Quality Control Plan that describes material

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staging and flow, paving direction and installation procedures, including representative reporting forms the ensure conformance to the project specifications.

1.4 QUALITY ASSURANCE

A. Materials and methods of construction shall comply with the following standards:

1. National Concrete Masonry Association (NCMA).

2. American Society of Testing and Material (ASTM).

3. American Association of State and Highway Transportation Officials

(AASHTO).

B. Installation performed only by a skilled workman with satisfactory record of performance, minimum of five years of experience on at least three installations similar in type, size, and quality to that of this project.

C. Sample Panel Installation:

1. Prior to starting installation of pavers, provide sample panels of each pavement type and application using materials, patterns, anchors and/or pedestals, joint treatments indicated on the drawings including special features of expansion joints and contiguous work. The panel can be a part of the actual paving. Build sample panels at the project site of full thickness and approximately 6’ x 6’, unless otherwise indicated.

Provide the range of color, texture, and workmanship to be expected in the completed work.

2. Correct and rebuild sample panels until Architect’s acceptance of work.

Retain accepted panels during the entire construction as a standard for completed pavement. Do not remove or destroy panel until construction is complete.

3. Build panel and apply sealant primers and sealant compounds in sufficient time to allow for final test for staining or other deleterious effects from such applications.

1.5 SUBMITTALS

A. Manufacturer’s Data:

1. Submit manufacturer’s specifications and other technical data for each proprietary material, including certification that each complies with the specified requirements. Include instructions for storage, installation, and protection.

Indicate that installer has received a copy of each instruction

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B. Samples:

1. Submit 3 full size samples of each paver required. Include in each set the full range of color and texture to be expected in the completed work. Architect’s review will be for color and texture only. Compliance with all other requirements is the exclusive responsibility of the Contractor.

C. Submit material certificate for base and bedding materials.

D. Maintenance Instructions

1. Submit recommended cleaning and maintenance instructions for the pavers being provided.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Deliver materials to the project site in undamaged condition.

B. Protect pavers during storage and construction against wetting, soiling, staining, and damage.

C. Handle pavers to prevent chipping, breakage, soiling or other damage. Do not use pinch or wrecking bars without protecting edges of pavers with wood or other rigid materials.

Lift with wide belt-type slings wherever possible; do not use wire rope or rope containing tar or other substances which might cause staining. If required, use wood rollers and provide cushion at end of wood slides.

D. Store pavers on wood skids or pallets, covered with non-staining waterproof membrane.

Place and stack skids and pavers to distribute weight evenly and to prevent breakage or cracking of units. Protect stored pavers from weather with waterproof, non-staining covers or closures, but allow air to circulate around pavers.

E. Deliver, store and handle masonry accessories to prevent weather damage and deterioration.

1.7 PROJECT CONDITIONS

A. Review installation procedures and coordinate paving work with other work affected by the paver work.

B. Identify and protect geotextile cloth and soil separator during placement of pavement.

Do not allow pavement installation to penetrate or disturb geotextile cloth or soil separator at any time of installation of pavement.

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C. Weather Limitations:

1. Protect pavement from freezing when ambient temperature is 40 degrees F and falling. Heat materials and provide temporary protection of completed portions of pavement work. Comply with requirements of International Masonry

All-Weather Council’s “Guide Specification for Cold Weather Masonry

Construction”, Section 04200, Article 3.

2. Do not use frozen materials or materials mixed with or coated with ice or frost.

4. During all seasons, protect partially completed pavement against weather when work is not in progress. Cover pavement with strong waterproof, non-staining membrane extending at least 2’ on all sides and anchor securely in place.

D. Protect adjacent work from damage, soiling, or staining during paving operations.

E. Provide temporary barricades and warning lights as required for protection of project work and public safety.

PART 2 - PRODUCTS

2.1 PAVERS

A. Pavers shall be as called out or shown on schedules and the drawings.

B. Provide only sound units free of defects that would interfere with proper placing of pavers or impair strength or permanence of construction. Minor cracks and minor chipping incidental to handling in shipment and delivery will be acceptable subject to

Architect’s review and acceptance. Pavers with excessive cracks will be rejected as not complying with specification requirements.

C. Do not change source of pavers during the course of work to ensure consistent color range and textures.

2.3 CONCRETE PAVER CLEANER

A. Efflorescence Remover and General Cleaner™ as manufactured by ADDIMENT Inc., Doraville, GA (404-446-6250).

2.4 CONCRETE BASE

A. Conform to applicable sections of Division 3.

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2.5 CRUSHED STONE FILLER AND BASE (FOR PERMEABLE PAVER APPLICATIONS)

A. Crushed stone with 90% fractured faces, LA Abrasion <40 per ASTM C 131, minimum

CBR of 80% per ASTM D 1883.

B. Do not use rounded river gravel.

C. All stone materials shall be washed with less than 1% passing the No. 200 sieve.

D. Joint/opening filler and bedding: conforming to ASTM D 448 gradation as shown in

Tables 1 & 2 below:

Table 1

ASTM No. 8 Grading Requirements

Bedding and Joint/Opening Filler

Sieve Size Percent Passing

12.5 mm (1/2 in.) 100

9.5 mm (3/8 in.) 85 to 100

4.75 mm (No. 4) 10 to 30

2.36 mm (No. 8) 0 to 10

1.16 mm (No. 16) 0 to 5

2.6 PAVER SPACER TABS (FOR PERMEABLE PAVER APPLICATIONS)

A. ‘Enviropave Paver Spacers’, Prior Lake Minnesota, 55372

612-226-6400, or approved equal.

1. Spacer thickness as shown on plans.

2.7 GEOTEXTILE CLOTH

A. US Fabrics, Inc., Cincinnati OH, 45227

800-518-2290

US 100 NW Nonwoven Geotextile, or approved equal.

PART 3 _ EXECUTION

3.1 INSPECTION

A. Examine substrate and installation conditions of related trades and verify that all such work is complete and satisfactory. In the event of a discrepancy, notify the Architect.

Do not start pavement work until unsatisfactory conditions are corrected.

B. Protect and maintain geotextile cloth and soil separator during entire pavement application.

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3.2 PREPARATION

A. Clean pavers before setting by scrubbing with fiber brushes followed by a thorough drenching with clean water. Use only mild cleaning compounds that do not contain caustic or harsh fillers or abrasives in accordance with fabricator’s instructions.

B. Verify that the soil subgrade is free from standing water.

C. For Permeable Paver application: Stockpile joint/opening filler, base and subbase materials such that they are free from standing water, uniformly graded, free of any organic material or sediment, debris, and ready for placement.

3.5 INSTALLATION OF PAVERS

A. Set pavers in patterns indicated on the drawings, utilizing full range of pavers with level surface and uniform joints of widths indicated, or as pattern requires. If not indicated, as directed by the Architect.

B. Cut pavers when necessary with motor-driven saw equipped with a diamond blade designed to cut masonry with clean, sharp unchipped edges. Cut pavers as required to provide pattern shown on the drawings and to fit adjoining work neatly. Use full pavers without cutting wherever possible. Where cutting is required, use the largest size paver possible. Avoid use of small pieces of pavers or large joint spaces. Where paver pieces used are less than 1/3 of a full size unit, adhere the cut piece to the adjacent unit using paver adhesive. Maintain joint width.

C. Set pavers in patterns indicated on the drawings.

D. Fill gaps at the edge of the paved surface with standard pieces or with pavers cut to fit with a motor-driven saw. Provide cut units with straight cut surfaces, free from cracks or chips. Where paver pieces used are less than 1/3 of a full size unit, adhere the cut piece to the adjacent unit using paver adhesive. Maintain joint width.

E. Placing Pavers:

1. Place pavers carefully by hand in straight courses maintaining accurate alignment and uniform top surface. Protect newly laid pavers with panels of plywood on which workers stand. Advance protective panels as work progresses but maintain protection in areas subject to continued movement of materials and equipment, to avoid creating depressions or disrupting alignment of pavers.

G. Tolerances:

1. Do not exceed 1/16” unit to unit offset from flush, and a tolerance of 1/8” in

2’-0” and ¼” in 10’-0” from level or slope as indicated for finished surfaces of

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paving. Remove and re-install any pavers or areas of pavement which do not meet finish grade tolerances indicated above.

2. Where pavers abut vertical surfaces or where a paver type and/or color change occurs, paver edges shall align to produce a consistent line.

3. Paver spacing: see drawings for spacing in different paver applications.

3.6 INSTALLATION OF PERMEABLE PAVERS

A. General

1. Any excess thickness of soil applied over the excavated soil subgrade to trap sediment from adjacent construction activities shall be removed before application of the geotextile material.

2. Keep area where pavement is to be constructed free from sediment during entire job.

Geotextile and bedding materials contaminated with sediment shall be removed and replaced with clean materials.

B. Geotextiles

1. Place on bottom and sides of soil subgrade. Secure in place.

2. Overlap a minimum of 12 inches, 24 inches in the direction of drainage.

C. Bedding Layer

1. Moisten, spread and screed No. 8 stone bedding material.

2. Fill voids left by removed screed rails with No. 8 stone.

3. The surface tolerance of the screeded No. 8 bedding layer shall be +/- 3/8 inch over a 10 ft straightedge.

4. Do not subject screeded bedding material to any pedestrian or vehicular traffic before paving unit installation begins.

D. Concrete Pavers and Joint/ Opening Fill Material

1. Lay the paver in the patterns and joint widths shown on the drawings. Maintain straight pattern lines. Use paver spacers to maintain a consistent joint width of

3/8” thick.

2. Fill gaps at the edges of the paved area with cut units.

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3. Cut pavers and place along the edges with a masonry saw.

4. Fill the openings and joints with No. 9 stone.

5. Remove excess aggregate on the surface by sweeping pavers clean.

6. Compact and seat the pavers into the bedding material using a low-amplitude, 75-90

Hz plate compactor capable of at least 4,000 lbs centrifugal compaction force.

This will require at least two passes with the plate compactor.

7. Do not compact within 6 ft of the unrestrained edges of the paving units.

8. Apply additional aggregate to the openings and joints, filling them completely.

Remove excess aggregate by sweeping then compact the pavers. This will require at least two passes with the place compactor.

9. All pavers within 6 ft of the laying face must be left fully compacted at the completion of each day.

10. The final surface tolerance of compacted pavers shall not deviate more than +/- 3/8 inch under a 10 ft long straightedge.

11. The surface elevation of pavers shall be 1/8 to ¼ inch above adjacent drainage inlets, concrete collars or channels.

3.7 FIELD QUALITY CONTROL OF PERMEABLE PAVER APPLICATION

A. After sweeping the surface clean, check final elevations for conformance to the drawings.

B. Lippage: No greater than 1/8 inch difference in height between adjacent pavers.

C. The surface elevation of pavers shall be 1/8 to ¼ inch above adjacent drainage inlets, concrete collars or channels.

3.8 PROTECTION

A. Restrict traffic from pavement surfaces during setting of pavers and until completion of installation.

B. Installer shall advise Contractor of proper procedures required to protect pavers from collapse, deterioration, discoloration or damage during construction.

C. Protect pavers from damage until final acceptance.

D. After permeable paver installation is complete, the General Contractor shall be responsible for protecting work from sediment deposition and damage due to subsequent

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construction activity on the site.

3.9 REPAIR AND CLEANING

A. Remove and replace pavers which are broken, chipped, stained or otherwise damaged.

Provide new matching pavers, install as specified.

B. Cleaning:

1. Remove excess materials from exposed pavement surfaces, wash and scrub clean.

2. Apply paver cleaner per manufacturer’s recommendations.

3. If staining material cannot be removed, replace stained pavers(s) with new pavers.

D. Upon completion of work, remove from site all excess materials, debris, and equipment.

Repair damage resulting from paving operations.

END OF SECTION