8_CLIN_007_Spec.pdf

G Mod Replace Concrete Curb Scope of Work

U.S. GENERAL SERVICES ADMINISTRATION, NORTHWEST/ARCTIC REGION 10

Section 1:

Project Location & Building Number:

Anchorage Federal Building and US Courthouse, Annex 222 W 8th Ave Anchorage, Alaska 99513

AK0032AA

Section 2:

Background:

The United States General Services Administration (GSA) requires action to demo and replace approximately 180 lineal feet (LF) of worn 6-inch concrete curb adjacent to building walkway at the Anchorage Federal Building (AFB) G Mod Annex. Existing curb ramp to remain in place. Reference attached A-1 Layout.

Section 3:

Work Hours:

Work hours for this exterior project are unrestricted. Tasks that create significant noise or vibrations must occur after normal business hours of 7:00 AM to 5:00 PM weekdays, except Federal holidays.

Section 4:

Parking/ Loading Dock/Storage

Contractor parking at the AFB is not available and is the responsibility of the Contractor.

Access to the loading dock requires written coordination with the GSA Project Manager at least 5 business days in advance.

Section 5:

General Information

1. All work shall comply with the versions of GSA’s PBS-P100, Facility Standards for the Public Buildings Service http://www.gsa.gov/portal/content/104821 and GSA Region 10 Fire Alarm Design, Installation and Testing Policy in effect at time of award.

2. Specific attention should be given to PBS P-100 Chapter One requirements including Laws, Regulations, Codes and Standards, and Key Sustainable Product requirements for carpet, interior paint, gyp board, ceiling tiles, and concrete.

3. Contractor shall provide all supplies, equipment, materials, services, and labor to perform the work.

4. Contractor shall be responsible for obtaining all necessary local, state, and federal permits, licenses, and clearances. Security clearances to work in the AFB (and annex) are the sole responsibility of the contractor, and no work is to be performed until all clearances are obtained.

5. Field Verification: All work dimensions, quantities, and locations shall be field verified by the contractor.

http://www.gsa.gov/portal/content/104821

GENERAL SERVICE ADMINISTRATION Region 10

Revision 0

6. Contractor Use of Premises: The Contractor shall coordinate with the GSA PM to arrange a schedule for site access during construction. The Contractor shall be authorized to use building restrooms.

7. Utilities: Contractor shall be authorized to use utilities during the course of this project. The contractor is responsible for making connections to the existing utility systems. Temporary electrical work shall meet the requirements of NFPA 70.

When temporary connections are removed, the Contractor is responsible for restoring existing utility services to their original condition.

8. Utility Outages and Locates: No utility outages will be approved without the written consent and approval of the GSA PM. Requests for utility outages shall be coordinated in writing at least 5 business days in advance with the GSA PM.

9. Protection of Public: The building site will continue to be used by tenants. The contractor shall fence, barricade, or otherwise block off the immediate work area to prevent unauthorized entry.

10. Housekeeping: The project site shall be kept in a neat, orderly, and safe condition at all times and all work areas shall be cleaned at the end of each work day. A final cleaning of the entire construction area will be required at substantial completion of the project. Final Cleaning to include (1) Removal of all tools, equipment, surplus material, and rubbish/debris; (2) Restore or refinish, to original condition, surfaces that are damaged due to the work of this contract; (3) Removal of grease, dirt, stains, foreign materials, and labels from finished surfaces; and (4) thoroughly clean building interiors.

11. Disposal: Ensure all waste materials and debris is disposed at an Alaska Department of Environmental Conservation (DEC) approved disposal site, in accordance with applicable environmental regulations. Unless otherwise specified, all material(s) removed becomes the property of the Contractor.

12. Painting/Staining: Painting/Staining shall be coordinated in writing with the GSA Project Manager in advance. The Contractor is responsible for using “low or no VOC” paints and stains.

13. Communications: Contractor project designee must be available to provide project status updates to GSA each work day.

Section 6:

Description:

Contractor shall provide all labor, materials and equipment necessary to complete the work below in accordance with (IAW) provided site plan.

• Prior to beginning work, the Contractor shall submit a construction schedule showing major milestones and significant site coordination events.

• Contractor shall verify all dimensions, paying special note to critical dimensions

• Provide and install barricades and signage to ensure MOA requirements, personnel safety, and project protection.

• Demo existing concrete curb as shown on Layout A-1.

• Prepare and compact sub-grade ensuring surface is within 1-inch (1”) of established grade after 95% compaction. Add crushed aggregate sub-grade

GENERAL SERVICE ADMINISTRATION Region 10

Revision 0 material as required.

• Provide and install formwork and moisture barrier per industry standard.

• Provide and install reinforcing bar (#4 or larger) no more than 12-inches O.C.

• Provide, place, and finish 4000 psi concrete. Trowel finish top surface, with a final fine broom finish parallel to curb. Provide control joints per industry standard.

• Provide and seal all construction joints with Sikaflex 1c SL or Contracting Officer approved equal.

• Provide moisture protection during times of inclement weather to protect the underlayment and concrete from moisture and damage. Concrete will not be placed during conditions subject to freezing weather.

• Protect finished concrete from damage until accepted by GSA Project Manager.

• Clean all surfaces affected by construction at end of each work day. Final clean at project completion.

Section 7:

Submittals

Submittals: Manufacturer’s product data, product samples and MSDS data sheets must be submitted to the Project Manager and Contracting Officer in the form of a submittal. Submittals verify design intent; however, approved submittals DO NOT automatically constitute a waiver to the contract document requirements. If a waiver or deviation from the contract document requirements is required the Contractor must submit a Request for Information (RFI) to the Contracting Officer. The Contracting Officer will determine if a waiver is permitted and respond to the RFI.

Submittals required by this contract are the following:

1. Construction schedule.

2. Product data/cut sheets.

Section 8:

Attachments

Attachments:

1. A-1 Layout.

2. A-2 Specification 033000.

END OF SCOPE

A-1 Layout - AFB Module G Curb Replacement

A-1 Layout - AFB Module G Curb Replacement

AutoCAD SHX Text appx 200 LF curbs shown in "Bold"

AutoCAD SHX Text 8th Ave

AutoCAD SHX Text

DN

AutoCAD SHX Text

DN

AutoCAD SHX Text C Street

AutoCAD SHX Text appx 200 LF curbs shown in "Bold"

AutoCAD SHX Text 8th Ave

REPLACE CONCRETE CURBS - ATTACHMENT 2 CAST-IN-PLACE CONCRETE

ANCHORAGE FEDERAL BUILDING, ANCHORAGE, AK SECTION 033000

SECTION 03300 – PAGE 1

PART 1 - GENERAL

1.01 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

1.02 SUMMARY

A. Cast-in-place concrete including the following:

1. Exterior Sidewalk slab-on-grade.

2. Exterior curbs.

1.03 SUBMITTALS – Not Used

1.04 REFERENCED DOCUMENTS

A. The publications listed below form a part of this Specification to the extent referenced. The publications are referred to in the text by the basic designation only.

B. ACI – American Concrete Institute:

1. ACI 301 – (1999) Standard Specification for Structural Concrete.

2. ACI 304 – (1989, R1997) Guide for Measuring, Mixing, Transporting and Placing Concrete.

3. ACI 306 – (1988) Cold Weather Concreting.

4. ACI 315 – (1992) Details and Detailing of Concrete

Reinforcement.

5. ACI 318 – (1999) Building Code Requirements for Structural

Concrete and Commentary.

6. ACI 347 – (1994) Guide to Formwork for Concrete.

C. ASTM – American Society for Testing and Materials:

1. ASTM A615 - (2001b) Standard Specification for Deformed and Plain Billet-Steel Bars for Concrete Reinforcement.

2. ASTM C31 - (2000e1) Standard Practice for Making and Curing Concrete Test Specimens in the Field.

3. ASTM C33 - (2002a) Standard Specification for Concrete Aggregates.

4. ASTM C39 - (2001) Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens.

5. ASTM C94 - (2000e2) Standard Specification for Ready-Mixed Concrete.

6. ASTM C143 - (2000) Standard Test Method for Slump of Hydraulic Cement Concrete.

7. ASTM C150 – (2002a) Standard Specification for Portland cement.

8. ASTM C171 - (1997a) Standard Specification for Sheet Materials for Curing Concrete.

9. ASTM C172 - (1999) Standard Practice for Sampling Freshly Mixed Concrete.

10. ASTM C173 - (2001e1) Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method.

11. ASTM C231 - (1997e1) Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method.

SECTION 03300 – PAGE 2

12. ASTM C260 - (2001) Standard Specification for Air-Entraining Admixtures for Concrete.

13. ASTM C309 - (1998a) Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete.

14. ASTM C494 - (1999ae1) Standard Specification for Chemical Admixtures for Concrete 99ae1 Standard Specification for Chemical Admixtures for Concrete.

15. ASTM C881 - (2002) Standard Specification for Epoxy-Resin- Base Bonding Systems for Concrete.

1.05 QUALITY ASSURANCE

A. Codes and Standards: Comply with provisions of the following codes, specifications, and standards, except where more stringent requirements are shown or specified:

1. American Concrete Institute (ACI) 301, "Specifications for

Structural Concrete for Buildings."

2. ACI 318, "Building Code Requirements for Reinforced

Concrete."

3. Concrete Reinforcing Steel Institute (CRSI) "Manual of

Standard Practice."

B. Materials and installed work may require testing and re-testing at any time during progress of work. Re-testing of rejected materials for installed Work shall be done at Contractor's expense.

PART 2 - PRODUCTS

2.01 FORM MATERIALS – Not Used

2.02 DOWLING (PINNING) MATERIALS

A. Reinforcing Bars: ASTM A 615, Grade 60, deformed.

2.03 CONCRETE MATERIALS

A. Portland cement: ASTM C 150, Type I.

1. Use one brand of cement throughout Project unless otherwise acceptable to Project Manager.

B. Normal-Weight Aggregates: ASTM C 33 and as specified. Provide aggregates from a single source for exposed concrete.

1. For exposed exterior surfaces, do not use fine or coarse aggregates that contain substances that cause spalling.

2. Local aggregates not complying with ASTM C 33 that have been shown to produce concrete of adequate strength and durability by special tests or actual service may be used when acceptable to Project Manager.

C. Water: Potable.

D. Admixtures, General: Provide concrete admixtures that contain not more than 0.1 percent chloride ions.

E. Air-Entraining Admixture: ASTM C 260, certified by manufacturer to

SECTION 03300 – PAGE 3

be compatible with other required admixtures.

F. Water-Reducing Admixture: ASTM C 494, Type A.

2.04 RELATED MATERIALS

A. Moisture-Retaining Cover: One of the following, complying with ASTM C 171, may be used for exposed concrete.

1. Waterproof paper.

2. Polyethylene film.

3. Polyethylene-coated burlap.

B. Bonding Agent: Polyvinyl acetate or acrylic base.

C. Epoxy Adhesive: ASTM C 881, two-component material suitable for use on dry or damp surfaces. Provide material type, grade, and class to suit Project requirements.

2.05 PROPORTIONING AND DESIGNING MIXES

A. Design mixes to provide normal weight concrete with the following properties as indicated on drawings and schedules:

1. 4000-psi, 28-day compressive strength; water-cement ratio,

0.45 maximum (air-entrained).

2.06 ADMIXTURES

A. Use water-reducing admixture in all concrete for placement and workability.

B. Use accelerating admixture in concrete slabs placed at ambient temperatures below 50 deg F (10 deg C).

C. Use air-entraining admixture in exterior exposed concrete. Add air-entraining admixture at manufacturer's prescribed rate to result in concrete at point of placement having total air content with a tolerance of plus or minus 1-1/2 percent within the following limits:

1. Concrete structures and slabs exposed to freezing and thawing, deicer chemicals, or hydraulic pressure:

a. 6.0 percent (severe exposure) for 1-inch maximum aggregate. Percentage of air-entrainment shall be measured at the point of placement.

D. Use admixtures for water reduction and set accelerating or retarding in strict compliance with manufacturer's directions.

2.07 CONCRETE MIXING

A. Ready-Mixed Concrete: Comply with requirements of ASTM C 94, and as specified.

PART 3 - EXECUTION

3.01 GENERAL

SECTION 03300 – PAGE 4

A. Coordinate the installation of joint materials and other related materials with placement of forms and reinforcing steel.

3.02 FORMS

A. General: Design, erect, support, brace, and maintain formwork to support vertical, lateral, static, and dynamic loads that might be applied until concrete structure can support such loads. Construct formwork so concrete members and structures are of correct size, shape, alignment, elevation, and position. Maintain formwork construction tolerances and surface irregularities complying with the following ACI 347 limits:

1. Provide Class A tolerances for concrete surfaces exposed to view.

B. Construct forms to sizes, shapes, lines, and dimensions shown and to obtain accurate alignment, location, grades, level, and plumb work in finished structures. Use selected materials to obtain required finishes. Solidly butt joints and provide backup at joints to prevent cement paste from leaking.

C. Fabricate forms for easy removal without hammering or prying against concrete surfaces. Provide crush plates or wrecking plates where stripping may damage cast concrete surfaces.

3.03 PLACING DOWELS

A. General: Comply with Concrete Reinforcing Steel Institute's recommended practice for "Placing Reinforcing Bars," for details and methods of reinforcement placement and supports and as specified.

3.04 JOINTS

A. Construction Joints: Locate and install construction joints so they do not impair strength or appearance of the structure, as acceptable to Project Manager.

B. Place construction joints perpendicular to main reinforcement.

Continue reinforcement across construction joints except as indicated otherwise. Do not continue reinforcement through sides of strip placements.

C. Use bonding agent on existing concrete surfaces that will be joined with fresh concrete.

D. Isolation Joints in Slabs-on-Grade: Construct isolation joints in slabs-on-grade at points of contact between slabs-on-grade and vertical surfaces, such as foundation walls or grade beams.

E. Contraction (Control) Joints in Slabs-on-Grade: Construct contraction joints in slabs-on-grade to form panels of patterns as indicated on drawings and to align with existing joints. Hand form joints 1/4 inch wide by one-fourth of slab depth or inserts 1/4 inch wide by one-fourth of slab depth, unless otherwise indicated.

SECTION 03300 – PAGE 5

3.05 PREPARING FORM SURFACES

A. General: Coat contact surfaces of forms with an approved, non-residual, low-VOC, form coating compound before placing reinforcement.

B. Do not allow excess form-coating material to accumulate in forms or come into contact with in-place concrete surfaces against which fresh concrete will be placed. Apply according to manufacturer's instructions.

3.06 CONCRETE PLACEMENT

A. Inspection: Before placing concrete, inspect and complete formwork installation and items to be embedded or cast in.

B. General: Comply with ACI 304, "Guide for Measuring, Mixing, Transporting, and Placing Concrete," and as specified.

C. Deposit concrete continuously or in layers of such thickness that no new concrete will be placed on concrete that has hardened sufficiently to cause seams or planes of weakness. If a section cannot be placed continuously, provide construction joints as specified. Deposit concrete to avoid segregation at its final location.

D. Placing Concrete Slabs: Deposit and consolidate concrete slabs in a continuous operation, within limits of construction joints, until completing placement of a panel or section.

1. Consolidate concrete during placement operations so that concrete is thoroughly worked around reinforcement, other embedded items and into corners.

2. Bring slab surfaces to correct level with a straightedge and strike off. Use bull floats or darbies to smooth surface free of humps or hollows. Do not disturb slab surfaces prior to beginning finishing operations.

E. Cold-Weather Placement: Comply with provisions of ACI 306 – Cold

Weather Concreting and as follows. Protect concrete work from physical damage or reduced strength that could be caused by frost, freezing actions, or low temperatures.

F. When air temperature has fallen to or is expected to fall below 40 deg F (4 deg C), uniformly heat water and aggregates before mixing to obtain a concrete mixture temperature of not less than 50 deg F (10 deg C) and not more than 80 deg F (27 deg C) at point of placement.

1. Do not use frozen materials or materials containing ice or snow. Do not place concrete on frozen subgrade or on subgrade containing frozen materials.

2. Do not use calcium chloride, salt, or other materials containing antifreeze agents or chemical accelerators unless otherwise accepted in mix designs.

3.07 MONOLITHIC SLAB FINISHES

A. Broom finish (where specified)

SECTION 03300 – PAGE 6

1. After trowel finish is complete, lightly fine broom over entire top surface in direction parallel to curb providing a slight rough texture.

B. Trowel finish (where specified)

1. Strike smooth tops of curbs and finish with a hand trowel over entire surface providing a smooth texture matching adjacent sections.

3.01 CONCRETE CURING AND PROTECTION

A. General: Protect freshly placed concrete from premature drying and excessive cold or hot temperatures. In hot, dry, and windy weather protect concrete from rapid moisture loss before and during finishing operations with an evaporation-control material. Apply according to manufacturer's instructions after screeding and bull floating, but before power floating and troweling.

B. Start initial curing as soon as free water has disappeared from concrete surface after placing and finishing. Weather permitting;

keep continuously moist for not less than 7 days.

C. Curing Methods: Cure concrete by curing compound.

D. Apply curing compound on exposed on exterior walks as follows:

1. Apply curing compound to concrete slabs as soon as final finishing operations are complete (within 2 hours and after surface water sheen has disappeared). Apply uniformly in continuous operation by power spray or roller according to manufacturer's directions. Re-coat areas subjected to heavy rainfall within 3 hours after initial application. Maintain continuity of coating and repair damage during curing period.

2. Use membrane curing compounds that will not affect surfaces to be covered with finish materials applied directly to concrete.

E. General: Formwork not supporting weight of concrete, such as sides of beams, walls, columns, and similar parts of the work, may be removed after cumulatively curing at not less than 50 deg F (10 deg C) for 24 hours after placing concrete, provided concrete is sufficiently hard to not be damaged by form-removal operations, and provided curing and protection operations are maintained.

3.02 CONCRETE SURFACE REPAIRS

A. Patching Defective Areas: Repair and patch defective areas with cement mortar immediately after removing forms, when acceptable to Project Manager.

B. Defective concrete slabs and sidewalk panels must be removed and replaced.

C. Perform structural repairs with prior approval of Project Manager for method and procedure, using specified epoxy adhesive and mortar.

SECTION 03300 – PAGE 7

D. Repair methods not specified above may be used, subject to acceptance of Project Manager.

END OF SECTION

1.05 QUALITY ASSURANCE