(SOW) ZFW CTRB Exterior Stair Addition.pdf

October 7, 2024

ZFW NASA BUILDING EXTERIOR STAIRS ADDITION

JCN 24002872

STATEMENT OF WORK

ZFW NASA BUILDING EXTERIOR STAIRS ADDITION

ZFW ARTCC

September 30, 2024

U.S. DEPARTMENT OF TRANSPORTATION

FEDERAL AVIATION ADMINISTRATION

TABLE OF CONTENTS

SECTION 1A – GENERAL REQUIREMENTS

SECTION 1B – SPECIAL REQUIREMENTS

SECTION 1C – HIGH LEVEL SCOPE OF WORK

SECTION 1D – DRAWING EXHIBIT

SECTION 2 – PROJECT SPECIFICATIONS

SECTION 03 10 00 – CONCRETE FORMING AND ACCESSORIES

SECTION 03 20 00 – CONCRETE REINFORCING

SECTION 03 30 00 – CAST-IN-PLACE CONCRETE

SECTION 05 51 36 – PREFABRICATED ALUMINUM STAIRS AND PLATFORMS

SECTION 26 05 26 – GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS

SECTION 31 00 00 – EARTH WORK

mailto:christopher.birch@faa.gov mailto:Stephen.Holder@faa.gov

JCN 24002872

SECTION 1A – GENERAL REQUIREMENTS

1A.1 Summary of Work.

The Contractor is required to furnish all labor, materials, services, equipment, tools, and insurance to add an external staircase on the east end of the south wall of the NASA/FAA NTX ATM Research Station (NASA

Building) at the Fort Worth Air Route Traffic Control Center (ZFW ARTCC) located at 13800 FAA Blvd, Fort Worth, TX 76155. This will include procurement of a new 12-foot floor-to-floor height, 45° angle of rise, heavy duty aluminum, stair section with handrails and 36” wide I-bar grating stair treads and an exit-right top landing, installation of reinforced concrete landing and steps at the base and a concrete pad (or piers) to support the stair section and top platform support posts, modifications of the existing safety rails system attached to the building parapet, and procurement and installation of steps/stairs on the inside of the parapet wall.

A contractor site walk-through is encouraged prior to bid proposal preparation.

Advise that the ARTCC will remain operational 24/7 during all project work. The work performed will not impact AT operations as construction activity will be coordinated via a pre-construction meeting, either in person or virtual, which is to be conducted a minimum of two weeks prior to the scheduled start of construction. At the time of the pre-construction meeting a complete construction schedule is to be submitted.

1A.2 Background.

The current means of accessing the roof of the ZFW NASA building is to climb a vertical interior ladder and exit through a roof hatch. It can be very difficult for a FAA technician to ascend this ladder with tools and/or parts and manage opening the hatch.

1A.3 Action Plan.

This project will provide for the addition of an exterior OSHA compliant stair system and landing to provide a safer means of roof access to perform regularly required maintenance activities.

END OF SECTION 1A

JCN 24002872

SECTION 1B – SPECIAL REQUIREMENTS

1B.1 Coordination.

1. All contracts between the contractor and ZFW ARTCC shall be coordinated through the FAA’s designated Contracting Officer (CO).

2. All work performed and all materials and equipment used must be approved by the CO. This shall include, but is not limited to, testing, inspection, scheduling, reporting, and submittals.

3. Contractor shall be always escorted by ZFW ARTCC designated FAA Contracting Officer

Representative (COR) or Point of Contact (POC) and/or Technicians.

4. Immediately on discovery of the need for additional information or interpretation of the contract documents, contractor shall prepare and submit an RFI (Request for Information) in the form specified to the designated FAA COR/POC and/or Technicians.

5. Air Traffic Control Safety: Contractor shall perform all work in a manner which does not conflict with, or adversely affect, the air traffic operational environment. In the event of any actual or potential conflicts, air traffic activities shall have priority over all construction activities.

6. All work must be accomplished by experienced workers in accordance with the highest standards of the various work trades involved. Workers must abide by safety requirements, set forth by OSHA, that correspond to the type of work being performed.

7. Restroom facilities are not available on site. Temporary facilities shall be provided by the contractor as required to meet the needs of the workers.

8. Contractor shall coordinate with FAA Technicians to locate the appropriate shutoff valve upstream from the irrigation system backflow preventer isolation valve and turn off flow.

9. Contractor must supply adequate waste disposal dumpster on project site for all waste associated with project.

1B.2 Pre-Construction Conference.

As soon as practical after the award of the contract, the Contracting Officer will set a date for a preconstruction conference between the representatives of the Government (applicable ZFW managers and personnel will be invited to attend) and the contractor. This conference will be either virtual or at a location agreed upon by the

CO and the contractor. The contractor shall attend the conference and shall abide by all agreements reached at the conference regarding:

1. Detailed procedures for administration of the project.

2. Identity of the ZFW COR/POC and/or Technicians, authorized representatives of the

Government/Contracting Officer, and the contractor’s superintendent(s).

3. Exchange of telephone numbers and email information.

4. Detailed procedures for submittals:

a. Contractor shall submit list of materials for FAA approval prior to the commencement of construction.

b. In making a formal request for substitution, the contractor represents that they have investigated the proposed product and have determined that it is equal to or superior in all respects to that specified.

c. Contractor shall submit a construction schedule which shall be approved by FAA prior to construction.

d. Operations and Maintenance (O & M) Manuals: Contractor shall submit all applicable manufacturer’s O & M manuals.

e. Contractor shall allow up to 10 days for submittal review. A resubmittal would require additional time. No extension of the contract time will be authorized because of failure to transmit submittals enough in advance of the work to permit processing, including resubmittals.

f. Procurement Before Approval: The contractor is advised not to procure any item for which submittal approval is required but not yet granted. If approval is denied, the contractor will be prevented from installing the disapproved item(s). The contractor must transmit a new submittal package for the new items replacing the disapproved items and must procure only approved items. The contractor shall take responsibility for the delivery and installation of any items installed before submittal approval is granted. The FAA reserves the right to discontinue field work on any item furnished without submittal approval. Procuring and/or installing material which is later disapproved could result in substantial losses of money and time for the contractor.

5. Available storage areas for contractor’s materials and equipment.

6. Compliance with FAA safety practices, orders, general operating procedures, and security regulations.

7. Availability of onsite power for use by the contractor as determined by the FAA COR/POC and/or

Technicians.

8. The FAA Pre-Construction and Maintenance Project Safety and Health Checklist, form 3900-18, will be reviewed and filled out during the meeting.

9. Any additional subjects discussed pertinent to the contract.

1B.3 Product Requirements.

1. Deliver, store, and handle products using means and methods that will prevent damage, deterioration, and loss, including theft and vandalism. Comply with manufacturer's written instructions.

2. Delivery and Handling:

a. Schedule delivery to minimize long-term storage at Project site and to prevent overcrowding of construction spaces.

b. Deliver products to Project site in an undamaged condition in manufacturer's original sealed container or other packaging system, complete with labels and instructions for handling, storing, unpacking, protecting, and installing.

c. Inspect products on delivery to determine compliance with the Contract Documents and to determine that products are undamaged and properly protected.

3. Storage:

a. Store products to allow for inspection and measurement of quantity or counting of units.

b. Store materials in a manner that will not endanger Project structure.

c. Comply with product manufacturer's written instructions for temperature, humidity, ventilation, and weather-protection requirements for storage.

d. Provide a secure location and enclosure at Project site for storage of materials and equipment by Owner's construction forces. Coordinate location with Owner.

1B.4 Working Hours.

1. All work hours will be dependent on impact to NAS facilities and locations throughout the ARTCC.

2. Work shall be generally performed during normal business working house of 7:00AM to 5:00PM, Monday through Friday, except otherwise indicated.

3. The start and stop time shall typically be coordinated with the schedules of the FAA COR/POC and/or

Technicians to minimize or prevent the need for overtime work by FAA personnel.

1B.5 Ingress and Egress to Work Area.

The FAA POC and/or Technicians shall direct all ingress and egress to the work area. Security precautions against unauthorized facility entrance will be maintained. Contractor personnel shall be escorted at all times upon entry through the security gate by FAA COR/POC and/or Technicians.

1B.6 Security Requirements.

1. Security Guard: Contractor must use the existing guard house on the north entrance to the facility to check in prior to starting work for the day. The FAA COR/POC and/or Technicians will meet the contractor at the guard house to provide escort into the facility.

2. Personnel List: Contractor must provide the FAA COR/POC with a list of contractor's personnel who will require access to the site within twenty-four (24) hours of arrival to site. The list must be kept current during project duration.

3. Security Investigation and Identification: Contractor's personnel may be subject to security investigation by FAA. Upon request by the CO, the contractor must promptly complete all security forms provided by the CO. If Contractor's personnel do not hold a “yellow” security badge or a contractor PIV card, then they must report to the FAA security guard at entrance to the facility and submit proper identification when signing in to obtain a “red” FAA visitor badge which will be always worn on an outside garment while on the facility premises. This badge must be returned daily to the security guard when leaving the premises, unless otherwise noted.

4. Vehicle Identification: Contractors and contractor's employees' vehicles must park as designated in the staging plans or as directed by the FAA COR/POC.

5. Escort Requirement: Contractor's personnel will always be escorted by FAA POC and/or

Technicians during the project. Contractor's personnel shall not violate any security regulations pertaining to the ARTCC facility.

6. Right to Search: Current procedures at FAA facilities include the "right to search." If in the judgment of the FAA a cause to search a vehicle or the person of personnel exists, such search will be made.

7. Prohibited Items:

a. Weapons. ABSOLUTELY NO WEAPONS in any way, shape, or form are allowed on the job site, facility premises, or inside contractor vehicles (company or personally owned).

This includes ammo, ammo casings, empty cartridges, etc... Any weapons found by

Security guards, (Refer to No. 6: Right to Search), may be subject to confiscation. Security guards also reserve the right to contact local law enforcement and/or Homeland Security.

Contractor will then be banned for life from any access to the ZFW facility.

b. Other Projectile Weapons. This category includes items such as compressed air guns, flare guns, spear guns, stun guns, realistic replica or toy firearms and other electric weapons, ammunition, and slingshots.

c. Bladed, Edged, or Sharp Tools or Implements. This category includes items such as axes or hatchets, bows and arrows, ice axes, and martial arts weapons. It also includes bladed devices with a blade of 2½ inches or more and all straight razors excluding safety razors.

i. Exception: tools of the trade

d. Club-like Items and Striking Devices. This category includes items such as Billy clubs, night sticks, blackjacks, brass knuckles, and chains in excess of 12 inches (jewelry exceptions can be made).

e. Destructive Devices, Explosives or Combustible Chemical Compounds or Mixtures. This category includes items such as blasting caps, detonators, dynamite, fireworks, gunpowder, hand grenades, plastic explosives, realistic replicas of explosives or other devices, gas torches, and flammable liquids. Disabling Chemicals and Other Dangerous Items. This category includes items such as mace, pepper spray, tear gas or other chemical spray, spillable batteries except those in wheelchairs and similar devices, spray paint, and poisonous gases.

f. Controlled Items. Controlled items are those items that may be otherwise prohibited but are

“tools of the trade” and “sporting equipment” that are considered potentially dangerous.

FAA personnel may possess controlled items on federal property. Government-furnished items are authorized within facilities. Personal items are allowed within a facility if the item is necessary to perform a mission or maintenance operation (e.g., saws, screwdrivers) and its need is sanctioned by the FM or designee. Otherwise, personal items must remain in personal vehicles.

i. Bladed, Edged, or Sharp Weapons. This category includes items such as saws

(including cordless, portable power saws), metal scissors with pointed tips, screw drivers (except eyeglass repair kits), drills (including portable power drills) and tools including wrenches, pliers, and folding utility tools.

ii. Club-like Items and Striking Devices. This category includes items such as hammers, crowbars, baseball/softball bats, golf clubs, hockey sticks, lacrosse sticks, pool cues, and ski poles.

iii. Destructive Devices, Explosives, or Combustible Chemical Compounds and

Mixtures. This category includes items such as flares, gasoline, and aerosol sprays.

iv. Disabling Chemicals and Other Dangerous Items. This category includes items such as chlorine and bleach, compressed gas cylinders (including fire extinguishers), and toxic industrial chemicals or materials.

g. Drugs/ Drug Paraphernalia

h. Alcohol/ Alcohol Container (full or empty)

1B.7 Property Damage.

The contractor shall take all precautions to avoid damage to Government property or equipment (existing and new). Any damage to Government property or equipment by the contractor shall be repaired by the contractor to its original state or better condition at no additional expense to the Government. After notice to proceed and prior to the commencement of construction, the contractor and FAA COR/POC shall conduct joint inspections of the existing areas affected by the construction. Existing damage or defects shall be noted and will be used as the basis for determination of damages caused by the contractor's operations.

1B.8 Parking of Contractor Vehicles.

All personnel will park their vehicles in pre-designated areas as authorized by the FAA COR/POC and/or

Technicians. Materials and tools may be off-loaded at the work site by arrangements with the FAA COR/POC and/or Technicians. Access to all employee parking areas must be kept unobstructed. If temporary access obstruction is unavoidable, the contractor must advise the FAA COR/POC immediately.

1B.9 Storage of Materials.

The contractor shall store all materials in a manner to protect them from all elements of the weather. Storage of reasonable quantities of material, supplies and tools on site is permissible providing the FAA COR/POC and/or Technicians authorizes the location. The FAA is not responsible for the security of the materials, supplies and tools owned by the contractor.

JCN 24002872

1B.10 Site Visit.

The contractor shall take steps necessary to ascertain the nature of the work and satisfy themselves to the conditions that can affect the work. The site visit shall include verifying field measurements and conditions. No subsequent extras will be allowed due to any claim of lack of knowledge for conditions that can be determined by examining the site. Errors, inconsistencies, or omissions discovered shall be reported to the contracting officer. Site visits can be arranged by contacting the facility.

1B.11 Compliance with Local Codes and Other Codes.

The contractor shall comply with local and other codes of standard trade practices adopted by these contract documents. Where the requirements of the specifications exceed those of the local and adapted codes, the contractor shall comply with the requirements of the specifications.

1B.12 Fire Protection.

The contractor shall have an equivalent of two 20 lb. Class A, B and D fire extinguishers in the work area through the progress of the job.

1B.13 Cleaning.

The contractor shall keep the working area in a clean and proper condition. All rubbish and waste resulting from the execution of the work shall be removed at the end of each day. Contractor must supply adequate waste disposal dumpster on project site for all waste associated with project or be prepared to haul waste and debris off site at the end of each day. Immediately after unpacking, all packing materials shall be removed from the building and the premises. Upon completion of work and before final inspection, the contractor shall remove his/her working tools, equipment, debris, rubbish, and unused materials from the building site. Disposal of rubbish and debris will be off site and at no additional cost to the FAA or as directed by the FAA COR/POC and/or Technicians.

1B.14 Non-interference with Existing Facility Operations.

The access to the facility shall be always kept unobstructed. If any interference with the existing facility operation or access seems to be unavoidable, the contractor shall advise the contracting officer through the RE/COR and/or Technicians 72 hours before such interference. FAA reserves the right to stop work at any time if the operation of this facility is jeopardized by the contractor’s work. This facility maintains air traffic control without shutdown. Various techniques are employed to achieve maximum system availability. Mechanical and electrical systems in direct support of air traffic operation and environmental systems have redundant configurations. Shutdown of equipment shall be scheduled with the FAA COR/POC and/or Technicians at least 72 hours prior to the control systems installer’s need. The reliability of mechanical and electrical systems is compromised when redundant equipment is not available.

Every effort will be made by the FAA to allow work to be accomplished during the installer’s working hours. FAA personnel shall accomplish equipment shutdown.

1B.15 Other Contracts.

The Government may undertake other contracts for additional work at or near the site of the work under this contract. The contractor shall fully cooperate with other contractors and with the Government employees and shall adapt scheduling and performing the work under this contract to accommodate the other work.

The contractor shall not commit or permit any act that will interfere with performance of work by any other contractor or by Government employees.

1B.16 Contractor’s Liability.

Damage to the existing facility or equipment caused by the contractor shall be immediately reported to the

FAA POC and/or Technicians immediately. The contractor shall be responsible for repairing or having repaired all damaged areas of the facility or equipment directly caused by contractor related work. All repairs shall be accomplished, without delay, at the contractor’s expense to the satisfaction of the FAA COR/POC and/or Technicians.

1B.17 Permits.

The contractor shall be responsible for obtaining all state, city, county, etc. permits, if required, to complete the project, at no additional cost to the Government.

1B.18 Material.

All equipment, material, and articles incorporated into the work covered by this contract shall be new and of the most suitable grade for the purpose intended, unless otherwise specifically provided in this contract.

References in the specifications to material, articles, or patented processes by trade name, make, or catalog number, shall be regarded as establishing a standard of quality and shall not be construed as limiting competition. The contractor may, at his option, use any equipment, material, article, or process that, in the judgment of the FAA COR/POC and/or Technicians, is equal to that named in the specifications, unless otherwise specifically provided in this contract.

1B.19 Workmanship.

The contract shall be accomplished by workers experienced in each trade in accordance with the highest standards of the various trades involved. The FAA COR/POC and/or Technicians must approve all details to assure the professional and complete project, whether stated in the specifications or not. The COR/POC and/or Technicians may require, in writing, that the contractor will remove from the work site any employee the FAA COR/POC and/or Technicians deems incompetent, careless, or otherwise objectionable.

1B.20 Superintendence by the Contractor.

At all times during the performance of this contract and until the work is completed and accepted, the contractor shall directly superintend the work on site or assign and have on site a competent superintendent who is satisfactory to the FAA COR/POC and/or Technicians and has the authority to act for the contractor.

1B.21 Safety.

The safety of the FAA personnel is of UTMOST importance. Contractor MUST ensure that all construction debris, tools, and materials are out of reach or stored in an adequate locked box when contractor is not present or working. The job site/construction area MUST be always kept clean.

END OF SECTION 1B

SECTION 1C – HIGH LEVEL SCOPE OF WORK

Pictures: Existing Conditions – South Side of ZFW NASA Building, Railing, Planter Area

Fort Worth ARTCC: NASA Building Exterior Stairs Addition

The Contractor shall provide all labor, materials, and equipment in accordance with the contract provisions and specifications included herein. The work shall include, but is not limited to, the following:

1. Purchase and deliver a new 12-foot floor-to-floor height, 45° angle of rise, heavy duty aluminum, stair section with handrails and 36” wide I-bar grating stair treads and an exit-right top landing.

Recommended stair and landing model numbers are LND-ER-AL36144 and 017S36140-AL by FS

Industries. Equivalent stair and landing meeting the requirements of OSHA standard 1910.25 may be submitted for evaluation.

2. Install a 54” x 54” x 12” reinforced concrete pad to support the stair and platform support posts.

Contractor to obtain confirmation from material supplier the adequateness of the pad size and size of reinforcement.

3. Install a reinforced concrete landing and steps at base of staircase. Concrete landing to be minimum

42” wide x 48” long x 34” high with four steps, each having a 7” rise and 11” run. A set of OSHA compliant metal handrails shall be installed on each side of the stairs and landing.

4. Contractor shall take field measurements to confirm exact height above grade required for the concrete landing to ensure the 12-foot stair section and top platform will align properly with the top of the parapet.

5. Concrete shall have a mix design to provide a minimum 3500 psi, 28-day compressive strength.

Contractor shall employ a third-party testing firm to perform sampling when concrete is placed and provide 7-day and 28-day compressive breaking strength test results.

6. Excavations around identified utilities shall be performed by hand digging or other means such as vacuum or hydro excavating. FAA onsite personnel will aid in identification of know utilities.

7. Prepared subgrade below concrete shall have the top 12 inches compacted to 95% maximum dry density. Contractor shall employ a third-party testing firm to perform testing per standard ASTM

D6938 prior to placement of concrete.

8. Contractor shall install the new 12-foot stair section, top platform & support posts, stair treads, and handrails as per the manufacturer’s instructions. All installation hardware shall be stainless steel and torqued to manufacturer’s specifications.

9. Assembled stair section, platform, and handrails shall be inspected for burrs and sanded/ground smooth, as required.

10. The existing rail system attached to the building parapet is to be modified as to allow for the opening from the new platform. Any new railing required for this modification much match existing material type and diameter. Any new railing must be attached to the lightning protection system to match existing installation.

11. Contractor shall provide and install either a custom or pre-manufactured metal stair/steps on the inside of the 20” high parapet wall. The stair/steps are to be fastened to the roof by a non-penetrating means, such as glue or epoxy. A protective rubber mat is to be placed between the stair/steps and the roof surface.

12. Provide applicable O & M manuals and warrantee documentation.

END OF SECTION 1C

SECTION 1D – DRAWING EXHIBIT

SOUTH PARAPET AND RAILING ELEVATION

SCALE: 1" = 5'-0"

CONTRACTOR TO MODIFY EXISTING HAND

RAILS TO ADD OPENING FOR PLATFORM

1" = 5'-0"

5' 5' 10'

14'-6"

N

REINFORCED CONCRETE

LANDING & STEPS

(from top of slab to top of parapet)

NN

18'-9"

2'-5" 1'-6"

(distance to vent pipe)

'-0

4" x 4" SECTIONAL

SUPPORT POST

(TYP. OF 4)

CONTRACTOR TO MODIFY

EXISTING HAND RAILS TO ADD

OPENING FOR PLATFORM

17'-3 1/2" 3'-6"

12'-7"

18'-4"

54" x 54" x 12"

REINFORCED

CONCRETE PAD

8" x 8" BASEPLATE

(TYPICAL OF 8)

'-5

3' -0

NASA / FAA NTX ATM RESEARCH STATION - SOUTH ELEVATION

SCALE: 1" = 5'-0"

3'-10"

20" H x 36" W STAIRS

21'-5"

2'-6"

TRANSFORMER

VENT PIPE

& EF-1

17'-3 1/2"

2' -7

/2

4' -1

/2

12'-7"

0'-10"

3'-0"

1'-8"

18'-4" 18'-9"

12'-0"

2'-10" 0'-7"

0'-11"

3'-0"

4'-0"

1'-2"

7'-10"

20"

CONTRACTOR TO

HYDROEXCAVATE AROUND

EXISTING UTILITIES

END OF SECTION 1D

SECTION 2 – PROJECT SPECIFICATIONS

SECTION 03 10 00 - CONCRETE FORMING AND ACCESSORIES

PART 1 GENERAL

1.1 SUMMARY

This Section specifies form-facing material for cast-in-place concrete.

1.2 DEFINITIONS

A. Form-Facing Material: Temporary structure or mold for the support of concrete while the concrete is setting and gaining sufficient strength to be self-supporting.

B. Formwork: The total system of support of freshly placed concrete, including the mold or sheathing that contacts the concrete, as well as supporting members, hardware, and necessary bracing.

PART 2 PRODUCTS

2.1 FORM MATERIALS

Forms for Exposed Finish Concrete: Plywood, metal, metal-framed plywood faced, or other acceptable panel-type materials, to provide continuous, straight, smooth, exposed surfaces.

2.2 PLYWOOD FORMS

Use plywood complying with U.S. Product Standard PS-1 “B-B (Concrete Form) Plywood”, Class I, exterior grade or better, mill-oiled and edge-sealed, with each piece bearing legible inspection trademark.

2.3 RELATED MATERIALS

A. Chamfer Strips: Wood, metal, PVC, or rubber strips, 3/4 by 3/4 inch (19 by 19 mm), minimum.

B. Form-Release Agent: Commercially formulated form-release agent that does not bond with, stain, or adversely affect concrete surfaces and does not impair subsequent treatments of concrete surfaces.

PART 3 EXECUTION

3.1 INSTALLATION OF FORMWORK

A. Comply with ACI 301.

B. Construct formwork, so concrete members and structures are of size, shape, alignment, elevation, and position indicated, within tolerance limits of ACI 117 and to comply with the

Surface Finish designations specified in Section 033000 "Cast-In-Place Concrete" for as-cast finishes.

C. Limit concrete surface irregularities to 1/4 inch per ACI 117 Class B, Surface Finish-2.0.

D. Construct forms tight enough to prevent loss of concrete mortar.

1. Minimize joints.

2. Exposed Concrete: Symmetrically align joints in forms.

E. Construct removable forms for easy removal without hammering or prying against concrete surfaces.

F. Chamfer exterior corners and edges of permanently exposed concrete.

G. Clean forms and adjacent surfaces to receive concrete. Remove chips, wood, sawdust, dirt, and other debris just before placing concrete.

H. Retighten forms and bracing before placing concrete, as required, to prevent mortar leaks and maintain proper alignment.

I. Coat contact surfaces of forms with form-release agent, according to manufacturer's written instructions, before placing reinforcement.

END OF SECTION 03 10 00

SECTION 03 20 00 - CONCRETE REINFORCING

PART 1 GENERAL

1.1 SUMMARY

This Section specifies steel reinforcement material for cast-in-place concrete.

PART 2 PRODUCTS

2.1 REINFORCING MATERIALS

A. Reinforcing Bars: ASTM A 615, Grade 60, deformed, except A706 for bars to be welded.

Detailed and fabricated in accordance with ACI 315.

B. Welded Wire Fabric: ASTM A1064, Standard Specification for Carbo-Steel Wire and Welded

Wire Reinforcement, Plain and Deformed, for Concrete.

C. Supports for Reinforcement: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fastening reinforcing bars and welded wire fabric in place. Use wire-bar-type supports complying with CRSI specifications.

1. For slabs-on-grade, use supports with sand plates or horizontal runners where base material will not support chair legs.

2. For exposed-to-view concrete surfaces, where legs of supports are in contact with forms, provide supports with legs that are plastic protected (CRSI, Class 1) or stainless steel protected (CRSI, Class 2).

PART 3 EXECUTION

3.1 PLACEMENT OF REINFORCEMENT

A. Comply with Concrete Reinforcing Steel Institute’s recommended practice for “Placing

Reinforcement Bars,” for details and methods of reinforcement placement and supports and as herein specified.

B. Avoiding cutting or puncturing vapor retarder during reinforcement placement and concreting operations.

C. Clean reinforcement of loose rust and mill scale, earth, ice, and other materials that reduce or destroy bond with concrete.

D. Accurately position, support, and secure reinforcement against displacement. Locate and support reinforcing by metal chairs, runners, bolsters, spacers, and hangers, as required.

E. Place reinforcement to obtain at least minimum coverages for concrete protection. Arrange, space, and securely tie bars and supports to hold reinforcement in position during concrete placement operations. Set wire ties so ends are directed into concrete, not towards exposed concrete surfaces. Lap distance shall be in accordance with ACI 315. Minimum lap of a bar is

24 times bar diameter.

F. Install welded wire fabric in lengths as long as practical. Lap adjoining pieces at least one full mesh and lace splices with wire. Offset laps of adjoining widths to prevent continuous line of lap in either direction.

4 END OF SECTION 03 20 00

SECTION 03 30 00 - CAST-IN-PLACE CONCRETE

1.1 SUMMARY

This Section specifies material for cast-in-place concrete.

PART 2 PRODUCTS

2.1 CONCRETE MATERIALS

A. Portland Cement: ASTM C 150, Type I or II. Use one brand of cement throughout project.

B. Fly Ash: ASTM C 618, Type C or Type F.

C. Normal Weight Aggregates: ASTM C33 and as herein specified. Provide aggregates from a single source for exposed concrete.

1. Do not use fine or coarse aggregates containing deleterious substances that cause spalling.

2. Local aggregates not complying with ASTM C33 but that special tests or actual service have shown to produce concrete of adequate strength and durability may be used when acceptable to Engineer.

D. Water: Potable.

E. Admixture, General: Provide admixtures for concrete that contain not more than 0.1 percent chloride ions.

1. Air-Entraining Admixtures - ASTM C 260, certified by manufacturer to be compatible with other required admixtures.

2. Water Reducing Admixture - ASTM C 494, Type A.

3. High-Range Water-Reducing Admixture (Superplasticizer) - ASTM C 494, Type F or Type

G.

4. Water-Reducing, Accelerating Admixture - ASTM C 494, Type E.

5. Water-Reducing, Retarding Admixture - ASTM C 494, Type D.

3 2.1 RELATED MATERIALS

A. Vapor Retarder: Use only materials that are resistant to deterioration when tested in accordance with ASTM E 154, as follows: Polyethylene sheet - not less than 8 mils thick.

B. Absorptive Cover: Burlap cloth made from jute or kenaf, weighing approximately 9 oz. per sq.

yd., complying with AASHTO M 182, Class 2.

C. Moisture-Retaining Cover: - One of the following, complying with ASTM C 171.

1. Waterproof paper.

2. Polyethylene film.

3. Polyethylene-coated burlap.

D. Liquid Membrane-Forming Curing Compound: Liquid-type membrane-forming curing compound complying with ASTM C 309, Type I, Class A. Moisture loss not more than 0.055 gr./sq.cm. when applied at 200 sq.ft./gal.

E. Evaporation Control: Monomolecular film-forming compound applied to exposed concrete slab surfaces for temporary protection from rapid moisture loss.

4 2.2 CONCRETE MIXTURES

A. Prepare design mixes for each type and strength of concrete by either laboratory trial batch or field experience methods as specified in ACI 211.1 and batched in accordance with ACI 304.

B. Limit use of fly ash to not exceed 25 percent of cement content by weight. Fly ash is not to be used where high early strength is specified.

C. Subcontractor shall design mixes to provide normal weight concrete with the following properties: 3500-psi, 28-day compressive strength; W/C ratio, 0.58 maximum (non-air-entrained), 0.46 maximum (air-entrained). Coarse aggregate may be any one of the following sizes: No. 57, No. 6, No. 67, or No. 8. When No. 8 size is used, the entrained air content shall be 8 +/- 2 percent. Otherwise, the entrained air shall be 6 +/- 2 percent.

D. Mix design adjustments may be requested by contractor when characteristics of materials, job conditions, weather, test results, or other circumstances warrant, as accepted by FAA.

Laboratory test data for revised mix design and strength results must be submitted to and accepted by FAA before using.

1. Admixtures

a. Use water-reducing admixture or high-range water-reducing admixture

(Superplasticizer) in concrete as required for placement and workability.

b. Use non-chloride 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 unless otherwise indicated.

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 following limits:

d. Concrete structures and slabs exposed to freezing and thawing - 4.5 percent (moderate exposure) 1-1/2-inch max. aggregate.

e. Other concrete (not exposed to freezing, thawing, or hydraulic pressure) or to receive a surface hardener: 2 percent to 4 percent air.

f. Use admixtures for water reduction and set control in strict compliance with manufacturer’s directions.

2. Slump Limits

a. Ramps, Slabs, and Sloping Surfaces - Not more than 3-inches.

b. Reinforced Foundation Systems - Not less than 1-inch and not more than 3- inches.

c. Other Concrete - Not more than 4-inches

5 2.3 READY-MIX CONCRETE

A. Ready-Mix Concrete shall comply with requirements of ASTM C 94, and as specified.

B. Provide batch ticket for each batch discharged and used in work, indicating project identification name and number, date, mix type, mix time, quantity, and amount of water introduced.

C. When air temperature is between 85 deg F (30 deg C) and 90 deg F (32 deg C), reduce mixing and delivery time from 1-1/2 hours to 75 minutes, and when air temperature is above 90 deg F (32 deg C), reduce mixing and delivery time to 60 minutes.

PART 3 EXECUTION

3.1 EXAMINATION

A. Verification of Conditions:

1. Before placing concrete, verify that installation of concrete forms, accessories, and reinforcement, and embedded items is complete and that required inspections have been performed.

2. Do not proceed until unsatisfactory conditions have been corrected.

3.2 PREPARATION

Provide reasonable auxiliary services to accommodate field testing and inspections, acceptable to testing agency, including the following:

Daily access to the Work.

Incidental labor and facilities necessary to facilitate tests and inspections.

Secure space for storage, initial curing, and field curing of test samples, including source of water and continuous electrical power at Project site during site curing period for test samples.

Security and protection for test samples and for testing and inspection equipment at Project site.

3.3 VAPOR BARRIER INSTALLATION

A. Following leveling and tamping of base for slabs on grade, place vapor retarder/barrier sheeting with longest dimension parallel with direction of pour.

B. Lap joints 6 inches and seal vapor barrier joints with manufacturer’s recommended mastic and pressure-sensitive tape.

C. Seal penetrations in accordance with vapor retarder manufacturer's instructions.

D. Protect vapor retarder during placement of reinforcement and concrete.

3.4 CONCRETE PLACEMENT

A. Before placing concrete, verify that installation of formwork, reinforcement, embedded items, and vapor retarder is complete and that required inspections are completed.

1. Immediately prior to concrete placement, inspect vapor retarder for damage and deficient installation, and repair defective areas.

2. Provide continuous inspection of vapor retarder during concrete placement and make necessary repairs to damaged areas as Work progresses.

B. Notify testing agency 24 hours prior to commencement of concrete placement.

C. Before test sampling and placing concrete, water may be added at project site, subject to limitations of ACI 301 (ACI 301M), but not to exceed the amount indicated on the concrete delivery ticket.

1. Do not add water to concrete after adding high-range water-reducing admixtures to mixture.

D. Deposit concrete continuously in one layer or in horizontal layers of such thickness that no new concrete is placed on concrete that has hardened enough to cause seams or planes of weakness.

1. Deposit concrete to avoid segregation.

2. Consolidate placed concrete primarily by mechanical vibrating equipment, supplemented by hand-spading, rodding, or tamping. Use equipment and procedures for consolidation of concrete in accordance with ACI 309.

3. Do not use vibrators to transport concrete inside forms.

4. Insert and withdraw vibrators vertically at uniformly spaced locations to rapidly penetrate placed layer and at least 6 inches (150 mm) into preceding layer.

E. Deposit and consolidate concrete for slabs in a continuous operation until placement is complete.

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

2. Maintain reinforcement in position on chairs during concrete placement.

3. Screed slab surfaces with a straightedge and strike off to correct elevations.

4. Level concrete, cut high areas, and fill low areas.

5. Begin initial floating using bull floats or darbies to form a uniform and open-textured surface plane before excess bleed water appears on the surface.

6. Do not further disturb slab surfaces before starting finishing operations.

F. Cold Weather Placing: Comply with provisions of ACI 306 and as follows.

1. Protect concrete work from physical damage or reduced strength that could be caused by frost, freezing actions, or low temperatures.

2. 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 that 80 deg F (27 deg C) at point of placement.

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

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

G. Hot Weather Placing: When hot weather conditions exist that would seriously impair quality and strength of concrete, place concrete in compliance with ACI 305 and as herein specified.

1. Cool ingredients before mixing to maintain concrete temperature at time of placement below

90 deg f (32 deg C). Mixing water may be chilled, or chopped ice may be used to control temperature provided water equivalent of ice is calculated to total amount of mixing water.

Use of liquid nitrogen to cool concrete is contractor’s option.

2. Cover reinforcing steel with water-soaked burlap if it becomes too hot, so that steel temperature will not exceed the ambient air temperature immediately before embedment in concrete.

3. Fog-spray forms, reinforcing steel, and subgrade just before concrete is placed.

4. Use water-reducing retarding admixture when required by high temperatures, low humidity, or other adverse placing conditions.

3.5 MONOLITHIC SLAB FINISHES

A. Scratch Finish: While still plastic, texture concrete surface that has been screeded and bull-floated or darbied. After leveling, roughen surface before final set with stiff brushes, brooms, or rakes.

B. Trowel Finish: Apply trowel finish to monolithic slab surfaces to be exposed to view. After floating, begin first trowel finish operation by hand or power-driven trowel. Continue troweling passes and restraighten until surface is free of trowel marks and uniform in texture and appearance.

3.6 CONCRETE CURING

A. Protect freshly placed concrete from premature drying and excessive cold or hot temperatures.

1. Comply with ACI 301 and ACI 306.1 for cold weather protection during curing.

2. Comply with ACI 301 and ACI 305.1 for hot-weather protection during curing.

3. Maintain moisture loss no more than 0.2 lb/sq. ft. x h, calculated in accordance with ACI

305.1, before and during finishing operations.

B. Curing Methods: Perform curing of concrete by moist curing, or by moisture-retaining cover curing, or by curing and sealing compound, or by combinations thereof, as herein specified.

1. Moist Curing: Keep concrete surface continuously wet by covering with water, or use continuous water-fog spray, or cover concrete surface with specified absorptive cover, thoroughly saturate cover with water, and keep continuously wet. Place absorptive cover to provide coverage of concrete surfaces and edges, with 4-inch lap over adjacent absorptive covers.

2. Moisture-Retaining Cover Curing: Cover concrete surfaces with moisture-retaining cover for curing concrete, placed in widest practical width with sides and ends lapped at least 3-inches and sealed by waterproof tape or adhesive. Immediately repair any holes or tears during period using cover material and waterproof tape.

3. Curing and Sealing Compounds: Apply curing and sealing compound to exposed interior slabs and to exterior slabs, walks, and curbs. Use membrane curing compounds that will not affect surfaces to be covered with finish materials applied directly to concrete. Apply specified curing and sealing 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 in accordance with manufacturer’s directions. Recoat areas subjected to heavy rainfall within 3 hours after initial application. Maintain continuity of coating and repair damage during curing period.

3.7 CONCRETE SURFACE REPAIRS

A. Repair and patch defective areas with cement mortar immediately after removal of forms.

B. Cut out honeycomb, rock pockets, voids over 1/4-inch in any dimension, and holes left by tie rods and bolts, down to solid concrete but in no case to a depth of less than 1-inch. Make edges of cuts perpendicular to the concrete surface. Thoroughly clean, dampen with water, and brush-coat the area to be patched with specified bonding agent. Place patching mortar before bonding compound has dried.

C. Test unformed surfaces, such as monolithic slabs, for smoothness and correct low and high areas.

3.8 QUALITY CONTROL TESTING

A. Testing Agency: Contractor will engage a qualified testing agency to perform tests and submit reports.

B. Testing agency to be responsible for providing curing container for composite samples on site and verifying that field-cured composite samples are cured in accordance with ASTM C31.

C. Testing agency to immediately report to Contractor and concrete manufacturer any failure of

Work to comply with Contract Documents.

D. Testing agency to report results of tests and inspections, in writing, to Contractor and concrete manufacturer within 48 hours of inspections and tests.

E. Sampling Fresh Concrete: ASTM C 172, except modified slump to comply with ASTM C 94.

1. Slump: ASTM C 143; one test at point of discharge for each day’s placement of each type of concrete; additional tests when concrete consistency appears to have changed.

2. Air Content - One for each day’s placement of each type of air-entrained concrete (ASTM

C 173, volumetric method for light weight concrete; ASTM C 231 pressure method for normal weight concrete).

3. Concrete Temperature: Test hourly when air temperature is 40 deg F (4 deg C) and below, when 80 deg F (27 deg C) and above, and each time a set of compression test specimens is made.

4. Compression Test Specimen: ASTM C 31; one set of 4 standard cylinders for each compressive strength test, unless otherwise directed. Mold and store cylinders for laboratory-cured test specimens except when field-cure test specimens are required.

5. Compression Strength Tests: ASTM C 39; one set for each day’s placement; one specimen tested at 7 days, two specimens tested at 28 days, and one specimen retained in reserve for later testing if required.

F. Test Results: Test results will be reported in writing to Contractor and concrete manufacturer within 24 hours after tests. Reports of compressive strength tests shall contain the project identification name and number, date of concrete placement, name of concrete testing service, concrete type and class, location of concrete batch in structure, design compressive strength at

28 days, concrete mix proportions and materials, compressive breaking strength, and type of break for both 7-day tests and 28-day tests.

G. Standards: Strength level of concrete will be considered satisfactory if averages of sets of three consecutive 28-day strength test results equal or exceed specified compressive strength, and no individual strength test result falls below specified compressive strength by more than 500 psi.

H. Additional Tests: The testing service will make additional tests of in-place concrete when test results indicate specified concrete strengths and other characteristics have not been attained in the structure, as directed by FAA. Testing service may conduct tests to determine adequacy of concrete by cored cylinders complying with ASTM C 42, or by other methods as directed.

Contractor shall pay for such tests when unacceptable concrete is verified.

I. Contractor will be required to correct deficiencies in the Work that test reports and inspections indicate do not comply with the Contract Documents.

5 END OF SECTION 03 00 00

SECTION 05 51 36 – PREFABRICATED ALUMINUM STAIRS AND PLATFORMS

SUMMARY

A. Section Includes:

1. Prefabricated Industrial Class stairs with heavy duty aluminum I-bar grating treads.

2. Prefabricated Industrial Class stairs and platforms.

3. Factory welded aluminum handrails.

1.2 RELATED SECTIONS

A. Section 03 30 00 - Cast-in-Place Concrete.

1.3 REFERENCES

A. OSHA 1910.23: Ladders

B. OSHA 1910.25: Stairways

C. OSHA 1910.28: Duty to have fall protection and falling object protection

D. OSHA 1910.29: Fall protection Systems and falling object protection - criteria and practices

1.4 SUBMITTALS

A. Product Data:

1. Manufacturer's data sheets on each product to be used.

2. Preparation instructions and recommendations.

3. Storage and handling requirements and recommendations.

4. Typical installation methods.

B. Shop Drawings:

1. Include plans, elevations, sections, details, and attachment to other work.

2. Indicate sizes of metal sections, thickness of metals, profiles, holes, and field joints.

3. Include plan at each level.

4. Indicate locations of anchors, weld plates, and attachment of handrails.

C. Delegated Design Submittal: For stairs and stair landing supports, include recommended foundation design from manufacturer or delegated professional engineer.

D. Warranty: Manufacturer's standard limited warranty unless indicated otherwise.

1.5 QUALITY ASSURANCE

A. Manufacturer Qualifications: Company specializing in manufacturing products specified in this section with a minimum five years documented experience.

B. Installer Qualifications: Company specializing in performing Work of this section with minimum two years documented experience with projects of similar scope and complexity.

C. Source Limitations: Provide each type of product from a single manufacturing source to ensure uniformity.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Store and handle in strict compliance with manufacturer's written instructions and recommendations.

B. Protect from damage due to weather, excessive temperature, and construction operations.

C. Repair or replace damaged materials or structures as directed.

PART 2 PRODUCTS

2.1 MANUFACTURERS

A. Basis of Design: fs Industries welded aluminum prefab OSHA stairway (model 017S36140-G) and aluminum prefab stair landing (model LND-ER-AL36144).

B. Substitutions: equivalent material by other manufacturers is permitted, upon approval of submittal.

C. Full compliance to OSHA 1910.25 is required.

2.2 REQUIREMENTS

A. Structural Performance of Stairs: Metal stairs shall withstand the effects of gravity loads and the following loads and stresses within limits and under conditions indicated:

1. Capacity: Unit shall support a 1000 lbs (453.6 kg) total load without failure.

2. Standards Requirements: Unit shall be designed and manufactured to meet or exceed

OSHA 1910.25.

3. Wind, snow and ice loads on exterior stairs.

4. Stair Framing: Capable of withstanding stresses resulting from railing and guard loads in addition to loads specified above.

B. Degree of incline: 45 degrees.

C. Step…