Statement of Work.pdf

Statement of Work

Concrete placement of a test floor slab for laboratory fire testing

A. BACKGROUND INFORMATION

The National Institute of Standards and Technology (NIST) is currently conducting a series of compartment fire experiments on steel-concrete composite floor assemblies commonly used in high-rise building construction. The objective of this test program is to quantify the system-level fire resistance, structural performance and failure modes of the full-scale mechanically loaded composite floor assembly framed into a real building when exposed to a fire, which cannot be achieved by the current standard testing method using furnaces. The technical information and data generated from this test program will be used to validate computational models predicting the fire resistance and behavior of similar types of structures and to enhance the fire safety and building codes in the United States.

B. OBJECTIVES

NIST requires cast-in-place concrete placement of a test floor assembly for fire testing at the National Fire Research Laboratory (Building 205) located at the NIST Campus in Gaithersburg, Maryland. NIST is seeking a general contractor to furnish the specified concrete mixture, all labors, other means and methods (e.g. pumping equipment), and supervision, insurance, permits, and incidentals necessary for all elements of the work specified herein. The Contractor shall complete concrete placement and finishing in accordance with relevant American Concrete Institute (ACI) specifications.

D. TASKS

This requirement involves three tasks as detailed below. Tasks 2 and 3 shall be completed in the same day.

Task 1: Safety Plan & Schedule

Within ten business days after receipt of award, the Contractor shall provide a health and safety plan for the concrete placement project specified herein. The health and safety plan shall identify potential hazards associated with each aspect of the work and provide a plan to mitigate each hazard. The plan shall include safety controls, Personal Protective Equipment (PPE) required for each task, what training has been provided to employees, an emergency response plan, and recordkeeping process.

The Contractor shall also propose a schedule for the tasks identified in this statement of work. The schedule shall include the proposed delivery date and time, and the proposed schedule for performance of work the day of performance. NIST will provide feedback and the Contractor shall update the schedule as appropriate for final review and concurrence.

Task 2: Procurement and delivery of concrete mix

The Contractor shall accomplish this task in accordance with the current edition of publications listed below:

• ACI 211.2 “Standard Practice for Selecting Proportions for Structural Lightweight Concrete”

• ASTM C39 “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens”

• ASTM C192 “Standard Practice for Making and Curing Concrete Test Specimens in the laboratory”

The Contractor shall supply a lightweight concrete mix as specified in Table 1 below with a minimum compressive strength of 4000 psi (lb/in2). A mix design shall be submitted to NIST for approval a minimum of two (2) weeks prior to the placement of concrete. Upon the arrival of mixing truck(s) at NIST (See Section H of this Statement of Work for security/site access requirements), the Contractor shall submit a batch ticket showing a concrete mixture matching the specifications in Table 1 for NIST approval prior to concrete placement. If a batch data in the ticket fails to conform with the mix design in Table 1, mixing truck(s) will be immediately returned to the plant at Contractor expense and the Contractor shall be required to return within two (2) business days with a new mix and batch ticket for review and approval.

Table 1: Required concrete mix

The Contractor shall furnish the concrete in accordance with Table 1 in the amount specified in Table 2 below. The Contractor shall furnish the concrete at the National Fire Research Laboratory (NFRL) located at 100 Bureau Drive, Building 205, Gaithersburg, MD 20899.

Table 2 Required cast-in-place concrete volume

Pour Floor Size (Length x width) Est. Volume (cyd)

Floor Height

1 36 ft x 24 ft 18 12 ft from ground

Task 3: Concrete placement and finishing

The Contractor shall complete this task in accordance with the current edition of publications listed below unless otherwise specified in this document:

• ACI 301 Section 5 “Specifications for Structural Concrete for Buildings”

• ACI 304R “Guide for Measuring, Mixing, Transporting, and Placing Concrete”

• ACI 302.1R “Guide for Concrete Floor and Slab Construction”

• ACI 304.2R “Placing Concrete by Pumping Methods”

Figures 1 and 2 below show the location where concrete placement shall take place and the plan view of formwork, respectively. The concrete shall be placed on 3-inch deep ribbed steel decking supported on steel frames. The thickness of concrete above the deck rib shall be 3-¼ inches. NIST will complete the fabrication of the steel deck units, formwork and placement of steel reinforcement, instrumentation and other cast-in hardware, and shoring prior to concrete placement. The Contractor shall place concrete and furnish all labor, means and methods (e.g. pumping equipment), supervision, insurance, permits, and incidentals required for this work.

Figure 1 Location of concrete placement (inside Building 205)

36 ft

24 ft

New concrete12 ft

Figure 2 Plan view of tentative formwork for a 60 ft x 36 ft floor

Pumping concrete must conform to ACI 304.2R. Pumping shall not result in separation nor cause interruptions sufficient to permit loss of plasticity between successive increments. Loss of slump in pumping equipment shall not exceed 2 inches at discharge/placement. The Contractor shall not convey concrete through pipe made of aluminum or aluminum alloy. NIST will take samples for testing concrete slump and unit weight at both the point of delivery to the pump and at the discharge end. Testing will be completed day-of. The results from on-site testing shall meet the values specified in a batch ticket with the maximum 10% margin of error.

Finishing surface of the floor slab shall conform to ACI 301 and ACI 302.1R. The Contractor shall place, consolidate, and immediately strike off concrete to obtain proper contour, grade, and elevation before bleed-water appears. The Contractor shall permit concrete to attain a set sufficient for floating and supporting the weight of the finisher and equipment. If bleed-water is present prior to floating the surface, the Contractor shall drag the excess water off or remove by absorption with porous materials. The Contractor shall not use dry cement to absorb bleed-water.

The Contractor shall finish concrete in accordance with ACI 301 Section 5 for a floated finish.

The Contractor shall furnish burlap blankets that cover the floor area of 36 ft x 24 ft after finishing is complete. The supplied burlap shall conform to ASTM C171for Sheet Materials for Curing Concrete.

The Contractor is not responsible for deconstructing the steel frame the concrete slab is poured in.

E. INSPECTION AND ACCEPTANCE

NIST staff will review the Contractor’s safety plan and schedule for reasonableness before concrete delivery is scheduled. The schedule shall be mutually agreeable between NIST and the Contractor. NIST staff will inspect the delivered concrete mixture for acceptance before pouring. The concrete mixture shall be accepted if it meets the requirements identified in this statement of work. Concrete materials that do not meet the requirements of Tasks 2 and 3 in Section D are unacceptable. Concrete placement shall be accepted if it meets the requirements identified in this statement of work. Concrete placement and finishing that do not meet the requirements of Task 3 in Section D are unacceptable. Additional requirements for acceptance are specified below:

• All mixing truck(s) containing the required amount of concrete shall arrive at NIST in a timely manner, within 15 minutes of the scheduled arrival time, prior to concrete placement. Mixing trucks shall sit in the NIST campus up to 90 minutes before the entire load is rejected due to inspection failure. The contractor shall be responsible for allotting itself enough time to complete site access activities (See Section H - Security).

• Concrete placement shall be completed within eight hours after delivery.

If unacceptable, the Contractor shall return within two (2) business days with a new mix and batch ticket for review and approval.

F. DELIVERABLES

Deliverable 1: The contractor shall furnish a Safety Plan within ten business days after receipt of award.

At the same time, within ten business days after receipt of award, the contractor shall also provide a proposed schedule for NIST review.

Deliverable 2: Insurance Certificates (See Section K)– shall be submitted within ten (10) calendar days after award of order

Deliverable 3: Finished cast-in-place concrete slab with the NIST mixture design specified in Table 1 for the forthcoming structural fire testing at NIST. The finished slab shall be cast-in place no later than April 15, 2020.

G. GOVERNMENT-FURNISHED PROPERTY, MATERIAL, EQUIPMENT, OR

INFORMATION

• NIST will provide drawings and specifications necessary for detailed locations of reinforcement, cast-in sensors and hardware at time of award, if requested.

• NIST will provide suitable room and space required for equipment and mixing truck(s).

H. SECURITY

NIST is a Federal facility and access is controlled at all entrances to the campus. Only Government employees may grant access to non-Government employees. All non-Government employees must be registered with security prior to site access. Contractor shall notify the NIST Technical Point of Contact (TPOC) a minimum of 72 hours prior to site access. Contractor shall provide NIST with first and last names, country of citizenship, and whether the individual has a permanent resident card, (a.k.a. Green Card), of all personnel requiring site access. If any individuals are here on a work visa, they will need to complete a NIST 1260 form and return to theTPOC. Please refer to the following web site for additional Visitor Information http://www.nist.gov/public_affairs/visitor/

Automobile & Personnel Access:

Contractor personnel arriving in cars on their first day must check in at the visitor center to receive a temporary paper badge prior to proceeding to the project site. Hours of operation of the visitor center are 0600-1700. Once in possession of a valid NIST badge, workers may enter via the Main Gate or Gate “C” and proceed to the project site. Note that all automobiles are subject to a random inspection.

Trucks: All Trucks are to enter NIST via “C” Gate along Quince Orchard Rd. between 6:00 am and 3:30 pm daily, and at the main gate off of W. Diamond Ave. between 3:30 pm and 4:30 pm. No deliveries will be allowed after 4:30 pm. “Trucks” include such vehicles as pick-ups with storage compartments, delivery trucks, delivery vans, and tractor center. Trucks arriving through Gate C will be directed to the Building 301 Truck Inspection Station. At Building 301, trucks will be registered, inspected, and the drivers will be granted access. Any truck which exits the installation will have to be re-inspected upon re-entry at Building 301. A vehicle dashboard placard will be placed within the truck. Placards change daily.

NIST Truck Inspection Stations hours are:

6:00am -3:30pm at Building 301

3:30 pm – 4:30pm at “A” Gate – (Main gate)

NFRL (Building 205) regular hours are 7:30am – 4:00pm. The Contractor shall coordinate with the TPOC if it would like to begin concrete placement earlier than 7:30am.

I. PLACE OF PERFORMANCE

Performance will be on site at NIST, 100 Bureau Drive (Building 205), Gaithersburg, MD campus.

J. PERIOD OF PERFORMANCE

All specified tasks shall be completed within six (6) months after contract award.

K. INSURANCE REQUIREMENTS

The contractor shall have construction insurance including:

a) General Liability Insurance

b) Worker’s Compensation

c) Third-Part Liability Coverage (Concrete Pump Operation and Mix Truck)

d) Commercial Auto Insurance http://www.nist.gov/public_affairs/visitor/

Statement of Work