Counterweight SOW 3-3-21.pdf

Concrete Counterweight SOW

Spec #: 2017-XX Rev: - Page 1 of 4

STATEMENT OF WORK

1. SCOPE

Procurement of fifty (50) “small” and fifty (50) “large” concrete counterweights to facilitate the securement of temporary structures. Dimensions of small/large counterweights are specified in paragraphs 3.2.1. and 3.2.2 respectively.

1.1. Location of Work

1.1.1. Portsmouth Navy Shipyard

2. REFERENCES

2.1. ACI 301-10; Specifications for Structural Concrete

2.2. ACI 318-14; Building Code Requirements for Structural Concrete

2.3. ACI 214R-11; Guide to Evaluation of Strength Test Results of Concrete

2.4. ASTM Specifications as noted here-in

3. REQUIREMENTS

3.1. All counterweights shall possess sufficient durability, dimensions, and components/features as listed below. Specified values for all requirements must be in accordance with references 2.1. through 2.4.

3.1.1. Minimum concrete compressive strength: 4500 PSI

3.1.1.1 Capable of being stacked 4 blocks high.

3.1.2. Maximum water-cement ratio 0.45

3.1.3. Air content: 6% +/- 1.5%

3.1.4. Concrete Materials

3.1.4.1. Cementitious Materials

3.1.4.1.1. Shall meet Specification ASTM C150

3.1.4.2. Aggregates

3.1.4.2.1. Shall meet Specification ASTM C33

3.1.4.2.2. Maximum aggregate size 1"

3.1.4.3. Water

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3.1.4.3.1. Shall conform to ASTM C1602 and be free of deleterious amounts of chloride ion.

3.1.4.4. Admixtures

3.1.4.4.1. Water reduction and setting time modification, ASTM C494

3.1.4.4.2. Producing flowing concrete, ASTM C1017

3.1.4.4.3. Air Entrainment, ASTM C260

3.1.4.4.4. Inhibiting chloride-induced corrosion, ASTM C1582

3.1.4.4.5. Calcium chloride or admixtures containing chloride from sources other than impurities in admixture ingredients shall not be used.

3.2. Approximate Outside Dimensions

3.2.1. Small counterweight: 2’ high x 3’ long x 3’ wide

3.2.1.1. 16.7 cubic feet minimum volume

3.2.2. Large Counter weight: 3.25’ high x 3’ long x 3’ wide

3.2.2.1. 26.7 cubic feet minimum volume

3.3. Components/Features

3.3.1. Lifting eye

3.3.1.1. Preapproved lifting eye: ALP R-ANCHO; Mfr. Model # LRA7169G

3.3.1.2. Anchor must be cast in place

3.3.1.3. Stainless steel

3.3.1.4. Minimum 5000 LB Working Load Limit

3.3.1.5. 6” minimum embedment length

3.3.1.5.1 Capable of having a 1”diameter fiber rope passed between the concrete and the steel anchor

3.3.1.6. ½” minimum anchor rod diameter

3.3.1.7. Placed on top surface of counterweight

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3.3.1.7.1. Centered about all axis

3.3.1.8. Recessed to be flush with the top surface of the counterweight

3.4. Reinforcement

3.4.1. Provide macro fiber mesh to increase cohesion, flexural toughness, impact resistance, and shatter resistance as well as to reduce shrinkage

3.4.1.1. Preapproved fiber mesh: SikaFiber Enduro Prime

3.4.1.2. Dosage of fiber mesh to be by manufacturer instruction

3.4.2 Provide (10) #6 bars top and bottom each direction, equally spaced, 2” min edge distance

3.4. Final Weight

3.4.1. Small counterweight minimum: 2500 LBS

3.4.2. Large counterweight minimum: 4000 LBS

3.5. Fork Truck Pockets

3.5.1. Capable of being transported by fork truck with four way fork truck entry

3.5.2. Pockets to be formed as recessions on the bottom of the counterweights

3.5.2.1 Pocket Dimensions: 8” wide x 3” high

3.5.2.2 Pocket Spacing: 1’-8” ctr to ctr

3.6. Documentation

3.6.1. Documentation of concrete mixture characteristics shall be submitted for review by the Government POC before the mixture is used and before making changes to mixtures already in use.

3.6.2. Evidence of the ability of the proposed mixture to comply with the concrete mixture requirements, as defined in this document and any referenced documents, shall be included in the documentation. The evidence shall be based on field test records or laboratory trial batches. Field test records shall represent conditions similar to those anticipated during the proposed Work.

3.7. Testing

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3.7.1. Concrete durability requirements shall be tested by appropriate ACI-certified testing personnel in accordance with References noted herein.

3.7.1.1. Test results must be provided to Government POC for review and approval.

3.8. Labeling

3.8.1. All counterweights must be permanently labeled with the minimum weight as specified in paragraph 3.5.

4. RESPONSIBILITIES

4.1. C230 of the PNSY is required to confirm that all products meet technical specifications prior to formal acceptance via signed technical conformance checklist.

5. DELIVERY / RETURN

5.1. Any components that are delivered not in accordance with any above requirement shall be returned and replaced by the vendor. Code 230 of PNSY shall be present during acceptance of all material.