Attachment 4 - Specification for Concrete Sinkers - Copy.pdf

ATTACHMENT 4

SPECIFICATION FOR 1,000lb, 1,500lb and 2,000lb, CONCRETE SINKERS

United States Coast Guard River Tender boats throughout the Midwest utilize concrete sinkers as mooring anchors to hold buoys in place on the river bottom on the various river systems. The buoys are secured to the concrete sinker either by wire rope or ½” chain with a shackle connection.

Scope: Furnish all labor, materials, transportation and equipment necessary to fabricate and deliver 1000lb, 1,500lb and 2,000lb, concrete sinkers to various Coast Guard River Buoy tenders.

References

• American Society for Testing and Materials (ASTM):

A 36/A 36M Standard Specification for Carbon Structural Steel C 150-96

Specification for Portland Cement C 33-93 Specification for Concrete Aggregates C 143-90a Test Method for Slump of Hydraulic Cement Concrete C 39-96 Test Method for Compressive Strength of Cylindrical Concrete Specimens

• American Concrete Institute (ACI)

ACI 318 Building Code Requirements for Reinforced Concrete

Applicable Drawings:

USCG CEU DWG. 6292, Standard Sinker 8th District (oan) Sheet 1

Requirements:

1. GENERAL

a. Releasing agents - The contractor shall use only environmentally safe releasing agents when pouring sinkers.

2. SINKERS

Contractor shall furnish all labor, materials, transportation and equipment to fabricate and deliver 1000lb, 1500lb and 2,000lb, concrete sinkers. Sinker dimensions shall conform to applicable drawings listed above. Cured sinkers shall be within -3% or +10% of the design weight. The contractor shall replace any sinker found to be out of tolerance weight at no additional cost to the Government.

3. CONCRETE

A ready-mix concrete shall be used which meets the following requirements:

a. Mix - The mix shall be designed to provide a minimum compressive strength of 3000 psi at 28 days. Compressive tests shall be made at the discretion of the Contracting Officer.

Cured concrete shall weigh not less than 140 pounds per bulk cubic foot of sinker.

b. Materials - Portland cement shall be in accordance with ASTM C 15, Type I or II. Fine aggregate (sand) shall be in accordance with ASTM C 33. Coarse aggregate shall be Class 4M, size No. 7 (graded from ½ inch to No. 4 sieves) or size No. 67 (graded from ¾ inch to No. 4 sieves) in accordance with ASTM C 33.

c. Slump - The slump of the concrete shall be at least 2 inches and will not exceed 5 inches as delivered. The slump test shall be in accordance with ASTM C 143. Samples for slump determination will be taken from concrete during placing in the forms. Slump test may be conducted at the Contracting Officer’s discretion.

d. Compressive Tests (as required) - Testing of specimens for compressive strength shall be in accordance with ASTM C 39. Tests will be made at 7 and 28 days from time of molding. Six specimens will be broken for each batch of concrete tested (3 at 7 days and 3 at 28 days), and their average strength represent the strength of the batch. Compressive test may be conducted at the Contracting Officer’s discretion.

e. Workmanship - All workmanship, placement and curing shall be in accordance with the applicable sections of ACI 318. Concrete shall be uniformly distributed within the forms by the use of vibrators or other means. Finished concrete shall be free of voids, planes or discontinuity, or areas of honeycomb.

f. Curing - All concrete sinkers shall be allowed to cure for a minimum of three days before they are moved or stacked.

4. LIFTING EYES

Contractor shall supply 1-inch diameter round stock steel, which shall be placed in the concrete and used to lift the sinker. The steel shall meet the requirements of ASTM A36/A 36M.

• The lifting eyes and shall be shaped and positioned as shown on applicable drawings.

5. DELIVERY

Deliveries shall be made to the shipping addresses listed on Attachment 7, Shipping Addresses, between the hours of 8 A.M. and 1 P.M., Monday through Friday. No deliveries are to be made on Saturdays, Sundays, or Legal Federal Holidays. Multiple deliveries are acceptable. Concrete Sinkers shall be delivered to the pier or other location as directed by receiving personnel. The Government shall be responsible for off-loading concrete sinkers delivered during the times specified above. The Contractor shall contact the Officer-in Charge of each unit at least 48 hours prior to delivery.

6. SINKERS POURED ON-SITE – The Contractor may not pour sinkers on-site.

7. DELIVERY SCHEDULE - The Government requires delivery to be made according to the following schedule:

REQUIRED DELIVERY SCHEDULE

ITEM

% COMPLETE

WITHIN CALENDAR DAYS

AFTER THE DATE OF

RECEIPT OF NOTICE OF

AWARD

All Orders 20% 30 All Orders 40% 60 All Orders 60% 90 All Orders 80% 120 All Orders 100% 150

NOTE: For All Delivery Orders – In the event the total quantity of a delivery order is 200 concrete sinkers or less, 50% of the order shall be delivered within 30 days, and the remaining 50% of the order shall be delivered within 60 days.

8. PACKAGING AND MARKING – Shall be in accordance with FAR Clause 52.247-35 fob Destination (Nov 1991). The Contractor shall deliver the Concrete Sinkers in accordance with the contract requirements.