National Institute of Standards & Technology, Acquisition & Assistance Division, Bldg. 301, Rm. B117, Gaithersburg, MD

66 -- HIGH INTENSIVE PAN TYPE LABORATORY CONCRETE MIXER SOL 52SBNB6C9286 DUE 091096 POC Sandra Febach (301) 975-6326, FAX (301) 963-7732 The National Institute of Standards and Technology has a requirement to purchase a high intensive pan type laboratory concrete mixer. The mixer shall be of welded metal construction and be capable of producing highly uniform concrete batches over a wide variety of mix designs and batch sizes. Mixtures can vary from very dry to very wet, with aggregate sizes from sand to one inch crushed rock. Batch sizes can vary from two (2) to ten (10) cubic feet. I. Mixing action: The mixer shall be of the ''counter-current'' type with a plow rotor, a mixing rotor and one or more side scrapers. This will ensure maximum particle travel both vertically and horizontally. All rotors and scrapers shall have replaceable blades. The mixing pan shall rotate opposite to the rotor travel. Both rotors and pan shall be powered by separate electric (460 VAC) motors each separately controlled. Each electric motor shall be sufficient size to ensure proper mixing action of even ''zero slump'' concrete mixes within five (5) minutes. II. Mixer Pan: The metal pan shall be of the bottom discharge type with the gate being activated by shop air pressure. The gate shall open fully so as not to impair the discharge of the concrete mix. The pan shall be equipped with replaceable wear liners on both the sides and the bottom. III. Pan Hood: The pan hood shall be equipped with one or more sealed access door(s) suitable for charging the mixer. The door(s) shall be interlocked to prevent the start up of any motor while open or ajar. There shall be a highly effective dust seal between the pan hood and the pan itself to minimize dust emissions into the laboratory. IV. Supporting Frame: The mixer shall be mounted on a suitable supporting frame with clearance underneath for a portable hopper. The minimum clearance height is 38'' and the minimum clearance width is 58''. This frame shall have suitable foot pads for anchoring to a concrete floor. V. Control/Electrical Console: The console shall be a free standing NEMA 12 type enclosure. This shall contain all necessary controls, switches, timers, meters, etc. for complete control of the mixer. As a minimum it shall have: (1) Master disconnect; (2) Master start with pilot light; (3) Master ten (10) minute timer capable of controlling the mixing time to the nearest second; (4) Amp. Meter for each motor; (5) On/Off switch with pilot light for each motor; (5) Emergency stop switch of approximately three (3) inches in diameter; and (6) Controls for operating the discharge gate. This console shall be installed by qualified NIST personnel once a final position has been selected. VI. Manuals: Supply two (2) complete copies of all engineering drawings, component specifications, electrical wiring schematics and operating manuals. VII. Standards: This equipment shall meet all applicable OSHA, UL, and ASTM standards. VIII. Warranty: The warranty for this mixer and associate control panel shall be 100% performance for one year as a minimum, except for wear parts such as mixer blades. Delivery shall be FOB Destination within 60 days after contract award. This is a combined synopsis/solicitation for commercial items prepared in accordance with the format in Subpart 12.6, as supplemented with additional information included in this notice. This announcement constitutes the only solicitation; proposals are being requested and a written solicitation will not be issued. Solicitation number 52SBNB6C9286 is issued as a request for proposals (RFP). This solicitation is 100% set-aside for small business. The applicable SIC code is 3531, with a size standard of 750 employees. Award will be made to the lowest priced, technically acceptable offer. Offers shall include appropriate product literature, or a statement of capability which clearly documents that offered products meet or exceed the above specifications. The clause at 52.212-4, Contract Terms and Conditions--Commercial Items, applies to this acquisition. Also the clause at 52.212-5, Contract Terms and Conditions Required to Implement Statutes or Executive Orders--Commercial Items, applies to this acquistion, including subparagraphs (3) 52.219-8, (6) 52.222-26, (7) 52.222-35, (8) 52.222-36, (9) 52.222-37, (10) 52.225-3, (13) 52.225-18, and (15) 52.225-21. Offers are due no later than close of business September 10, 1996, and must include a completed copy of the provision at 52.212-3, Offeror Representations and Certifications--Commercial Items. For information, call the POC identified above. See Numbered Note 1. (0234)

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