Department of the Army, New England Division, Corps of Engineers, 424 Trapelo Road, Waltham, Massachusetts 02254-9149

66 -- INSTRUMENTS AND LABORATORY EQUIPMENT SOL DACA33-96-R-0006 DUE 041196 POC Julie Mackley, 617-647-8413 The New England Division, Corps of Engineers Intends to Negotiate A Sole Source Contract with Dynatest, P.O. Box 71, Ojai, California 93024, for the purchase of Forty-Two (42) Soil Stress Cells for the purpose of measuring sub-grade soil stress during pavement and sub-grade testing. The soil pressure transducers or cells will be used in a pavement layer investigation where different layer compositions and soil types will be used to test pavement performance under various environmental and loading conditions. The cells will be embedded in the different layers during construction. The cells will be used to measure dynamic load induced stresses as well as earth load induced stresses in cohesionless and cohesive soils such as sands, silts and clays. General Cell Requirements: The cells will be of titanium construction. The diameter to thickness ratio of the overall cell must be more than 5:1. The overall diameter shall not be less than 50 mm and not more than 75 mm. The sensing area on the cell face shall not be less than 75% of the total cell face area. The transducer must be able to resist galvanic and mechanical deterioration. The full scale output shall be suitable for recording with computer data acquisition equipment. The signal cables must be potted to the cell in such a way that it will eliminate water entry. The whole soil pressure transducer must work when submersible a depth of 10 m water. The gages must be provided with a minimum of 10 meters of Teflon coated and electrically shielded cable for long term embedment in road pavement layers. Four (4) wire strain gauge sensor with a range of 0 to 28 psi. Temperature corrected output over the range of -15 to 100 degrees C. The internal pressure transducer must be a full wheatstone bridge configuration which is temperature compensated for use in the range of -15 to 150 degrees centigrade. For a cell to comply with the requirements for this investigation it must meet the following measurement characteristics. The cells output should be stable for 5 hours under the constant embedment pressure of the soil calibration test within 1.0% of its full scale range. The range of output with a change over the operating temperature range specified, shall not exceed plus/minus 1.0% of full scale as measured in the fluid calibration test. The non-linearity shall not exceed 1.0% of full scale under the first and last loading and unloading cycle of both the fluid and soil calibration tests. The hysteresis shall not exceed 1.0% of full scale under the first and last loading and unloading cycle of both the fluid and soil calibration tests. The repeatability of the transducer shall be within 1.0% of full scale while comparing each reading of the first and last load cycle of the fluid. These items must be delivered to the U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, New Hampshire, 180 calendar days from award. Interested parties having the capability to furnish the above described items should submit their product and price information which shall be considered by the agency. All responses must contain sufficient technical and pricing information to enable evaluation of the capability of the product to meet the requirements of the agency. This notice of intent is not a request for competitive proposals. No solicitation document exists and no award will be made on the basis of any response to this advertisement. Interested parties may respond in writing to New England Division, Corps of Engineers, ATTN: Purchase Division, 424 Trapelo Road, Waltham, MA 02254-9149. All responses from responsible sources which are received within 15 days of the date of the publication of this synopsis will be fully considered. As a result of analyzing responses to this synopsis of intent, the Contracting Officer may determine that a solicitation will be issued. If a solicitation will be issued no additional synopsis will be published. Any such solicitation will be issued to the intended vendor and firms that respond to this synopsis of intent or otherwise request a copy of the solicitation. Specifications available on or about 031196 at no charge. (0052)

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