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HomeMy WebLinkAboutOrdinances Book 17, Page 722, No Resolution Number722 A RESOLUTION REQUESTING THE CITY MANAGER TO ADVERTISE FOR BIDS FOR THE PURCHASE OF APPROXIMATELY 40,000 SQUARE YARDS OF BITUMINOUS SLURRY SURFACE AND INSTALLATION ON CITY OF PADUCAH STREETS, AND PRESCRIBING THE CONDITIONS UPON WHICH SUCH PURCHASE SHALL BE MADE BE IT RESOLVED BY THE BOARD OF COMMISSIONERS OF THE CITY OF PADUCAH, KENTUCKY: SECTION 1. That the City Manager be, and he is hereby, authorized to advertise for bids for sale to the City of Paducah of approximately 40,000 square yards of bituminous slurry surface for City of Paducah streets as may be designated by the City Manager, such material and installation to meet the following specifications: 1. SCOPE The work covered by this specification consists of furnishing all plant, labor, equipment and materials in performing all operations necessary in connection with the application of a bituminous slurry surface upon the designated surface, in complete and strict accordance with the specifications. 2. DESCRIPTION The bituminous slurry surface shall consist of a mixture of emulsified asphalt, mineral aggregate, and water; property pro- portioned, mixed, and spread evenly on the surface as specified herein and as directed by the Engineer. The cured slurry shall have a homogeneous appearance, fill all cracks, adhere firmly to they surface and have skid resistant texture. 3. MATERIALS A. Asphalt Emulsion. The emulsified asphalt shall conform to the requirement of American Association of State Highway Officials. Specification for type of emulsion SS -1h, etc. except that the viscosity shall be changed to range of 20-50. The contractor shall furnish a certified statement from the emulsion manu- facturer giving analysis of the base asphalt used in the manu- facture of the emulsion. The penetration of the base asphalt shall be 85-100 penetration depending on application, traffic and condition of weather. B. Aggregate. The mineral aggregate shall consist of natural or manufactured sand, slag, crusher fines, and others, or a combination thereof. Smooth textured sand of less than 1.25 percent water absorption shall not exceed 50 percent of the total combination aggregate. The aggregate shall be clean and free from vegetable matter and other deleterious substances. When tested by AASHO T176, the aggregate blend shall have a sand equivalent of not less than 45 minimum. Mineral fillers such as limestone dust, and others shall be considered as part of the blended aggregate and shall be used in minimum required amounts. They shall meet the graduation requirements of ASTM D242-64. Mineral fillers shall only be used if needed to improve the workability of the mix or gradation of the aggregate. The combined mineral aggregate shall conform to the following gradation when tested by the previously mentioned test. Sieve Size Surface Percent Passing 1/2 100 3/8 100 No. 4 85-100 No. 8 65-90 723 No. 8 65-90 No. 16 45-70 No. 30 30-50 No. 50 18-30 No. 100 10-21 No. 200 5-15 General Surface. This aggregate blend is used when it is desired to fill surface voids, correct severe surface conditions, and provide sealing and a minimum wearing surface. An approximate application rate of approximately 15 pounds per square yard based on dry aggregate weight is used when standard aggregates are utilized. A typical example of this type of slurry surface would be on pavements with medium textured surfaces which would require this size of aggregate to fill in the cracks and provide a minimum wearing surface. Another example would be placing a general slurry on flexible base, stabilized base, or soil cement as a sealer prior to final paving. C. Water. All water used with the slurry mixture shall be potable and free from harmful soluble salts. D. Laboratory Testing. Sources of all material:> shall be selected prior to the time the materials are required for use in the work. All samples shall be taken according to procedures previously mentioned. All materials shall be pretested in a qualified laboratory as to their suitability for use in slurry. The theoretical asphalt con- tent shall be determined. The laboratory shall also determine if a mineral filler is required, and if so, how much should be used. E. Stockpiling of Aggregate. Precautions shall be taken to insure that stockpiles do not become contaminated with over -sized rock, clay, silt, or excessive amounts of moisture. The stockpile shall be kept in areas that drain readily. Segregation of the aggregate will not be permitted. F. Storage. The contractor shall provide suitable storage facilities for the asphalt emulsion. The container shall be equipped to prevent water from entering the emulsion. Suitable heat shall be provided if necessary to prevent freezing. G. Sampling. Samples of materials and of the finished slurry surface shall be furnished by the Contractor as directed by the Engineer during progress of the work. Test reports may be requested from the Contractor as additional materials arrive. 4. EQUIPMENT All equipment, tools, and machines used in the performance of this work shall be maintained in satisfactory working order at all times. Descriptive information of the slurry mixing and applying equipment to be used shall be submitted for approval not less than five (5) days before the work starts. A. Slurry Mixing Equipment. The slurry mixing machine shall be a continuous flow mixing unit and be capable of delivering accurately a predetermined proportion of aggregate, water and asphalt emulsion to a revolving spiraled multiblade mixer tank, and to discharge the thoroughly mixed product on a continuous basis. The aggregate shall be prewetted immediately prior to mixing with the emulsion. The multi -blades of the mixing unit shall be capable of thoroughly blending all ingredients together. No violent mixing shall be permitted. The mixing machine shall be equipped with an approved fines feeder that provides an accurate metering device or method to introduce a pre- determined proportion of mineral filler into the mixer at the same time and location that the aggregate is fed. The fines feeder shall be used whenever added mineral filler is a part of the aggregate blend. The mixing machine shall be equipped with a water pressure system and fog type spray bar adequate for complete fogging the surface preceding spreading equipment with a maximum application of 0.05 gallons per square yard. 724 Sufficient machine storage capacity to mix properly and apply a min of five tons of the slurry shall be provided. B. Slurry Spreading Equipment. Attached to the mixer machine shall be a mechanical type squeegee distributor equipped with flexible material in contact with the surface to prevent loss of slurry from the distributor. It shall be maintained so as to prevent loss of slurry on varying grades and crown by adjustments to assure uniform spread. There shall be a steering device and a flexible strike -off. The spreader box shall be adjustable from 8 to 13 feet at any increment. The box shall be kept clean, and build-up of asphalt and aggregate on the box shall not be permitted. C. Cleaning Equipment. Power brooms, power blowers, air compressors, water flushing equipment, and hand brooms shall be suitable for clean- ing the surface and cracks of the old surface. D. Auxiliary Equipment. Hand squeegees, shovels, and other equipment shall be provided as necessary to perform work. 5. PREPARATION OF SURFACE Immediately prior to applying the slurry, the surface shall be cleaned of all loose material, silt, spots, vegetation, and other objectionable material. Any standard cleaning method used to clean pavements will be acceptable except water flushing will not be permitted in areas where considerable cracks are present in the pavement surface. The Engineer shall give final approval of the surface. 6. COMPOSITION AND RATE APPLICATION OF THE SLURRY MIX The amount of asphalt emulsion to be blended with the aggregate shall be that as determined by the laboratory report after final adjustment in the field. A minimum amount of water shall be added as necessary to obtain a fluid and homogenous mixture. 7. TRAFFIC CONTROL WILL BE THE RESPONSIBILITY OF THE CONTRACTOR The following traffic requirements, will be rhe responsibility of the contractor: Suitable methods such as barricades, flagmen, pilot cars, etc., shall be used to protect the uncured slurry surface from all types of traffic. Any damage to the uncured slurry will be the responsibility of the Contractor. The Engineer (or Contracting Officer) shall give final approval as to the method used. If damage occurs where suitable means have been made to protect the uncured slurry, violators will be prosecuted and the Contractor will be reimbursed for the amount of the damages by the violator. 8. APPLICATION OF THE SLURRY SURFACE A. General. The surface shall be fogged with water directly preceding the spreader. The slurry mixture shall be of the desiked consistency when deposited on th6 surface and no additional elements shall be added. Total time of mixing shall not exceed four minutes. A sufficient amount of slurry shall be carried in all parts of the spreader at all times so that complete coverage is obtained. No lumping, balling, or unmixed aggregate shall be permitted. No segregation of the emulsion and aggregate fines from the coarse aggregate will be permitted. If the coarse aggregate settles to the bottom of the mix, the slurry will be removed from the pavement. No excessive breaking of the emulsion will be allowed in the spreader box. No streaks such as caused by oversixed aggregate will be left in the finished pavement. B. Joints. No excessive build up nor unsightly appearance shall be permitted on longitudinal or transverse joints. The use of burlap drags or other type drags shall be approved by the Engineer. C. Hand Work. Approved squeegees shall be used to spread slurry in non -accessible areas to the slurry mixer. Care shall be exercised in leaving no unsightly appearance from hand work. D. Curing. Treated areas will be allowed to cure until such time as the Engineer permits their opening to traffic. 9. MEASUREMENT AND PAYMENT The bituminous slurry surface shall be measured and paid for by the square yard of work completed and accepted as designated by the Engineer. The successful bidder must submit complete specifications and literature for goods or services offered. Each bidder must state the approximate time required for delivery after the execution of a contract. All amounts bid should be f.o.b. Paducah and contain all applicable taxes. SECTION 2. The City Manager shall advertise for sealed bids by notice posted up at the City Hall door and by publication pursuant to I,MS Chapter 424. No bid shall be opened within ten dayp from the date on which this resolution is adopted, and no bid shall be received after the hour fixed for the opening of bids. All bids received by the City Manager up to the time for opening of same shall be filed with the Board of Commissioners who may let a contract to the lowest responsible bidder. The City shall have the right to refuse and reject any and all bids. SECTION 3. This resolution shall be in full force and effect from and after its adoption. Mayor Protem H. E. Fisher, Commissioner i John Hornsby, Commissioner Passed by the Board of Commissioners August 9, 1971 Recorded by Sarah Thurman, City Clerk, August 9, 1971. 725