SPECIFICATIONS FOR CAST-IN-PLACE CONCRETE SLAB DUNN COUNTY TRANSFER STATION MENOMONIE, WISCONSIN 1. SUMMARY A. Work includes: 1. Pavement removal, topsoil stripping, and site grading for concrete slab. 2. Furnishing and installing cast-in-place concrete slab. 3. Topsoiling, fertilizing, seeding, and mulching to restore disturbed areas adjacent to new concrete slab. B. The following work will be performed by others: 2. DEFINITIONS 1. Furnishing, installing, and maintaining erosion control measures at the site. A. References to "WIDOT Std. Spec." shall mean Wisconsin Dept. of Transportation, Standard Specifications for Highway and Structure Construction, latest edition, including current Supplemental Specifications. B. References to "Owner" shall mean Dunn County. C. References to "Engineer" shall mean Ayres Associates. 3. PERMITS AND CODES A. Provide all necessary permits, approvals, and licenses and pay all fees, taxes, and royalties, unless otherwise indicated. Comply with local and municipal ordinances and applicable state and national codes. 4. COORDINATION A. Additional construction is being performed by others at the transfer station site. Contractor shall coordinate its construction schedule with other contractors at the site. B. Cast-in-place concrete slab is intended to have precast concrete bunker panels installed in a specific configuration. C. Obtain Owner or Engineer approval for cast-in-place concrete slab dimensions, orientation, and location. 5. WORK HOURS A. Work shall be conducted between the hours of 7:00 a.m. and 6:00 p.m. on normal work days, unless approved for unusual circumstances. B. The hours of operation of the Dunn County Transfer Station are 5:30 a.m. to 4:00 p.m. The public is allowed at the facility on Mondays from 6:30 a.m. to 4:30 p.m., Wednesdays from 4:00 p.m. to 7:00 p.m., and Saturdays from 7:00 a.m. to noon. Page 1 of 5
6. SUBMITTALS A. Submit the following to Engineer for review prior to fabrication, delivery, or execution of the applicable work: 1. Three copies of slab dimension and reinforcement shop drawings. 2. Two copies of concrete job mix. 3. Three copies of chemical hardener product data. B. Submit the following to Engineer after completion of the applicable work: 1. One copy of delivery ticket for each load of concrete delivered to project. C. Submittals for proposed products shall not be used in the work unless they have been reviewed and bear the stamp and signature of Engineer. Submittals will only be reviewed for general conformance with the design concept of the project and general compliance with the information given in the Contract Documents. Contractor shall be responsible for confirming and correlating all quantities and dimensions, selecting fabrication processes and techniques of construction, coordinating his or her work with that of all other trades, and performing all work in a safe and satisfactory manner. Corrections or comments made on submittals shall not relieve Contractor from compliance with requirements of Drawings and Specifications and shall not be considered an order for extra work. 7. TESTING A. Concrete: Engineer may perform tests to verify that concrete slump, air content, temperature, and strength meet specified requirements. However, these tests are not intended to provide Contractor with information he may need to assure that materials and workmanship meet requirements of specifications, and their performance will not relieve Contractor of responsibility of performing his own tests for that purpose. 8. VERIFICATION OF CONDITIONS A. Verify grades, lines, levels, locations, and dimensions, as shown, and inspect surfaces that are to receive work before proceeding. Contractor shall be solely responsible for accuracy of measurements and laying out of its work. Notify Engineer in writing in case of unsuitable conditions, defective substrates, or discrepancies in Contract Documents. Starting of work shall imply acceptance of conditions. 9. PROTECTION A. Protect improvements on site and on adjoining properties. Provide barricades, coverings, or other types of protection as necessary to prevent damage and to safeguard against injury. Restore to original condition improvements damaged by the work or improvements which required temporary removal during construction. 10. TRAFFIC CONTROL A. Furnish and maintain construction barricades and traffic control devices when working in areas open to traffic. Barricades and traffic control devices shall comply with Wisconsin Manual on Uniform Traffic Control Devices. 11. UTILITIES A. Contractor shall notify all utilities that might have facilities in project area at least three working days in advance of starting construction. Have underground facilities located and flagged prior to beginning work. Page 2 of 5
12. DEMOLITION A. Remove pavements and other improvements within construction limits as shown and as required for construction. B. Saw cut existing surfacing to provide a straight, vertical joint. 13. TOPSOIL STRIPPING A. Strip topsoil from project area to whatever depths encountered; prevent intermingling with underlaying subsoil or other objectionable material. Remove heavy growths of grass from areas before stripping topsoil. B. Stockpile topsoil in storage piles in areas as designated by Engineer. Construct storage piles to freely drain surface water. Cover or sprinkle water on storage piles to prevent windblown dust. 14. GRADING A. Excavate to achieve necessary dimensions, extending a sufficient distance from construction as required for bracing, supports, concrete formwork, and other required construction. B. Subbase for concrete slab shall be select soils complying with ASTM D247 soil classification group GW (well-graded gravel), GP (poorly-graded gravel), SW (well-graded sand), or SP (poorly-graded sand). Aggregate shall pass a 1-1/2 in. sieve and not more than 35% shall be retained on a No. 10 sieve. Maximum of 5% by weight shall pass a No. 200 sieve. On-site soils are not approved for concrete slab subbase material. C. Subgrade and subbase for concrete slabs shall be compacted to 92% of Modified Proctor density, ASTM D1557. 15. CAST-IN-PLACE CONCRETE SLAB A. Products: 1. Cement: Portland cement, ASTM C150, Type I. 2. Aggregates: Fine and coarse aggregates, ASTM C33, consisting of clean, hard, durable sand and crushed rock, crushed gravel, or gravel. Coarse aggregate shall meet grading requirements for size number 67, 57, or 467. Maximum coarse aggregate size for each class of concrete shall be as indicated in schedule below. Ratio of coarse aggregate to fine aggregate shall not be less than 1:1 nor more than 2:1. 3. Water: Mixing water shall be potable, free of oil, acid, excessive alkalinity, organic matter, and salts. 4. Admixtures: Air-entrained admixture shall conform to ASTM C260. Other admixtures which do not adversely affect strength and durability of concrete may be used with permission of A/E, if used in strict accordance with manufacturer's instructions. Care shall be exercised to assure that the admixture does not increase or decrease air content outside of allowable limits. Do not use salt or chemical anti-freeze admixtures. 5. Integral Concrete Hardener: Dry-powder material added integrally to concrete mix to provide hardness and increased durability; Cementec "Hard-Cem", or approved equal. 6. Reinforcing Steel: ASTM A615, Grade 60, new billet steel bars. 7. Welded Wire Fabric: ASTM A185, welded steel wire fabric. 8. Moisture-Retaining Cover: Waterproof paper, polyethylene film, or polyethylene-coated burlap complying with ASTM C171. 9. Curing Compound: Liquid membrane curing compound; ASTM C309, Type 2, white pigmented. Page 3 of 5
B. Concrete Mixture: 1. Concrete mix shall meet the following minimum requirements: Min. Comp. Min. Max. Air Strength Max. Cement, Water- Content, @ 28 days, Max. Agg. Bags/ Cement % By Class p.s.i. Slump Size C.Y. Ratio Volume AA 4500 3-1/2" 3/4"* 6-1/2 0.45 5-7%* * 1-1/2" max. aggregate size may be used if allowed by ACI 318. If used, air-entrainment shall be 4-6%. 2. Add integral concrete hardener to concrete mix at hardener manufacturer's recommended rate. 3. Prepare design mix of concrete on the basis of compressive strength by methods recommended in ACI 318. Use an independent materials laboratory for preparing and reporting proposed mix design. C. Preparation: 1. Wet forms with light oil. 2. Sprinkle subgrade with water. D. Joints: 1. Provide contraction (control) joints in slabs-on-grade to form panels of patterns as shown. 2. Form contraction joints by inserting 1/4 in. x 1/4 slab depth premolded plastic, hardboard, or fiberboard strip into fresh concrete until top surface of strip is flush with slab surface. Tool slab edges round on each side of insert. After concrete has cured, remove inserts and clean groove of loose debris. 3. Contraction joints may be formed by 1/8 in. x 1/4 slab depth saw cuts. Saw joints prior to formation of shrinkage cracks; achieve an even crisp joint. E. Mixing Concrete: 1. "Ready-mix" concrete shall be produced, delivered and handled in accordance with ASTM C94. Concrete shall be deposited at job site within one hour after introduction of water in mix. Care shall be taken in transferring concrete from truck or mixer to avoid segregation of aggregates in mixture. F. Placing Concrete: 1. Deposit concrete in a manner requiring as little rehandling as possible. Necessary hand spreading shall be done with shovels; do not use rakes. Workers shall rinse dirt from boots before walking in green concrete. 2. Placing shall be continuous between transverse joints without intermediate bulkheads. In case of temporary shutdown, concrete at unfinished end of slabs shall be covered with wet burlap. When delays are unavoidable and of such length that concrete will attain initial set, and in any event where an interruption in concrete placing operations of more than 30 minutes occurs, a joint shall be installed. 3. Provide sufficient spading, rodding, and mechanical vibrating to insure concrete flow into corners and places where concrete will not readily flow. Water-tightness and absence of honeycomb is required for acceptance. 4. Rock pockets or voids found after forms are removed shall be filled immediately with a well-mixed grout composed of one part of Portland cement and three parts of fine aggregate finished to true surface of concrete. Page 4 of 5
G. Finishing: 1. Thoroughly float surface after concrete has been struck off. Give surface a lightly broomed finish with grain perpendicular to direction of travel. 2. Edges shall be neatly trimmed with 1/4 in. radius edging tool. Honeycombed areas shall be pointed with mortar. H. Curing: 16. SEEDING 1. Protect freshly placed concrete from premature drying and excessive cold or hot temperatures. Cure concrete using moisture-retaining cover for seven days or until 75 percent of the required 28-day compressive strength is obtained, whichever is less. 2. Methods may include plastic sheets, constant wetting of surface with water, curing paper, or commercial curing compound. Apply curing compound at not less than 200 sq ft per gal in accordance with manufacturer's recommendations. A. Turf areas disturbed by construction shall receive minimum 4 in. of salvaged topsoil, fertilizer, lime, seed, and mulch. B. Materials and construction methods shall be as follows: 1. Salvaged topsoil shall be placed in accordance with WIDOT Std. Spec., Section 625. 2. Fertilizer and lime shall be in accordance with WIDOT Std. Spec., Section 629, Type A. 3. Seed shall be in accordance with WIDOT Std. Spec., Section 630, Mixture No. 40. 4. Mulch shall be in accordance with WIDOT Std. Spec., Section 627. C. At Contractor's option, seeding may be performed by hydroseeding with mulch and tackifying agent included in mixture. 17. DISPOSAL A. Dispose of excess soil materials on-site in a manner and location as approved by Owner. B. Remove from Owner's property and legally dispose of trash, debris, and waste materials. END OF SECTION Page 5 of 5