SECTION AGGREGATE SURFACE COURSE

Transcription

1 SECTION AGGREGATE SURFACE COURSE PART 1 - GENERAL 1.1 SUMMAJlY A. Provide aggregate surface course where shown on the Drawings, and as specified herein. B. Work shall consist of preparing the completed subgrade. It shall include shaping and final compaction of the subgrade material for the construction of the surface course. 1.2 REFERENCES A. Standard Specifications for Highway Construction, 2011, Missouri Department of Transportation (MODOT) herein noted as the Standard Specifications. PART 2 -PRODUCTS 2.1 MATERIALS A. Provide materials in accord with referenced Articles in the Standard Specifications. B. Aggregate: 1. Section 1007-Type 1 PART 3- EXECUTION 3.1 GENERAL A. The entire subgrade shall be prepared by removing all vegetation, filling all depressions, and bringing the surface to grade. Soft and unsuitable material that will not compact when rolled or tamped shall be processed as described below or removed, disposed and replaced with suitable material. B. The subgrade shall be compacted to 98 percent of standard proctor density. C. In cut sections the Contractor shall take the following steps to obtain not less than 98% of the standard proctor density in the subgrade. 1. Step 1 - Cut plan ditches which are to drain the area at least two weeks prior to Step 2 2. Step 2 - Air dry the top 8" of the sub grade. This procedure shall include at least two 8" depth processings utilizing discs or tillers each day for three consecutive days. 3. Step 3 - Recompact the layer processed in Step 2 to achieve the required density or until a roller which has the ability to obtain the density has made at least 9 passes over the area. D. In subgrade areas that cannot be stabilized by proofrolling, reworking, drying and recompaction overexcavation and replacement with coarse crushed stone should be used as necessary. Alternatively, a stabilizing geogrid such as Tensar TX 140 may be used to AGGREGATE SURFACE COURSE C

2 increase subgrade stability where necessary. It should be noted that the reworked loess subgrade tends to pump excessively at moisture contents at and above optimum. If geogrid is used for stabilization, the aggregate base thickness will need to be at least 6" in order to prevent it from popping thru the aggregate base. If the sub grade does not meet the density requirements after processing, the Engineer shall be notified to determine how the density shall be obtained. Work completed after processing to obtain a satisfactory subgrade density in an area shall be paid for as Extra Work. 3.2 AGGREGATE SURFACE A. General: The subgrade shall be constructed so that after being compacted, it will conform to the alignment, grade and cross section shown on the plans prior to placement of the Aggregate Surface Course. B. The aggregate surface shall be constructed to the thickness shown on the plans. The aggregate shall be placed such that the required amount of material will be deposited uniformly along the central portion of the roadbed and spread to the proposed cross section. The aggregate surface course should be compacted to at least 98% of the standard proctor maximum dry density within a moisture content range of ±3% of optimum. When the constructed thickness is less than 90% of the thickness shown on the plans, aggregate shall be added to obtain the required thickness. 3.3 FIELD QUALITY CONTROL A. The Contractor shall provide testing services of a soils engineer and/or independent laboratory approved by the Owner. B. Upon completion of each test and/or inspection, promptly distribute copies of test or inspection reports to the A/E. C. Testing Requirements: 1. Standard Proctor Density/Moisture (ASTM D 698): a. 1 per each source of material. 2. Field density/moisture tests (ASTM D6938): a. 1 per 5000 sq ft per lift. END OF SECTION AGGREGATE SURFACE COURSE C

3 SECTION PORTLAND CEMENT CONCRETE SITE WORK PART 1 - GENERAL 1.1 SUMMARY A. Provide portland cement concrete pavements, curbs and sidewalks where shown on the Drawings, and as specified herein. 1.2 SUBMITTALS A. Comply with pertinent provisions of submittals and substitutions sections. B. Product information: 1. Concrete Mix Design. 2. Certifications of material compliance for: a. Reinforcement. b. Paving Fabric. C. Aggregate base and concrete test reports 1.3 REFERENCES A. Missouri Standard Specifications for Highway Construction, 2011, Missouri Department of Transportation herein noted as the Standard Specifications. PART 2 - PRODUCTS 2.1 MATERIALS A. Provide materials in accord with referenced Articles the Standard Specifications. B. Aggregate Base Course: 1. Sections 304 & Type 1 aggregate. C. Portland Cement Concrete: 1. Sections 501 & 502, Pavement Concrete. D. Reinforcement shall comply with the following minimums: 1. Bars: ASTM A6115, Grade 60 unless otherwise noted on the Drawings, using deformed bars for #3 and larger. 2. Welded Wire Fabric: ASTM A Bending: ACI 318. E. Pavement-Marking Paint: Latex, waterborne emulsion, lead and chromate free, ready mixed, complying with FS TT-P-1952, with drying time of less than 45 minutes. The Architect/Engineer shall approve the paint manufacturer. PORTLAND CEMENT CONCRETE SITE WORK C1408-0l

4 1. Color: Yellow PART 3 -EXECUTION 3.1 GENERAL A. This work shall consist of the construction of Portland Cement Concrete pavements, driveways, curbs, gutters, and sidewalks. 3.2 SUBGRADE PREPARATION A. Prepare subgrade as specified in Section AGGREGATE BASE COURSE A. General: The Type 1 aggregate base course shall be constructed in layers not more than 4 inches thick when compacted, except that if tests indicate that the desired results are being obtained, the compacted thickness of any layer may be increased to a maximum of 8 inches. When placed, it shall be free from segregation and shall require minimum blading or manipulation. Immediately after the material has been placed, it shall be compacted with a tamping roller, a vibratory machine or combination of the two. B. Compaction: Before the aggregate is deposited on the subgrade, it shall contain the amount of moisture required for compaction. The aggregate base course should be compacted to at least 98% of the standard proctor maximum dry density within a moisture content range of ±3% of optimum. In subgrade areas that cannot be stabilized by proofrolling, reworking, drying and recompaction overexcavation and replacement with coarse crushed stone should be used as necessary. Alternatively, a stabilizing geogrid such as Tensar TX 140 may be used to increase subgrade stability where necessary. It should be noted that the reworked loess subgrade tends to pump excessively at moisture contents at and above optimum. If geogrid is used for stabilization, the aggregate base thickness will need to be at least 6" in order to prevent it fi om popping thru the aggregate base. 3.4 PORTLAND CEMENT CONCRETE PAVEMENT A. Comply with Sections: Accelerating Admixtures a. The use of calcium chloride shall not be permitted Description Materials. a. Epoxy coating of tie bars, dowel bars, reinforcement bars, and chair supports is required Equipment Batching, Plant, Mixer, and Hauling Equipment Slip Form Construction Consolidating and Finishing Equipment. PORTLAND CEMENT CONCRETE SITE WORK Cl408-0l

5 a. The pavement may be finished utilizing the vibrating screed method. Longitudinal floating may be completed using the hand method. The final finish shall be obtained using a burlap drag or medium stiffness broom Forms Vibrators Concrete Saw Equipment for Sealing Joints. a. The top Y4 inch of all expansion joints and pavement joints (excluding tooled joints) shall be sealed with a self-leveling polyurethane horizontal sealant complying with ASTM C920, Type M, Grade P, Class Auxiliary Equipment Construction Requirements Joints. a. Sidewalk Joints: Tool edges and joints in concrete after initial floating with an edging tool to a 1/4-inch radius. Repeat tooling of edges after applying surface finishes. Eliminate tool marks on concrete surfaces Curing Removing Forms Surface Test. a. The surface shall be tested with a 10-foot straightedge. Any deviation greater than 3/16" in 1 0 feet shall be corrected at the Contractor's expense Quality Assurance Removal of Material. 3.5 CONCRETE PROTECTION A. A.All concrete pavements, sidewalk and curb and gutters shall be treated with "Aquron 2000" concrete preservative treatment, or equal product. 3.6 CONCRETE CURB AND GUTTERS A. Comply with applicable provisions of Section Epoxy coating of tie bars is required. 3.7 PAVEMENTMARKINGS A. Preparation: The pavement surface shall be dry and free of dirt or grease. Clean if necessary. B. Installation: Paint shall not be applied at air temperatures below 40 F unless approved by the A/E. Paint shall be applied at a minimum thickness of 16 mils and beads applied to all traffic control markings other than curbs, parking stall lines and cross hatched areas. Pavement marking words and symbols shall be as detailed in the Drawings. PORTLAND CEMENT CONCRETE SITE WORK C1408-0l

6 3.8 FIELD QUALITY CONTROL A. The Contractor shall provide testing services of a soils engineer and/or independent laboratory approved by the Owner. B. Upon completion "Of each test and/or inspection, promptly distribute copies of test or inspection reports to A/E. C. Aggregate Base Testing Requirements: 1. Standard Proctor Density/Moisture (ASTM D 698): a. 1 per each source of material. 2. Field density/moisture tests (ASTM D6938): 3. 1 per 5000 sq ft per lift. D. Concrete Tests: Testing of composite samples of fresh concrete obtained according to ASTM C 172 shall be performed according to the following requirements: 1. Testing Frequency: Obtain one composite sample for the ftrst 5 cu. yd. placed each day, plus one set for each additional 50 cu. yd. placed. 2. Slump: Required 2"-4" - ASTM C 143/C 143M; one test at point of placement for each composite sample of each concrete mixture. Perform additional tests when concrete consistency appears to change. 3. Air Content: Required 6% (-1%, +2%) - ASTM C 231, pressure method, for normal-weight concrete; ASTM C 173/C 173M, volumetric method, for structural lightweight concrete; one test for each composite sample of each concrete mixture. 4. Concrete Temperature: ASTM C 1 064/C 1 064M; one test per truck when air temperature is 35 deg F and below and when 85 deg F and above. 5. Unit Weight: ASTM C 567, fresh unit weight of structural lightweight concrete; one test for each composite sample of each concrete mixture. 6. Compression Test Specimens: ASTM C 31/C 31M. a. Cast and laboratory cure one set of four (4) standard 6" x 12" or 4" x 8" cylinder specimens for each composite sample. b. Cast and fteld cure one additional standard cylinder specimen for each composite sample for cold or hot weather concrete. 7. Compressive-Strength Tests: ASTM C 39/C 39M; a. If 6" x 12" cylinders are taken: test one of four laboratory-cured specimens at 7 days and one set of two specimens at 28 days. The forth specimen will be a hold to serve as a spare if specimens do not reach their design strengths. b. If 4" x 8" cylinders are taken: test one of ftve laboratory-cured specimens at 7 days and one set of three specimens at 28 days. The ftfth specimen will be a hold to serve as a spare if specimens do not reach their design strengths. PORTLAND CEMENT CONCRETE SITE WORK Cl408-0l

7 3.9 REPAIRS AND PROTECTION c. A compressive-strength test shall be the average compressive strength from a set of two or three specimens obtained from same composite sample and tested at age indicated. A. Remove and replace concrete pavement that is broken, damaged, or defective or that does not comply with requirements in this Section. B. Protect concrete from damage. Exclude traffic from pavement for at least 14 days after placement. C. Maintain concrete pavement free of stains, discoloration, dirt, and other foreign material. Sweep concrete pavement not more than two days before date scheduled for Substantial Completion inspections. END OF SECTION PORTLAND CEMENT CONCRETE SITE WORK Cl408-0l

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9 SECTION TURF AND GRASSES PART 1 - GENERAL 1.1 SUMMARY A. Furnish all materials, labor, equipment and services necessary to perform all Work. B. Work included in this Section includes clearing of weeds, seed bed preparation, installation of erosion control fabric and seeding operations required for seeding of the areas shown on Drawings. 1.2 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions, Division Specification sections, and the Approved DNR Land Disturbance Permit, apply to the Work specified in this Section. 1.3 SUBMITTALS A. Manufacturers or vendor's certified analysis for soil amendments and fertilizer materials. B. Certification of seed mixture. 1.4 SCHEDULING A. Planting seasons shall be as follows: 1. Seeding shall be performed, preferably in the fall from September 1 to October 15. Spring seeding may occur March 1 to April DELIVERY, STORAGE, AND HANDLING A. Packaged Materials: Deliver packaged materials in containers showing weight, analysis, and name of manufacturer. Protect materials from deterioration during delivery and while stored at the project site. 1.6 QUALITY ASSURANCE A. General: Ship landscape materials with certificates of inspection required by governing authorities. Comply with regulations applicable to landscape materials. B. Analysis: Package standard products with manufacturer have certified analysis JOB CONDITIONS A. Utilities: Determine location of underground utilities and perform work in a manner which will avoid possible damage. Hand excavate as required. B. Excavation: When conditions detrimental to plant growth are encountered, such as rubble fill, adverse drainage conditions, or obstructions, notify the Architect/Engineer before planting. TURF AND GRASSES C1408-0l

10 1.8 RELATED WORK A. Section Excavation and Fill. 1.9 REFERENCES A. U.S. Department of Agriculture: SRA 156 U.S. Department of Agriculture, Rules and Regulations under the Federal Seed Act. B. American Joint Committee on Horticultural Nomenclature Standard: 1942 Edition Standardized Plant Names. PART 2- PRODUCTS 2.1 FERTILIZER A. Fertilizer shall be uniform in composition, free-flowing, suitable for application with approved equipment and delivered to the site unopened in original containers each bearing the manufacturer's guaranteed analysis and in conformity with state fertilizer laws. Fertilizer shall contain the following minimum percentage of plant food by weight percent available nitrogen percent available phosphoric acid percent available potash B. Fertilizer application rates shall be 600 pounds per acre, or as recommended by soils analysis. C. Invoices for fertilizer shall show grade furnished. Upon acceptance of the seeded areas, a final check of total quantities of fettilizer used will be made against total area seeded and if minimum rates of application or specified quantities have not been met, the Architect will require distribution of additional quantities of these materials to make up minimum application specified. 2.2 MULCH A. Straw: Provide straw for an application rate of 2 tons per acre. Straw shall be crimped in place. 2.3 EROSION CONTROL BLANKETS A. Blankets: Biodegradable wood excelsior, straw, or coconut-fiber mat enclosed in two layers of photodegradable plastic mesh. Include manufacturer's biodegradable stakes, 6 inches long. 2.4 GRASS SEED A. General: Provide grass seed, which is: 1. Free from primary noxious weed seeds, and re-cleaned. 2. Certified test results from each lot of seed. B. Mixture: TURF AND GRASSES C1408-0l

11 1. All seed shall be furnished in sealed, standard containers, unless otherwise approved. Seed which has become wet, moldy, or otherwise damaged will not be acceptable. 2. Each container of seed shall be fully labeled in accordance with the Federal Seed Act and seed certifications shall be signed and made part of seed invoices. 3. Seed shall be Fescue, 97 percent pure live seed 4. Invoices and tags for seed shall show type furnished. Upon acceptance of the seeded areas, a final check of total quantities of seed used will be made against total area seeded and if minimum rates of application or specified quantities have not been met, the Architect will require distribution of additional quantities of these materials to make up minimum application specified. C. Seed and fertilizer applications may be modified to suit weather and soil condition at the time of seeding. D. Seeding Rate: The seeding rate shall be 8-10 lbs. /1000 sq. ft. for new lawns and 3-4 lbs. /1000 sq. ft. for overseeding existing lawn areas. PART 3 -EXECUTION 3.1 GENERAL A. All proposed earthen areas and earthen areas disturbed during construction shall be revegetated. 3.2 GROUND PREPARATION A. General: the ground areas are to be seeded and fertilized as indicated on the Drawings and/or as specified herein. Equipment necessary for the proper preparation of the ground surface and for handling and placing all required materials shall be on hand, in good condition and shall be approved before the Work is started. B. Clearing: Prior to tillage, seeding or other specified operations, all vegetation which might interfere with the indicated treatment of the areas shall be mowed, grubbed, raked and the debris removed from the site. Prior to or during grading and tillage operations, the ground surface shall be cleared of materials which might hinder final operations. Areas which have been disturbed shall be finish graded and/or developed as indicated on the Drawings or as specified. C. Tillage: After the areas required to be seeded have been brought to the finish grades as specified, they shall be thoroughly tilled to a depth of at least 6 inches by plowing, disking, harrowing or other approved methods until the condition of the soil is acceptable to the Architect. Work shall be performed only during period when beneficial results are likely to be obtained. When conditions are such by reason of drought, excessive moisture, or other factors that satisfactory results are not likely to be obtained, Work shall be stopped. Work shall be resumed only when desired results are likely to be obtained. D. Leveling: Any undulations or irregularities in the surface resulting from tillage, fertilizing or other operations shall be leveied with a float drag before seeding operations are begun. TURF AND GRASSES Cl408-0l

12 E. Fertilizing: Fertilizer shall be distributed uniformly at the rate previously specified per 1,000 square feet over the areas to be seeded and shall be incorporated into the soil to a depth of at least 3 to 4 inches by disking, harrowing or other approved methods. The incorporation of fertilizer may be a part of the tillage operation hereinbefore specified. Distribution by means of an approved seed drill equipped to sow seed and distribute fertilizer at the same time will not be accepted. Fertilizer shall be incorporated into the soil a minimum of 10 days before seed is planted. F. Inspection: A minimum of 48 hours prior notice must be given to the Construction Administrator before fertilizing may commence. G. Planting Time: All seeding Work shall be done between the dates of April 1 to May 15 for spring planting and from August 15 to October 15 for fall planting except as otherwise directed in writing by the Construction Administrator. H. Planting Condition: No planting shall be done until a permanent source of water is available at the site for use by the Owner. 3.3 SEEDING A. General: Prior to seeding, any previously prepared seedbed areas compacted or damaged by interim rains, traffic, or other cause shall be reworked to restore the ground condition previously specified. Seed shall be planted by drill seeding. B. Drill Seeding: Seed shall be uniformly drilled to an average depth of Yz inch and at the rate of 8 pounds per 1,000 square feet using equipment having drills not more than 6 Yz inches apart. Row markers shall be used with the drill seeder. C. Rolling: Immediately after seeding, except for slopes 3 horizontal to 1 vertical and greater, the entire area shall be firmed with a roller not exceeding 90 pounds for each foot of roller width. Do not roll areas seeded with seed drills equipped with rollers. D. Inspection: A minimum of 48 hours prior notice must be given to the Construction Administrator before seeding may commence. 3.4 INSTALLATION OF EROSION CONTROL FABlUC A. Fabric shall be rolled out in place. Fabric shall be applied without stretching and shall lie smoothly but loosely on the soil surface. The Contractor shall refer to the Drawings for details of fabric fastening. B. Application of the erosion control fabric shall occur the same day that the seeding of an area has taken place. C. Fabric shall completely cover slopes of 1 :3 or greater and other areas shown on the Drawings to be protected from erosion. After fabric installation, the entire area shall be rolled with a smooth roller weighing between 200 to 250 pounds. After rolling, the fabric shall be in intimate contact with the soil surface at all points. Any clods, etc., which hold the fabric off the ground should be removed. The fabric shall be forced down into any depressions and held there with a staple. TURF AND GRASSES C1408-0l

13 3.5 MAINTENANCE A. General: The project areas shall be kept clean at all times and care shall be taken that use of the premises shall not be unduly hampered by Work herein specified. The intent of this Section is to ensure a healthy, well-established turf, and prevent soil erosion in compliance with the Land Disturbance Permit issued by the Missouri Department of Natural Resources. B. Responsibility: The Owner shall be responsible for maintenance of all seeded areas upon completion of seeding and general acceptance by the Construction Administrator. C. Damage: Damage to seeded areas during the project shall be repaired by the persons responsible for causing such damage. 3.6 CLEANUP AND PROTECTION A. Clean pavement and other site areas containing debris resulting from the seeding operations. B. Protect existing site elements from damage due to seeding operations. Protect seeded areas from damage by operations of other contractors and trespassers. Maintain protection during installation and the maintenance period. Treat, repair, and/or replace damaged areas. 3.7 INSPECTION AND ACCEPTANCE A. The Construction Administrator shall make an inspection of the seeded areas upon completion of seeding. Seeded areas shall be considered acceptable if the specified quantities of fertilizer & seed have been properly applied. 3.8 GUARANTEE A. The Contractor is responsible for the proper application of the fertilizer & seeding. Watering, weeding, re-seeding, and mowing will be the responsibility of the Owner after proper application of the seed. END OF SECTION TURF AND GRASSES Cl408-01

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