Div2 ODOT Specs.pdf

Ohio Army National Guard Regional Training Institute 6 April 2009 Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction Solicitation Number: W91364 09-B-0004

ITEM 206 (ODOT) CHEMICALLY STABILIZED SUBGRADE1

1.1 DESCRIPTION

A. This work consists of constructing a chemically stabilized subgrade using the method specified, which will either be cement stabilized subgrade (CSS) or lime stabilized subgrade (LSS), including designing the percentage of chemical in the stabilized subgrade.

B. The Contract Documents will contain an estimated quantity for the specified chemical for the project, based on using 6 percent for cement and 5 percent hydrated lime, per dry unit weight of a soil weighing 110 pounds per cubic foot (1760 kg/m3).

2.1. MATERIALS

A. When CSS is specified, furnish Portland cement conforming to the requirements of ODOT 701.04.

B. When LSS is specified, furnish hydrated or quick lime conforming to ODOT 712.04.B.

C. Furnish water conforming to ODOT 499.02. Potable water is satisfactory.

D. For Curing Coat furnish ODOT 702.04 Emulsified Asphalts, Types RS-1 or RS-2, or the curing materials specified in ODOT 451.02.

3.1 LIMITATIONS

A. Perform chemical stabilization work when the air temperature is 40 °F or above and when the soil is not frozen.

B. Do not perform this work during wet or unsuitable weather.

4.1 TEST ROLLING

A. Test-roll prior to chemical stabilization with a proof roller conforming to ODOT 204.06.

5.1 CONSTRUCTION

A. Spreading.

1. Prepare a report denoting the type of equipment to be used, speed of the intended equipment usage, rate of application of the chemical, and calculations to produce the required percent of chemical. Submit this report to the Engineer 7 working days prior to the work for acceptance.

2. Shape the subgrade to the approximate profile grade prior to spreading the specified chemical so as to permit the construction of a uniform compacted course of chemically treated soil to the thickness shown on the plans. The addition of the specified chemical will raise the subgrade profile approximately 1 inch. Remove this excess material during the fine grading.

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

3. Use the following spreading percentage rates for the specified chemical. This percentage is based on a dry unit weight of soil of 110 pounds per cubic foot:

Cement 6 percent Lime - Hydrated 5 percent Lime - Quick 4 percent

4. Spread the specified chemical uniformly on the subgrade using a mechanical spreader at the approved rate and at a constant slow rate of speed.

5. Use a distribution bar with a maximum height of 3 feet above the subgrade. Use a canvas shroud that surrounds the distribution bar and extends to the subgrade.

6. Minimize dusting when spreading the specified chemical.

7. Do not spread the specified chemical on standing water.

8. Do not apply the specified chemical if wind conditions are such that blowing cement or lime exceeds the limits in ODOT 107.19.

B. Mixing. Immediately after spreading the specified chemical, mix the soil and chemical, as follows.

1. CSS

a) Mix the cement and soil using a power driven transverse type mixer equipped with a computer controlled volumetric water read out. Continue mixing until the cement is thoroughly incorporated into the soil and is a uniform color.

b) Do not water during the initial mixing.

c) Complete the initial mixing, so that 80 percent of the soil cement mixture passes a No.

4 sieve and 100 percent passes the 1 inch sieve, exclusive of aggregate larger than the No. 4 sieve size.

d) Following the initial mixing, remix the soil and introduce water through the transverse mixer to bring the mixed material to at least optimum moisture. Uniformly distribute the water in sufficient quantity to hydrate the cement.

e) If the cement can be mixed to the required gradation and the water can be added to the CSS to bring the CSS to the required moisture content, then one mixing of the soil, water and cement may be used.

f) Restrict the addition of water when moisture content of soil exceeds 3 percent above optimum. Add water to the mixed soil in less than 2 hours after the initial mixing.

g) Once the water is added to the mixture, complete the mixing, compacting, and shaping within 2 hours from start to finish.

2. LSS

a) Mix the lime and soil by using an approved power driven rotary type mixer. If necessary, add water to bring the mixed material to at least optimum moisture content for hydrated lime and to at least 3 percent above optimum for quick lime. Continue

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction mixing until the lime is thoroughly incorporated into the soil, all soil clods are reduced to a maximum size of 2 inches, and the mixture is a uniform color.

b) Following the initial mixing, lightly compact the material to seal it against rain or excessive drying by using a steel wheel or pneumatic tire roller.

c) Before final mixing, cure the initially-mixed, lightly-compacted material for a period of not less than 24 hours and not more than 7 days. Perform the initial cure with water.

If conditions during construction are such that more than 7 days elapse between initial mixing and final mixing, add an additional 0.5 percent of lime during the final mixing.

Furnish the additional lime at no cost to the Government.

d) Perform the final mixing using an approved power-driven rotary-type equipment until the soil is completely pulverized with all clods reduced to a maximum size of 1 inch (25 mm) and at least 60 percent of the clods passing the No. 4 sieve, exclusive of aggregate larger than the No. 4 sieve. Continue mixing until the lime is uniformly distributed throughout the pulverized soil.

e) During final mixing, return the mixture to the moisture contents stated above, then shape and compact the mixture.

3. Mixture Depth Check

a) Check the uniformity of the mix by digging trenches or a series of holes at regular intervals for the full depth of treatment and inspecting the color and depth of the exposed material. The Contractor’s Independent Quality Control Testing Firm will use diluted hydrochloric acid or phenolphthalein to ensure that the specified chemical is mixed to the desired depth.

C. Compacting.

1. Start compaction immediately after the shaping and final mixing.

2. Compact all chemically stabilized subgrade to the requirements in ODOT 204.03.

3. The Contractor will obtain the maximum dry density for acceptance by using the moisture density curves submitted by the Contractor’s geotechnical consultant, the Ohio Typical Density Curves, or the maximum dry density obtained by test section method.

4. When a test section method is used for compaction acceptance; use 98 percent of the test section maximum dry unit weight for acceptance of the production chemically stabilized subgrade construction. Use at least the same number of passes and compactive effort used to construct the test section in the production chemically stabilized subgrade areas.

5. Construct a new test section when the material, supporting foundation, or embankment changes.

6. Reduce the moisture content or number of passes, if the material becomes unstable.

7. Use a vibratory footed roller weighing at least 10 tons.

8. Use the moisture controls according to ODOT 203.07.A, except ensure that the moisture content at time of compaction is at or above optimum.

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

9. Perform the final rolling using a steel-wheeled roller. Do not use vibration during the final rolling.

10. Shape the compacted chemically stabilized subgrade to approximately 1 inch above the plan profile grade and typical sections.

11. Do not allow any mixture of chemically stabilized subgrade that has not been compacted and shaped to remain undisturbed for more than 30 minutes.

D. Curing.

1. Immediately following the compaction and shaping of the chemically stabilized subgrade, cover the surface with Curing Coat for curing the chemically stabilized subgrade. Use a rate of 0.3 gallon per square yard for emulsions or a rate of 0.05 gallons per square yard when the curing materials in ODOT 451.02 are used.

2. Apply the Curing Coat prior to the surface drying out. If the Curing Coat is delayed or the surface starts to dry out, indicated by turning white, apply water for temporary curing until the Curing Coat can be applied. Do not apply the Curing Coat unless the Curing Coat can set up before it rains. When the application of Curing Coat must be delayed, keep the chemically stabilized subgrade wet by using water until the Curing Coat can be applied.

3. Cure the chemically stabilized subgrade for at least five days before the placement of the overlying course.

E. Proof Rolling.

1. After the cure period, proof-roll the chemically stabilized subgrade according to ODOT Item

204.

F. Fine Grading.

1. Remove the excess material and fine grade the chemically stabilized subgrade to the profile grade and typical sections within the tolerances in ODOT 203.08. Perform this work after the curing and proof rolling.

G. Protection.

1. Drain and maintain the work according to ODOT 203.04.A.

2. Do not operate any equipment on the chemically stabilized subgrade during the cure period.

3. Do not allow the chemically stabilized subgrade to freeze during the cure period.

4. Cover the completed chemically stabilized subgrade with the aggregate base within 60 calendar days.

6.1 CONTRACTOR DESIGNED CHEMICALLY STABILIZED SUBGRADE

A. Perform design according to Supplement 1120, Mixture Design for Chemically Stabilized Soils.

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

1 The basis for this specification was taken from the 2008 Construction and Material Specifications from the Ohio Department of Transportation, Office of Construction Administration, but it has been modified for project specific issues. Therefore, this specification section shall govern.

END OF ITEM 206

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

ITEM 304 (ODOT) AGGREGATE BASE1

A. This work consists of furnishing, placing, and compacting one or more courses of aggregate including furnishing and incorporating all water required for compacting on a prepared surface.

2.1 MATERIALS

A. Furnish materials conforming to the 2002 Construction and Material Specifications from the Ohio Contractor of Transportation, Office of Construction Administration.

3.1 PRIOR TO SPREADING

A. The Contractor will sample the stockpile to determine the initial moisture content to be used for compaction. The Contractor will develop a moisture-density curve according to Supplement 1015.

B. Use material that is reasonably uniform with moisture. Use a moisture content not less than a minus 4 percent of optimum moisture prior to spreading. Add water to the stockpiles to meet this moisture requirement. Handle the material in a manner to minimize segregation. If segregation occurs, thoroughly mix or re-grade the stockpile.

4.1 SPREADING

A. Spread the material on the prepared surface. Do not spread on frozen material. Do not use frozen material.

B. Do not exceed a compacted lift thickness of 8 inches when using vibratory rollers greater than 12 tons. Do not exceed a compacted lift thickness of 6 inches when using 10 to 12-ton vibratory rollers. Do not exceed a maximum compacted lift thickness of 4 inches when vibratory rollers are not used.

C. Place the material in two or more approximately equal lifts when the specified compacted thickness exceeds 8 inches.

D. Place the material with self-propelled spreading machines capable of placing the material true to line and grade. Spreading machines such as spreader boxes or pavers are allowed. Dozers without spreader boxes or graders may be used but the Contractor shall take in place gradation tests in accordance with Supplement 1090.

E. The Contractor may use hand-placing methods when the total area of the material is 2,000 square yards or less, or in small areas where machine spreading is impractical.

5.1 COMPACTION

A. The Contractor will measure the compaction according to Supplement 1015.

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

B. Add water to the material or dry the material to bring it to within minus 4 percent to plus 2 percent of optimum moisture prior to the compaction operation. Maintain this moisture range during all compaction operations. The Contractor shall determine the percentage of moisture to apply or to be dried from the material. Uniformly apply the water or dry the material throughout the lift and in a manner that does not soften or disturb the lower courses. Reduce the moisture content if the material becomes unstable during the compaction operations.

C. Compact each lift of material immediately after the spreading operations. Depending on the lift thickness used, use vibratory rollers with a minimum weight of 10 or 12 tons (9 to 11 metric tons).

The Contractor may use light rollers or vibratory equipment in small areas as defined in Section D or when heavier rollers are not practical. Approved compaction equipment may consist of vibratory rollers, static rollers, or vibratory equipment.

D. At the beginning of the compaction operation, the Contractor will determine the density requirements by compacting a short test section according to Supplement 1015. Use a minimum compactive effort of eight passes to construct the test section. Use and adjust the vibration on the vibratory rollers to maximize the density and stability.

E. The Government will use 98 percent of the test section maximum dry density for the acceptance of the production material. Use at least the same number of passes and compactive effort used to obtain the test section maximum density for the production material.

F. Construct a new test section when the material changes or when the supporting materials change appreciably.

G. Maintain the surface of each lift during the compaction operations in such a manner that the surface texture is reasonably uniform and the aggregate material is firmly keyed.

H. Provide drainage and maintain the material according to Section D.

6.1 FINISHED SURFACE

A. Ensure that the finished surface does not vary more than 3/8 inch from a 16-foot straightedge parallel to the centerline or more than 1/2 inch from a template conforming to the required cross-section. Furnish straightedges, templates, or other devices satisfactory to the Government, and check the surface for conformance with these requirements.

1 The basis for this specification was taken from the 2008 Construction and Material Specifications from the Ohio Department of Transportation, Office of Construction Administration, but it has been modified for

END OF ITEM 304

AGGREGATE BASE COURSE 304 - 2

Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

ITEM 606 (ODOT) GUARDRAIL1

A. This work consists of constructing or reconstructing guardrail, guardrail posts, bridge terminal assemblies, end terminals, and impact attenuators, including the furnishing, assembling, and erecting of all component parts and materials.

B. Guardrail shall be deep beam rail Type 5, 5A, or 8. Appurtenances shall include bridge terminal assemblies, end terminals, and impact attenuators. Construction of the various types of guardrail include the furnishing, assembling, and erecting of all component parts and materials, complete in place, at the location shown on the plans or as directed, and according to the manufacturer’s recommendations where applicable.

A. Furnish materials conforming to:

Concrete, Class C, F, or S....499 and 511 Reinforcing steel ....................................... 509.02 Deep beam rail and hardware .................. 710.06 Pressure treated guardrail posts and blockouts ........................................... 710.14 Steel guardrail posts ................................. 710.15 Guardrail posts.......................................... 710.16 Galvanizing ............................................... 711.02

B. Use galvanized steel posts, rails, bolts, fittings, and other accessories.

C. For guardrail, use deep beam rail Type 5, 5A, or 8.

3.1 SETTING POSTS

A. Set or drive posts plumb in a manner that prevents battering or distorting of posts. Trim posts that are set or driven more than 1-inch (25 mm) above grade. Treat trimmed posts with a preservative material specified in 712.06. Backfill post holes with acceptable material, placed in layers, and thoroughly compacted.

B. Space Type 5 guardrail posts 6 feet, 3 inches (1.905 m) on center measured along the centerline of the rail and construct with blockouts. Construct each end of Type 5 guardrail barricades without blockouts and with a flared end section.

C. Space Type 5A guardrail posts 3 feet, 1½ inches (953 mm) on center measured along the centerline of the rail and construct with blockouts. Construct each end of Type 5A guardrail barricades without blockouts and with a flared end section.

D. Space Type 8 guardrail posts 6 feet, 3 inches (1.905 m) on center measured along the centerline of the rail and construct with blockouts.

GUARDRAIL 606 - 1

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

4.1 ERECTING RAIL ELEMENTS

A. Erect standard design (single-faced) guardrail of the type shown on the plans. Erect barrier design (double-faced) guardrail as shown on the plans.

B. Erect rail elements in a manner resulting in a smooth, continuous installation. Use shop-curved rail on curves with radii from 5 to 70 feet (1.5 to 22.4 m).

C. Except where otherwise required, such as expansion joint bolts, draw bolts tight. Tighten bolts through expansion joints as tight as possible without preventing the rail elements from sliding past one another longitudinally. Provide bolts long enough to extend at least 1/4 inch (6 mm) beyond the nuts.

D. Do not use splice bolts that extend more than 1/2 inch (13 mm) beyond the nuts. For double-faced guardrail, provide bolts that extend from 1/4 to 1 inch (6 to 25 mm) beyond the nuts.

E. Fabricate all metal in the shop. Do not perform burning or welding in the field. The Engineer may approve making holes in the field, but only for special details in exceptional cases. The Engineer may approve field punching, cutting, and drilling if the Contractor demonstrates that its methods do not damage the surrounding metal.

F. Repair galvanized surfaces that have been abraded such that the base metal is exposed, including threaded portions of all fittings and fasteners, and cut ends of bolts as specified by

ASTM A 780.

G. Erect guardrail so that the bolts at expansion joints are located at the centers of the slotted holes.

Splice the rail elements by lapping in the direction of traffic. Ensure that the plates at each splice make contact throughout the area of the splice.

1 The basis for this specification was taken from the 2008 Construction and Material Specifications from the Ohio Department of Transportation, Office of Construction Administration, but it has been modified for

END OF ITEM 606

GUARDRAIL 606 - 2

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

ITEM 608 (ODOT) WALKS, CURB RAMPS, AND STEPS1

A. This work consists of constructing walks, curb ramps, and steps.

Aggregate Base.......................................... 304.01 and 304.02 Asphalt concrete Type 1 Concrete, Class C....................................... 499 and 511 Reinforcing steel ......................................... 509.02 Crushed aggregate meeting ..............................grading requirements of 703.10 Expansion joint material ............................. 705.03

3.1 CONCRETE WALKS

A. Construct concrete walks as follows:

1. Excavation. Excavate to the required depth and to a width that allows installation and bracing of forms. Shape and uniformly compact the subgrade to a surface conforming to the plans.

2. Forms. Use either fixed forms or slip-form methods. For fixed-form construction, use wooden or metal forms that extend the full depth of the concrete and that do not spring under the concrete pressure. For slip-form construction, perform the work according to 609.04.C.

3. Placing and Finishing. Immediately before placing concrete, thoroughly moisten the subgrade or base aggregate. Deposit concrete in a single layer, strike it off with a template, and smooth it with a float to obtain a sandy texture. Do not plaster the concrete. Use a 1/4-inch (6 mm) radius edging tool to edge all outside edges and joints.

Divide the surface of the walks into equally spaced rectangular blocks at approximately 5-foot (1.5 m) intervals. Saw or form transverse joints to a depth of not less than one-fourth the thickness of the slab and to a width of approximately 1/8 inch (3 mm). Install 1/2-inch (13 mm) thick expansion joint filler between the walk and any fixed structure that extends the full depth of the walk. Install 1-inch (25 mm) thick expansion joint filler between the walk and the back of curb that is on a 250-foot (75 m) or smaller radius, such as at street intersections.

4. Slope. Construct the surface of the walk with a transverse slope rate of 0.02 and with the low side adjacent to the roadways or parking areas, and away from buildings.

5. Curing. Cure concrete according to Item 451.

4.1 ASPHALT CONCRETE WALKS

A. Construct asphalt concrete walks as follows:

WALKS, CURB RAMPS, AND STEPS 608 - 1

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

1. Excavation and Forms. Excavate and construct forms according to 608.03.A and 608.03.B.

2. B. Base. Place and thoroughly compact aggregate base in layers not exceeding 4 inches (100 mm) in depth.

3. Asphalt Placement and Compaction. Place asphalt concrete in one or more courses to provide the required depth when compacted using a hand roller or power roller of a type and weight acceptable to the Engineer.

5.1 CRUSHED AGGREGATE WALKS - Not Used.

6.1 CONCRETE STEPS

A. Construct concrete steps as follows:

1. Excavation and Forms. Excavate and construct forms according to 608.03.A and 608.03.B.

2. Placement and Finishing. Place and finish concrete according to Item 511, except finish the treads of steps to produce a sandy texture.

3. Slope. Slope step treads at a rate of 0.01 and toward the next lower step.

4. Curing. Cure steps according to 608.03.E.

5. Railing. If specified, install hand railing according to Item 517.

7.1 CURB RAMPS

A. Excavate, form, place, finish, and cure according to 608.03.A, 608.03.B, 608.03.C, and

608.03.E. Finish ramps to a rougher final surface texture than the adjacent walk and with striations transverse to the ramp slope using a coarse broom or other method approved by the Engineer.

1 The basis for this specification was taken from the 2008 Construction and Material Specifications from the Ohio Department of Transportation, Office of Construction Administration, but it has been modified for

END OF ITEM 608

WALKS, CURB RAMPS, AND STEPS 608 - 2

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

ITEM 609 (ODOT) CURBING1

A. This work consists of furnishing and constructing curb, combination curb and gutter, medians, and traffic islands. This work also consists of excavating, backfilling, furnishing and installing joint materials, and disposing of surplus excavation and discarded materials according to Item 203.

Concrete, Class C Preformed filler ........................................... 705.03 Tie bar steel, epoxy coated .................................................................. 709.00, 709.01, 709.03, 709.05 Coated dowel bars ..................................... 709.13

Furnish the best quality of Berea or Amherst gray sandstone, or sandstone of equal quality.

3.1 STONE CURB - Not Used.

4.1 CAST-IN-PLACE CONCRETE CURB AND COMBINATION CURB AND GUTTER

A. Forms and Joints. Use approved steel forms for curbs. Securely brace and hold forms to the line and grade shown on the plans. The Contractor may use approved flexible forms of steel or wood to construct the radius of a circular curb 200 feet (60 m) or less. Immediately before placing concrete, clean the inner surface of the forms, and coat this surface with a form release agent.

Where curb and combination curb and gutter is not constructed integral with, or tied to, the base or pavement, construct 1/4-inch (6 mm) wide contraction joints at 10-foot (3 m) intervals using steel separator plates, a grooving tool, or a saw according to Item 451. For combination curb and gutter, construct the joint to an average depth of 2 inches (50 mm) or more. For curb, construct the joint to an average depth of one-fifth or more of the curb height. Where expansion joints occur in the abutting pavement, separate the section being placed with 1-inch (25 mm)

705.03 preformed filler.

Where the curb is integral with, or tied to, the base or pavement, construct the same type of joints as used in the pavement. Space joints identically with the joints in the base or pavement.

Leave curb forms in place until their removal will not crack, shatter, or otherwise injure the concrete. Do not seal transverse joints in cast-in-place concrete curb and combination curb and gutter.

If curbs are to later serve as a support for a finishing machine in the placing of a surface course, align supporting edges so that the distance between the curbs is within 1/2 inch (13 mm) from that specified.

CURBING 609 - 1

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

B. Placing. Place concrete in forms prepared as described above, and vibrate the concrete to eliminate all voids.

Place concrete for curb that is integral with the concrete base or pavement while the base or pavement concrete is plastic. Where the presence of the finishing equipment on the forms at the end of the day’s run prevents completing the curb, install No. 5 (No. 16M) tie bars vertically in the pavement at 1-foot (0.3 m) intervals and in a line 3 inches (75 mm) inside of and parallel to the pavement edge. Install these tie bars to within 1½ inches (38 mm) of the subgrade or subbase and 2 inches (50 mm) above the concrete base or pavement surface. Water cure this horizontal construction joint between the concrete base or pavement and the curb, or membrane cure the concrete base or pavement and remove the membrane before placing the curb.

Immediately before placing the concrete curb, brush mortar (consisting of one part cement to two parts sand with enough water to form a workable mortar) into the surface area of the hardened concrete pavement or base where the curb is to be placed. Do not allow the mortar to dry before placing the curb on top of it.

C. Slip-Form Placement. The Contractor may use a self-propelled machine to place concrete curb or curb and gutter. Force the concrete through a mold of the proper cross-section to obtain the proper density and cross-section. If using a track, set and secure the track on which the machine operates to the exact line and grade given by the Engineer. Use concrete of a consistency that provides the desired shape and remains as placed without slumping of the vertical faces.

D. Finishing. Without adding extra mortar, float the top of the curb to thoroughly compact the concrete and produce a smooth and even surface. Round the edges of the curb using a tool specially designed for this purpose. Immediately after removing the forms, rub the exposed face of the curb with a float to eliminate unnecessary tool marks. Provide a finished surface free of irregularities and waves, and uniform in texture.

E. Protection. Cure concrete according to Item 451.

5.1 ASPHALT CONCRETE CURB - Not Used.

6.1 CONCRETE MEDIAN AND TRAFFIC ISLAND

A. Forms and Joints. Securely brace and hold approved steel forms to the line and grade shown on the plans. The Contractor may use approved flexible forms of steel or wood to construct a radius of 200 feet (60 m) or less. Immediately before placing concrete, clean the inner surface of the forms, and coat this surface with a form release agent.

Where medians and traffic islands are not anchored to the pavement, construct contraction joints at 10-foot (3 m) intervals using steel separator plates, a grooving tool, or saw according to Item

451. Construct the joint using steel separator plates, a grooving tool, or saw according to Item

451. Construct the joint to a minimum depth of 2 inches (50 mm).

Where, as shown on the plans, the medians or traffic islands are anchored to the pavement, construct the same type of joints in the median or traffic island as used in the pavement. Space the joints identically with the joints in the pavement.

Leave forms in place until their removal will not crack, shatter, or otherwise injure the concrete.

CURBING 609 - 2

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B. Placing. Before placing a concrete median or traffic island on subgrade, sprinkle the subgrade with water until thoroughly moistened at times and in a manner directed by the Engineer.

Place the concrete in forms prepared as described above, and vibrate the concrete to eliminate all voids.

C. Slip-Form Placement. The Contractor may use a self-propelled machine to place medians and traffic islands. Force the concrete through a mold of the proper cross-section to obtain the proper density and cross-section. If using a track, set and secure the track on which the machine operates to the exact line and grade given by the Engineer. Use concrete of a consistency that provides the desired shape and remains as placed without slumping of the faces.

D. Finishing. Without adding extra mortar, finish the top of the median or traffic island to a broom texture. Round the edges using a tool specially designed for this purpose. Immediately after removing the forms, rub the exposed faces with a float to eliminate unnecessary tool marks.

Provide a finished surface free of irregularities and waves, and a uniform texture.

E. Protection. Cure concrete according to Item 451.

1 The basis for this specification was taken from the 2008 Construction and Material Specifications from the Ohio Department of Transportation, Office of Construction Administration, but it has been modified for

END OF ITEM 609

CURBING 609 - 3

Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

ITEM 630 (ODOT) TRAFFIC SIGNS AND SIGN SUPPORTS1

A. This work consists of furnishing and installing traffic signs, sign supports, and foundations complete and ready for service. This work also includes necessary excavation and backfill, disposal of discarded materials, and restoration of disturbed facilities and surfaces to a condition equal to that existing before this work started.

A. The acceptance of materials and products is based on Certified Test Data, furnished in triplicate, or on test results of samples according to 106.02, as required by the Laboratory.

B. Transfer manufacturers’ guarantees or warranties on all traffic sign material to the Government or other maintaining agency upon completion and acceptance of the project.

C. Furnish materials conforming to:

Concrete, Class C ................................ 499, 511 Steel:

Structural steel ................................. 711.01 Reinforcing steel............................... 509.02 U-channel posts ............................... 730.015 Square posts .................................... 730.016 Tube and pipe .................................. 730.01 Anchor bolts and nuts....................... 730.02 Poles and arms ................................ 730.03 Base and arm plates ........................ 730.04 Handhole covers .............................. 730.05 Pole caps.......................................... 730.06 Arm caps .......................................... 730.07 Hardware.......................................... 730.08 Stainless steel .................................. 730.09 Stainless steel hardware .................. 730.10 Messenger wire ................................ 732.18 Aluminum:

Sheet and plate ................................ 730.11 Extrusions......................................... 730.12 Tube and pipe .................................. 730.13 Castings............................................ 730.14 Forgings............................................ 730.15 Welding rods .................................... 730.17 Other materials:

Decals............................................... 725.21 Reflective sheeting, Type F.............. 730.18 Reflective sheeting, Type G ............. 730.19 Reflective sheeting, Type H ............. 730.192 Reflective sheeting, Type J .............. 730.193 Non-reflective sheeting .................... 730.20 Silk screen inks ................................ 730.22 Transparent electronic cuttable films 730.23

TRAFFIC SIGNS AND SIGN SUPPORTS 630 - 1

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

3.1 CERTIFIED DRAWINGS

A. Furnish certified drawings according to 625.06.

4.1 SIGN FABRICATION

A. Sign types include flat sheet, only. Flat sheet signs consist of one-piece units made of aluminum.

B. Prior to reflective sheeting application, clean aluminum sign surfaces either by total immersion in a tank containing an alkaline solution of the manufacturer’s specification or by steam cleaning with an alkaline solution of the manufacturer’s specification, followed by a thorough rinsing with running water. After cleaning, etch the surface with an acid solution, and dry. Do not allow cleaned and etched surfaces to become contaminated by contact with oil or grease. Drill or punch bolt holes to finish size.

C. Use sign legends according to the OMUTCD and the Sign Design Manual. Use Clearview font for positive contrast legends on freeway and expressway guide signs and on all other guide signs when permitted in the Sign Design Manual. Use capital legends and upper/lower case legends in accordance with the Sign Design Manual. When either is permitted in the Sign Design Manual, use upper/lower case legends.

D. For flat sheet signs, use Type G, H or J reflective sheeting for background and reflective legends. Apply reflective sheeting to the surface according to the manufacturer’s recommendations, with no blisters, wrinkles, tears, or blemishes. Do not use reboundable or damage control sheeting for permanent signs.

E. For reflective legends on flat sheet signs, use reverse silk screen transparent ink, electronic cuttable film, or direct applied reflective sheeting copy. When using direct applied reflective sheeting copy, apply all legend on a sign with the same rotation angle orientation. For non-reflective legends, use direct silk screen black ink or direct applied non-reflective black sheeting copy.

F. Use fluorescent yellow green reflective sheeting for the following signs: SCHOOL (S4-3), School

Crossing (S1-1), yellow portions of school speed limit (S5-H3, S5-H4, S5-H5), SCHOOL

ENTRANCE (S3-H3), SCHOOL BUS STOP AHEAD (S3-1), SCHOOL BUS TURN AHEAD (S3-

H2), Bicycle Crossing (W11-1), Pedestrian Crossing (W11-2), Handicap Crossing (W11-9), SAFETY ZONE (W11-H15), and Playground (W15-1). Fabricate supplemental signs [such as SHARE THE ROAD (W16-1), Advisory Speed Plate (W13-1), Distance Plates (W16-2, W16-2a, W16-3, W16-3a), Supplemental Arrows (W16-5p, W16-6p, W16-7p, and AHEAD Plate (W16- 9p)] from fluorescent yellow green sheeting when used with a sign above.

G. Use fluorescent yellow reflective sheeting for all yellow signs, yellow portions of multi-colored signs, and yellow sign post reflectors, except for signs and portions of signs required to be fabricated with fluorescent yellow green reflective sheeting.

5.1 FOUNDATIONS

A. Locate sign support foundations so the plane of the sign surface is at a right angle to the roadway lanes served (except for signs not intended for this orientation). Install foundations in accordance with 632.14. Furnish and install a ground rod at each rigid overhead and span wire sign support foundation, in accordance with 625.16.

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Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

B. Before placing foundation concrete for embedded supports, brace the supports in a vertical position. 7 days after concrete placement, remove bracing for embedded supports and erect signs.

6.1 SIGN SUPPORTS

A. Sign supports consist of ground mounted, fabricate sign supports according to the applicable requirements of Item 513.

B. Tighten threaded fasteners, except anchor bolt nuts, by the “turn of the nut” method according to

513.20.

C. Furnish anchor bolts with a leveling nut, plain washer, and anchor nut conforming to 730.02.

Use anchor nuts with a plain washer against the base plate upper surface.

D. Tighten anchor bolt nuts according to 513.20, except that under Table 513.20-3, use the “nut rotation from snug tight condition” from 1/12 to 1/6 turn instead of 1/3 turn.

E. Apply anaerobic adhesive complying with Federal Standard MIL S 46163, Type II, Grade N to anchor bolts and other threaded connections ½-inch diameter or larger, according to the manufacturer’s recommendations. Do not use anaerobic adhesive with torque-limiting nuts.

F. Submit alternate designs or materials for sign supports for acceptance at least 21 days in advance of a bid opening date. The Director will give notification of the acceptance or rejection of the alternate design to the bidder at least 7 days in advance of a bid opening date.

1. Ground Mounted Supports. Ground mounted supports consist of structural sections of the material and weights required. Drive the ground mounted supports into the earth or embed them in concrete, as specified. Install supports in exposed locations in accordance with the performance requirements of NCHRP 350.The support lengths shown on the plans are approximate. Determine the exact length of supports before fabrication.

a) Post Supports. Mark each driven post with a line of paint 6 inches above the specified driving depth. Drive posts to the specified depth without bending, distortion, or end mutilation. Do not splice posts. Do not place posts in drainage ditches. If unable to install the post at the specified location, relocate the post with the Engineer’s approval.

Install posts located in paved areas through a hole provided by sleeving or core drilling. After the post is in position, patch the hole with asphalt concrete or an approved asphalt material.

For groupings of flat sheet signs in multiple arrangements mounted on posts, provide sign backing assemblies.

For one-way and street name sign supports, use square posts for mounting signs at right angles to other signs on the post.

For temporary sign supports and their placement, conform to the OMUTCD.

7.1 SIGN ERECTION

A. Erect signs on ground mounted or overhead supports according to the schematic signing layout.

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http://www.dot.state.oh.us/Divisions/ConstructionMgt/Specifications/2008CMS/500/513.htm

Defense Supply Center Columbus (DSCC) – Columbus, Ohio Issued for Construction

1. Flat Sheet Sign Erection. Use steel bolts, wide washers, lock washers and nuts. Use bearing plates between the sign and U-channel post at each bolt. Field drill signs mounted on messenger wire or mast arms to match holes in brackets.

8.1 SIGN SHIPMENT AND STORAGE

A. Package and ship finished flat sheet signs to assure adequate protection of the sign face, using methods and materials as recommended by the reflective sheeting manufacturer.

B. Store signs off the ground in a vertical position with adequate covering or shelter to prevent packing material from getting wet. Immediately remove packing material that does become wet from contact with sign faces to prevent damage to the reflective sheeting.

9.1 INSPECTION

A. After erection, the Contractor will inspect signs under both day and night conditions. Correct deficiencies in lateral position or visibility to the Government’s satisfaction.

1 The basis for this specification was taken from the 2008 Construction and Material Specifications from the Ohio Department of Transportation, Office of Construction Administration, but it may have been modified for project specific issues. Therefore, this specification section shall govern.

END OF ITEM 630

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