Chase_Rd_Bridge_Rehab_Part_H_-_Technical_Provisions_S&S.pdf

PART H - TECHNICAL PROVISIONS

For the Construction of

ORC-020-50

Bridge No. 754074 - Chase Road Bridge Over Lake Butler/Lake Louise

Maintenance and Rehabilitation

For

Orange County Engineering

January 2022

Avcon, Inc.

5555 East Michigan Street, Suite 200 Orlando, Florida 32822

Dominick Fiorentino III, P.E.

P.E. No. 87365

Part H – Technical Provisions

INDEX OF PART H – TECHNICAL PROVISIONS

TP SECTION

TP 101 Mobilization TP 102 Maintenance of Traffic TP 104 Prevention, Control and Abatement of Erosion and Water Pollution TP 110 Clearing and Grubbing TP 120 Embankment TP 400 Concrete Structures TP 401 Restored Spalled Areas, Portland Cement Group TP 411 Epoxy Crack Injection TP 451 Wall Soil Anchors, Helical TP 455 Sheet Piling TP 457 Standard Integral Pile Jackets, Structural TP 524 Concrete Slope Pavement, Reinforced TP 530 Riprap (Rubble) – Ditch Lining TP 531 Concrete Revetment Repair – Fabric Formed TP 901 Concrete Slab Stabilization and Soil Densification with High-Density Polyurethane Foam

TP-101 1

Bridge No. 754074 - Chase Rd Bridge

TP 101

MOBILIZATION

Mobilization shall include all items detailed in Section 101-1 of the “Standard Specifications”, the Special Provisions and on the plans, except as directed by the Engineer.

Basis of Payment

The work and incidental costs covered under Mobilization will be paid for at the contract lump sum price and will be paid in partial payments in accordance with the following:

Percent of Original Contract Allowable Percent of the Lump Sum Amount Earned Price for the Items*

5 25 10 50 25 75 50 100

*Partial payments as detailed above will be limited to 10% of the original Contract amount for the roadway pay items. Any amount of mobilization in excess of 10% of the roadway pay items will be paid upon completion of all work.

Payment shall be made under:

Pay Item:

101-1 Mobilization - Lump Sum

TP-102 1

Maintenance and Rehabilitation

TP 102

MAINTENANCE OF TRAFFIC

All Maintenance of Traffic work shall conform to the requirements of Section 102 of the “Standard Specifications”, Index 102 of the FDOT Standard Plans, the plans, and/or as herein modified, except as directed by the Engineer.

The road shall be kept open to two-way traffic on a paved surface during construction except when full closures are allowed by the plans or by the Engineer. The Contractor shall not be permitted to isolate residences or places of business. Access shall be provided to all residences and all places of business whenever construction interferes with the existing means of access.

The Contractor shall furnish, erect and maintain all necessary traffic control devices, including flagmen and pilot cars, in accordance with the Manual of Uniform Traffic Control Devices for Streets and Highways, published by the U.S. Department of Transportation, Federal Highway Administration. The Contractor shall provide and maintain in a safe condition the entire project limits included, but not limited to pre-existing conditions, driving lanes, temporary approaches, crossings, and intersections with trails, roads, streets, business parking lots, residences, garages and completed work. The Contractor shall take all necessary precautions for the protection of the work and the safety of the public in accordance with Section 102.

The Contractor shall present his signed and sealed Maintenance of Traffic Plan that is approved by Orange County Traffic Engineering to the Engineer at the preconstruction conference, and shall be fully and solely responsible for the adequacy of the Maintenance of Traffic plan regardless of the source. The plan shall be signed and sealed by the Contractor’s own professional engineer licensed in the State of Florida. Any proposed revisions to the approved Maintenance of Traffic plan are required to be approved by the Engineer.

The Contractor shall be responsible for installation of signs for all business along the project corridor. Signs should be manufactured and installed in accordance with FDOT Standard Plans.

No special compensation will be made to the contractor to defray costs of any of the work or delays for complying with the requirements of installing business signs, but such costs shall be considered as having been included in the price stipulated for the Maintenance of Traffic pay item.

Lane closures are only allowed during weekdays from 9:00 AM to 2:00 PM.

Basis of Payment

All materials, work and incidental costs related to Maintenance of Traffic will be paid for at the contract lump sum price. All material, labor and equipment necessary for the construction and maintenance of the entire project limits included, but not limited to pre-existing conditions, driving lanes, temporary approaches, crossings, intersections with trails, roads, streets, business parking lots, residences, garages, temporary driving lanes, side streets, driveway connections, and completed work, as may be directed by the Engineer shall be included in the contract price.

Payment will be made under:

Item No. 102-1 Maintenance of Traffic - Lump Sum

TP-104 1

Maintenance and Rehabilitation

TP 104

PREVENTION, CONTROL AND ABATEMENT OF EROSION AND WATER

POLLUTION

LAND CLEARING

Prevention, control and abatement of erosion and water pollution shall conform to the requirements of Section 104 of the “Standard Specifications”, National Pollution Discharge Elimination System (NPDES) requirements, except as modified by these Technical Provisions or as directed by the Engineer.

The Contractor shall present at the Preconstruction Conference its Storm Water Pollution Prevention Plan (SWPPP) and a separate schedule to manage erosion and water pollution. This schedule shall include a complete outline of the proposed construction of all erosion and pollution control and abatement items required.

The Contractor shall be responsible for the preparation and submittal of the Notice of Intent (NOI) and Notice of Termination (NOT) to the Florida Department of Environmental Protection (FDEP) and shall obtain the FDEP Generic Permit for Stormwater Discharge from Large and Small Construction Activities.

Permitting

If exceedances are found in the dewatering effluent, the CONTRACTOR will be required to:

1. Immediately notify the COUNTY and report the exceedances that are encountered.

2. Meet with the FDEP to determine alternatives that are acceptable.

3. Obtain prior COUNTY approval of treatment and disposal alternatives.

4. Obtain prior written COUNTY authorization to use pay item TP 104-14

5. Apply and obtain permits and/or treatment approvals that FDEP requires including, but not limited to:

a. Generic Permit for Discharges from Petroleum Contaminated Sites (62-

621.300(1), F.A.C.). Allows discharges from sites with automotive gasoline, or diesel fuel contamination.

b. Permit for all Other Contaminated Sites (62-04; 62-302; 62-620 & 62-660, F.A.C.).

The coverage is available only through the individual NPDES permit issued by FDEP. Allows discharges from sites with general contaminant issues, i.e. ground water and/or soil contamination other than petroleum fuel contamination.

c. Generic Permit for the Discharge of Produced Ground Water from Any Non- Contaminated Site Activity (62-621.300(2), F.A.C.).

d. Generic Permit for Stormwater Discharge from Large or Small Construction

Activities (62-621.300(4) (a), F.A.C.).

TP-104 2

Maintenance and Rehabilitation

6. Apply and obtain permits and/or treatment approvals that the Water Management District requires including, but not limited to:

a. No-Notice Short-Term Dewatering Permit (40E-20.302(3), F.A.C.) If the Contractor’s proposed work is expected to exceed 90 days in duration, or does not meet any of the other requirements listed with the requirements of Rule 40E- 20.302(3), the Contractor must apply for and obtain a Dewatering General Water Use Permit (40E-20.302(2) F.A.C.)

The Contractor shall not be entitled to file, or recover under, any delay claim based on preparation of permit applications and the time required for obtaining the applicable permits. If, prior to or during the dewatering, it is determined that the disposal or discharge of the dewatering effluent is not authorized by the FDEP’s Generic Permit for the Discharge of Produced Ground Water from Any Non-Contaminated Site Activity, the Contractor shall diligently pursue further required permit(s) from FDEP or other agencies without resort to delay claims or recompense from the County for either permit application activities or the time required to obtain such permits.

The Contractor shall consider and anticipate the potential need to obtain the herein discussed permits in developing his schedule and shall make every effort to avoid or minimize potential impacts to his critical path that might result from delays in dewatering activities due to the time necessary for the Contractor to obtain the necessary permits. The Contractor shall make every effort to schedule activities requiring dewatering as late as possible during his schedule and shall schedule activities not impacted by dewatering as early as possible. For each day, up to a maximum of one hundred eighty (180) days that the Contractor diligently pursues such permit(s) and is unable to avoid adversely impacting his critical path, a day will be added to the time allotted to the Contractor to complete performance of the Project.

Basis of Payment

All work and incidental costs required to comply with the articles of this specification will be paid at the contract lump sum price for Prevention, Control and Abatement of Erosion and Water Pollution.

Payment will be made under:

Item No. 104-11 Prevention, Control and Abatement of Erosion and Water Pollution – Lump Sum

TP-110 1

Maintenance and Rehabilitation

TP 110

CLEARING AND GRUBBING

All clearing and grubbing shall be performed in accordance with the requirements of Section 110 of the "Standard Specifications", except as directed by the Engineer.

Work under Clearing and Grubbing shall include vegetation removal and the selective demolition of all existing elements within the limits of work (if abandoned) unless otherwise shown on the plans or directed by the Engineer. Scope of work shall include but is not limited to, the removal of vegetation, rigid concrete side slope pavement (fabric formed concrete), and parts of the existing rigid concrete bulkhead. Do not damage or cut existing reinforcing bars within the concrete bulkhead to be removed.

All material and debris resulting from clearing and grubbing operations shall be disposed of by the Contractor at locations and by methods accepted by Engineer. The removal and proper disposal of these materials shall be included in the lump sum quantity for clearing and grubbing.

Basis of Payment

All work and incidental costs required to perform clearing and grubbing as herein specified will be paid for at the contract lump sum price.

Payment shall be made under:

Item No. 110-1-1 Clearing and Grubbing - Lump Sum Item No. 110-4-2 Removal of Existing Concrete (Side Slopes) – Per Square Yards Item No. 110-73 Removal of Existing Bulkhead – Per Linear Feet

TP-120 1

Maintenance and Rehabilitation

TP 120

EMBANKMENT

All embankment work shall conform to the requirements of Section 120 of the "Standard Specifications" and the provisions of this section, except as directed by the Engineer.

Basis of Payment

Embankment will be paid for at the cubic yard price.

Payment shall constitute full compensation for all work described herein and in the Special Provisions and shall include grading of shoulders, graded road connections, slopes, compaction, final dressing, and all work required for completing the project that is not paid for under the other pay items. Also, included is removal and off-site disposal or on-site utilization of all materials, structures, abandoned utilities and obstructions as directed by the Engineer.

Payment shall be made under:

Item No. 120-6 Embankment – Per Cubic Yards

TP-400 1

Maintenance and Rehabilitation

TP 400

CONCRETE STRUCTURES

The work specified in this Section consists of the construction of concrete bulkhead and miscellaneous concrete to construct the retaining walls conforming to Concrete Class IV in Sections 346, 400, 415, and 416 of the “Standard Specifications”. Scope of work includes protecting from damage the existing reinforcing bars, and preparing for reuse, portions of the existing bulkhead, protection of existing precast retaining wall panels from damage, constructing tie-ins of existing reinforcing bars with proposed reinforcing bars, filling voids between existing retaining panels and steel sheet piles, and furnishing and installing filter fabric at all interfaces between the existing and new walls.

Basis of Payment

The quantity to be paid for under this Section shall be the volume, in cubic yards, of the classes of concrete shown in the plans, completed, in place, and accepted, except as noted herein. The price and payment shall constitute full compensation for all work described herein, including all labor, equipment and materials necessary to complete the work as shown on the plans.

Item No. 400-4-8 Class IV Concrete - per Cubic Yard

TP-401 1

TP 401

RESTORED SPALLED AREAS, PORTLAND CEMENT GROUP

The work specified in this Section consists of replacing deteriorated concrete and concrete restoration to the surface of existing concrete elements in the bridge superstructure and substructure including retaining walls. The preparation of the concrete substrate to sound concrete and application of repair materials shall be in conformance with Section 930 of the “Standard Specifications”. Refer to the plans for location and size of repair.

Method of Measurement

The quantity to be paid for will be the volume in cubic feet of concrete repair material authorized, complete, in place and accepted. The method utilized in determining the volume shall be calculated by the Contractor for written concurrence by the Engineer and will be the surface area in square feet multiplied by the average depth of such areas. The Contractor is responsible for recording dimensions of the repairs with photographic evidence in the case where an inspector has not performed a visual inspection prior to placement of repair concrete.

Basis of Payment

The price and payment shall be full compensation for all work specified in this Technical Special Provision including all removals, surface preparations, bonding agents, concrete placement, dewatering, forming, materials, equipment, tools, scaffolds, labor and other materials necessary to complete the work in accordance with the Contract Documents.

Item No. 401-70-4 Restored Spall Areas, Portland Cement Grout - per Cubic Feet

TP-411 1

TP 411

EPOXY CRACK INJECTION

The work specified in this Section consists of concrete restoration USING Type E compound epoxy injected into cracks in concrete substructure elements in conformance with Section 411 and 412 of the “Standard Specifications”. Refer to the plans for location and size of repair.

Basis of Payment

The quantity to be paid for under this Section shall be the volume, in gallons, by the actual volume of concrete repair for each repair in the field. The Contractor is responsible for recording quantity used with photographic evidence of dispensed cartridges. The price and payment shall constitute full compensation for all work described herein, including all labor, equipment, and materials necessary to complete the work as shown on the plans.

Payment shall be made under:

Item No. 411-1 Epoxy Material for Crack Injection – per Gallon Item No. 411-2 Cracks, Inject, and Seal – per Linear Feet

TP-451 1

TP 451

WALL SOIL ANCHORS, HELICAL

The work specified in this Section consists of furnishing and installing soil helical anchors embedded in the soil and in the concrete bulkhead in conformance with the load and spacing general requirement in the plans and the proprietary helical soil anchor approved shop drawings and calculations. The design of the helical anchors, consisting of signed and sealed shop drawings and calculations, shall be delegated to a Florida licensed Professional Engineer experienced in the design of helical soil anchors and submitted for Engineer review. A test anchor for each of the four wingwall locations, in general conformance with ASTM D-1143, shall be furnished prior to production fabrication of the remaining anchors. The delegated Engineer shall review the documentation of the field test and provide a signed and sealed letter to the Engineer stating conformance with the project load requirements and soils parameters found in the project Geotechnical Report .

Product Material shall the minimum mechanical properties:

Solid Square Bar (ASTM A29) – 90,000 psi yield strength Tubular Shaft (ASTM A53) – 35,000 psi yield Fabricated Steel Components (ASTM A572 Grade 50) – 50,000 psi yield strength Forged Steel Components (ASTM A572 Grade 80) - 80,000 psi yield strength

Basis of Payment

The quantity to be paid for under this Section shall be per each anchor. The price and payment shall constitute full compensation for all work described herein, including all labor, equipment and materials necessary to complete the work as shown on the plans as well as the delegated Engineering services required to select the working helical anchor type, size, and length.

Item No. 451-70 Wall Soil Anchors, Helical – per Each

TP-455 1

Maintenance and Rehabilitation

TP 455

SHEET PILING

Permanent Steel Sheet Piling shall conform to the requirements of Sections 455, 560, and 962 of the “Standard Specifications” and Steel Sheet Piling Notes located in the Contract Plans.

Temporary Steel Sheet Piling used in cofferdams and to incorporate the Contractor’s specific means and methods, and not ordered by the Engineer, is not included in this specification. Should the Contractor require temporary sheet piling, the Contractor shall secure the services of a delegated Engineer licensed in the state of Florida and provide signed and sealed shop drawings (plans, elevations, and sections) and calculations for Engineer records.

Basis of Payment

Quantities measured for payment under this Section shall be square feet in the planar elevation of the wall, measured from top of pile elevation to the bottom of pile elevation and longitudinally along the top of the sheet piles as shown in the plans. Payment will be full compensation for all labor, equipment, and materials required for furnishing and installing steel sheet piling including specified openings and furnishing and installing coal tar-epoxy. Costs will also include all labor, equipment, and materials for incidental items onto the steel piling associated with the construction of the concrete bulkhead. Temporary Sheet piling used in cofferdams and to incorporate the Contractor’s specific means and methods, and not ordered by the Engineer, will be paid for as required in Section 125.

Item No. 455-133-3 Sheet Piling Steel, Permanent – Per Square Foot

TP-457 1

Maintenance and Rehabilitation

TP 457

STANDARD INTEGRAL PILE JACKETS, STRUCTURAL

The work specified in this Section consists of the construction of an integral pile jacket to the dimensions shown on the plans. Pile Jackets shall be structural jackets and conform to Section 346 and 415 and the quality control requirements in Section 105 of the “Standard Specifications” and “Special Provisions to the Standard Specifications” SP4570000 except as amended herein.

Materials

Fillers are to be Portland cement concrete, Class IV Concrete meeting the requirements of Section 346 with an adjusted slump of 7 inches to 9 inches. Reduced size coarse aggregate may be used as approved by the Engineer.

Basis of Payment

The quantities to be paid for under this Section will be the total feet of integral pile jacket furnished, installed, completed, and accepted. Measure length from bottom of the form to top of the form., constructed in accordance with the plans, completed, in place, and accepted, and shall include all items of work described herein and in Sections 105, 346, 415 and SP4570000.

The price shall include all labor and materials, forms, bracing, reinforcing steel, concrete, and all items and incidentals necessary to complete this item of work.

Item No. 457- 1-21 Standard Integral Pile Jacket, Structural - per foot.

TP-524 1

Maintenance and Rehabilitation

TP 524

CONCRETE SLOPE PAVEMENT, REINFORCED

Construction of concrete slope pavement (Class NS Concrete) shall conform to the requirements of Section 524 of the "Standard Specifications." No crack control joints are required. Provide filling of shrinkage hairline cracks with penetrating sealer per manufacturers requirements, if applicable.

Where specified in the plans, provide low-modulus sealant meeting the requirements of Section 932 of the “Standard Specifications”.

Basis of Payment

The quantities to be paid for Concrete Slope Pavement will be in square yards, completed and accepted, based on the sloped dimensions. Payments shall constitute full compensation for furnishing all materials and completing all work described herein or shown on the plans, including all disposal of surplus material; hand compaction, furnishing and placing of all concrete;

reinforcing steel and any other necessary fittings as shown in the plans, required for acceptable construction, or as directed by the Engineer.

Item No. 524-2-29 Concrete Slope Pavement, Reinforced - Per Square Yard.

TP-530 1

Maintenance and Rehabilitation

TP 530

RIPRAP (RUBBLE) – DITCH LINING

Construct riprap composed of broken stone and broken concrete protection rubble (consisting of ditch lining) as shown in the plans shall conform to the requirements of Section 530 of the “Standard Specifications,” except as amended herein and on the plans or as directed by the Engineer. Place geotextile fabric under the rubble riprap within the entire limit of riprap.

Basis of Payment

The quantities to be paid for will be the weight, in tons, in surface dry natural state, by railroad scales, truck scales, or barge displacement. Price and payment will be full compensation for all work specified in this Section, including all materials, hauling, excavation, and backfill. Include the cost of dressing and shaping the existing fills (or subgrade) for placing riprap in the Contract unit price for Riprap (Rubble).

Include the cost of dressing and shaping the existing fills (or subgrade) for placing bedding stone in the Contract unit price for Riprap (Rubble).

Item No. 530-3-4 Riprap (Rubble) (Ditch Lining) - Per Ton

TP-531 1

TP 531

CONCRETE REVETMENT REPAIR – FABRIC FORMED

This work consists of repairing the existing fabric formed concrete revetment system as shown on the plans. The revetment is being used adjacent to the bridge substructure units to protect the substructure from excessive scour.

The existing fabric formed revetment consists of specially woven, double-layer synthetic forms filled with a pumpable, fine aggregate concrete grout in such a way as to form a stable revetment of required thickness, weight, and configuration.

The configuration of the existing fabric formed revetment on this project is the ‘Filter Point Mat’ with 8 inch spacing and an average thickness of 4.0 inches.

Repairs include filling of cracked/separated concrete mats with rapid hardening concrete. The preparation of the concrete substrate to sound concrete and application of repair materials shall be in conformance with Section 930 of the “Standard Specifications” for predominately horizontal surfaces. Dowels for joining separated units and rebar anchors per the plans shall be in conformance with Section 931 of the “Standard Specifications”.

Repair thickness shall match existing in the field. Concrete shall be placed at the top of the final proposed slope adjacent to the installed sheet pile wall to fill the gaps between the wall and existing revetment system concrete mat.

Dowel bars will be required along the water’s edge per the plans to connect any separated existing concrete fabric formed units before repairing with concrete grout mix. The dowel bars shall be post installed with an approved adhesive bonding compound Type HV or HSHV in conformance with Section 937 of the “Standard Specifications”.

Construction

Additional fill material may be required along the outside face of the newly installed steel sheet pile wall to provide a compacted surface for the joining of the existing fabric form concrete revetment system to the front face of sheet pile wall. Fill shall be in conformance and paid for under technical specification 120-6 Embankment.

Method Of Measurement

The quantity to be paid for under this Section will be the volume of concrete, in cubic feet, completed and accepted. Measurements will include the entire volume of cracks sealed and concrete placed along the slope.

Basis of Payment

Price and payment will be full compensation for all work, labor, equipment, and materials specified in this Section, including concrete, grout, dowel bars and anchors.

Item No. 531-1 Concrete Revetment repair – Fabric Formed - Per Cubic Foot

TP-901 1

Maintenance and Rehabilitation

TP 901

STABILIZATION AND SOIL DENSIFICATION WITH HIGH-DENSITY

POLYURETHANE FOAM

This work shall consist of soil densification to strengthen base and sub-base soils under concrete bridge approaches with sleeper slabs by furnishing and injecting expansive polyurethane material into the foundation soils beneath the slabs through holes or injection tubes inserted into drilled holes at locations and depths, as shown on the plans, while monitoring for movement at the surface.

Material

High Density Polyurethane Foam:

Certify that the material conforms to the following requirements listed in this section:

PROPERTY TEST RESULTS

Density, lbs./cu. ft. ASTM D1622 3.5 - 4.5 Compressive Strength, psi (min.) ASTM D1621 55 Tensile Strength, psi (min.) ASTM D1623 90 Shear Strength, psi (min.) ASTM C273 45 Flexural Strength, psi (min.) ASTM D790 90 Closed Cell content (%) ASTM D6226 +85

HDPF shall reach 90% compressive strength within 30 minutes of injection. The material used shall be a two-part 1:1 by volume HDPF. The material shall be water blown, not chemically blown. The material shall be a polyurethane-forming mixture, having water insoluble diluents, which permits the formation of polyurethanes in the presence of water. Water insoluble diluents shall provide polyurethane foam with improved dimensional stability properties. The presence of water insoluble diluents and the characteristics and properties listed above must be certified by the manufacturer and a signed certification with the bid documents.

Aquatic and Terrestrial Toxicity Testing:

Polyurethane must pass aquatic and terrestrial toxicity testing and chemical analysis (RCRA metals, TOC, and COD). The polyurethane must show a lack of toxicity at 200 ppm TCLP leachate and show non-toxic for all test species. Testing must have been performed by an independent third-party testing laboratory. The certification from the independent third-party testing laboratory must be submitted with the bid documents.

Panel Test for Hydro-Insensitivity of High-Density Polyurethane Grout:

Polyurethane must pass the Panel Test for Hydro-Insensitivity of High-Density Polyurethane Grout (see the attached testing protocol). The Panel Test must be performed by an independent third-party testing laboratory, under the supervision and review of a licensed Professional Engineer, and must certify that the polyurethane material meets or exceeds the limits set forth in the panel test specification. The certification from the independent third-party testing laboratory must be submitted with the bid documents.

TP-901 2

ASTM D1621 and ASTM D1622 Requirements:

Prior to beginning work and with the inspector observing, the Contractor must prepare 5 machine mixed field samples for density and compressive strength determination. The samples shall then be transported to an independent third-party testing laboratory at the Contractor’s expense. At the laboratory, a nominal 2” by 2” by 2” sample shall be taken from the center of each of the field samples and the density of the material shall be determined in accordance with ASTM D1622. The compressive strength shall then be determined by testing in accordance with

ASTM D1621.

The Contractor shall submit electronic copies to the Engineer for review of the stress strain curves (ASTM D1621 showing force, lbs. vs. deflection, %) as well as density calculations, including measured specimen dimensions (ASTM D1622) for each specimen tested. Field samples shall be prepared and sent for testing for each individual batch/lot number of resin component used on the project.

The compressive strength and density determined from ASTM D1621 and ASTM D1622 shall be used to determine the percent of pay for this item as outlined in Measurement and Payment.

Non-shrink grout to patch drill holes:

Non-shrink grout must be supplied by a manufacturer on the approved products list and must be used within the shelf life and temperature limitation set by the manufacturer.

Equipment

Provide at a minimum, the following equipment:

Truck-Mounted Pumping Unit:

Provide a truck-mounted pumping unit capable of injecting the high-density polyurethane material beneath the slab. The pumping unit will be capable of controlling the rate of flow of material as required to densify soils. The unit will be equipped with a manufacturer’s certified flow meter to measure the amount of high-density polyurethane injected at each location and will have a digital output in both pounds and gallons.

Pressure and Temperature Control Devices:

Provide pressure and temperature control devices capable of maintaining proper temperature and proportionate mixing of the polyurethane component materials.

Drills:

Provide pneumatic or electric drills capable of efficiently drilling 5/8” to 3/4” diameter injection holes through the slab without damaging the structural integrity of the existing slab.

TP-901 3

Laser Levels or Dial Indicator Devices:

Provide laser levels or dial indicator devices capable of monitoring movement of the slab to verify soil densification.

Cone Penetrometer:

Provide a portable dynamic cone penetrometer for on-site soils investigation to assist in the location of weak sub-base soils and to determine the injection pattern through tubes to densify the weak soils.

Miscellaneous:

Provide all necessary light towers, electric generators, compressors, heaters, hoses, containers, valves, and gauges to efficiently conduct and control the work.

Construction

Preparation:

Provide a slab profile from laser level measurements of each area to be raised to determine the extent of the slab that requires adjustment. Ensure that the finished concrete slabs will conform to the grades and cross-sections of the slabs as shown in the plans or as directed.

Determine the exact locations of the injection holes at 3 to 6 feet intervals for each treated area. Obtain approval for the final proposed grades and injection hole locations before beginning work.

Drilling and Injection:

Inject polyurethane material through a series of 5/8” drilled holes until all known or encountered voids under the slab are filled. The rate and amount of material injection will be determined by the Contractor.

For soil densification and compaction of unconsolidated base soils, a series of 5/8” – 3/4” holes (as required for tube placement) will be drilled at approximately 3-4 foot spaced intervals through the slab above the area requiring soil remediation. Inject the polyurethane material through injection tubes inserted into the drilled holes to the proper depth or depths as determined by the on-site testing. The exact location, spacing, hole size and depth will be selected by the Contractor and approved by the Engineer. The rate and amount of material injected will be determined by the Contractor to obtain proper densification of the base and sub-base soils.

Slab pavement and sleeper support slabs will have all drill holes fully sleeved by tubes into the sub-base soils to prevent any injection of material between the slabs.

Seal injection holes with an approved material and method after injection is completed.

TP-901 4

Grade Control:

Control the final elevations within 1/8 in. of the proposed profile elevations using continuous laser level or dial indicator micrometer readings monitored by the Contractor during injection to determine sufficient material usage and soils densification. Confirm that the slab has been aligned properly to facilitate drainage.

Repairs:

Repair any slab blowouts, excessive slab lifting or slab damage that may occur as a result of the Contractor’s work as directed without any additional compensation.

Set-Time:

Formulate the high-density polyurethane to set and obtain 90% of its compressive strength within 30 minutes after injection. Attain manufacturer’s recommended compressive strength unless otherwise shown on the plans.

Basis of Payment

This Item will be measured by the cubic yard of high-density polyurethane material injected and accepted. The work performed and materials furnished in accordance with this item and measured will be paid for furnishing and injecting material, all labor, materials, tools, and incidentals.

Payment will be made under:

Item No. 901-1 Stabilization and Soil Densification with High-Density Polyurethane

Foam – per Cubic Yard