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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Sections 200 - 599 STANDARD SPECIFICATIONS (USC) January 1, 202 4 Volume 2 B. Method 2 - Integral Placement (Optional). Measure slab reconstruction concrete as the number of square feet of Class E slab reconstruction concrete placed. Measure overlay concrete as the number of square feet of plan area of Class E overlay concrete placed.
578-5 BASIS OF PAYMENT. Include the cost of all labor, materials and equipment necessary to
complete the work in the unit bid price. Payment will be made under: Item No. Item Pay Unit 578.1201nn Overlay Concrete, Class E – Type 1 Friction Square Foot 578.1202nn Overlay Concrete, Class E – Type 2 Friction Square Foot 578.1203nn Overlay Concrete, Class E – Type 3 Friction Square Foot 578.1209nn Overlay Concrete, Class E – Type 9 Friction Square Foot 578.1300nn Slab Reconstruction Concrete, Class D or E Square Foot NOTE : nn denotes a serialized pay item. SECTION 579 - STRUCTURAL SLAB RECONSTRUCTION PREPARATION
579-1 DESCRIPTION. The work shall consist of initially preparing an existing structural slab for
reconstruction. Generally, this work shall entail the removal of concrete to the depths, and at the locations, required by the contract documents.
579-1.01 Structural Slab Scarification
A.This work shall consist of removing the top surface of structural slab concrete. Removal shall be done by scarification to the following limits, unless a greater depth is indicated on the plans:
1.Minimum of 1/4 inch
2.Maximum of 1/2 inch
B.After scarification, if a structural slab survey is required, the surface to be surveyed shall be cleaned sufficiently to allow the survey to be taken. The Engineer will determine if the surface is cleaned sufficiently to allow performance of the neces sary delamination and potential survey tests.
C.All removed materials shall be transported from the work site and disposed of or disposed of in an area on the job site approved by the Engineer.
579-1.02 Exposure of Reinforcing Bars
A.Definitions
1.Bar Mat. That combination of transverse and longitudinal reinforcing steel placed with the structural slab to absorb stresses. Structural slabs generally contain two bar mats; an upper mat and a lower mat.
2.Upper Mat. That bar mat closest to the existing top surface of the structural slab. Only the upper mat is relevant to this work, except in localized areas.
3.Localized Area. An area where full depth removal and subsequent patching will be done as part of this work. For the work of this section a localized area shall not exceed 25 sf . The sum of
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Sections 200 - 599 STANDARD SPECIFICATIONS (USC) January 1, 202 4 Volume 2 the localized areas shall comprise no more than five percent (5%) of the structural slab area to be prepared.
B.The work shall consist of structural concrete removal from the periphery of the upper mat reinforcing bars to provide a minimum clearance of 1 inch between the reinforcing bar surface and the remaining concrete surface. In addition, the Engineer may order the removal of other concrete. (Refer to 579 -3, Construction Details).
C.All work performed under the requirements of this subsection shall not extend beyond a plane which is 5 inches below the original top of slab, except for localized areas.
D.Removed materials shall be disposed of in accordance with 579 -1.01B.
579-2 Materials
Class A Concrete1 5012 Quilted Covers (for curing concrete) 711-02 Plastic -Coated Fiber Blankets (for curing) 711-03 NOTES:
1.501, Class D Concrete, may be substituted at no extra cost.
2.For quantities of 5 cy of total project placement, or less, automatic batching equipment will not be required.
579-2.01 Equipment
A.Power Operated Scarifier. The specific equipment the Contractor proposes to use shall be approved by the Engineer prior to use. Power bush hammers, or other impact type devices which indent or pulverize the surface shall not be allowed under any circumstances.
B.Pneumatic Hammers and other equipment. These shall be subject to the Engineer's approval prior to use. Pneumatic hammers shall meet the requirements of §580 -3.02
C.Other Equipment. All other equipment proposed for use shall be approved by the Engineer prior to actual employment in the work.
579-3 CONSTRUCTION DETAILS. The Contractor shall exercise care during the execution of the
work to avoid damaging or loosening material that is to remain. All damage caused by the Contractor's operations to material that is to remain shall be repaired, or the material replaced as determined by the Engineer. All repair and replacement work shall be done in a manner satisfactory to the Engineer.
579-3.01 Structural Slab Scarification. Scarification of designated areas shall be accomplished with a
power operated scarifier. Inaccessible areas will be scarified with pneumatic hammers.
579-3.02 Reinforcing Bar Exposure
A.Concrete shall be removed from the uppermost reinforcing bars of the structural slab to the limits designated by §579 -1.02B. The Contractor may remove concrete, to the designated minimums, from around both sets of bars in the upper mat.
B.If concrete is removed only from the periphery of the uppermost bar, removal shall be done in accordance with those details indicated on the plans.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Sections 200 - 599 STANDARD SPECIFICATIONS (USC) January 1, 202 4 Volume 2 C. If the Contractor chooses to remove concrete from the periphery of both bars of the upper mat, or if the Engineer determines that:
1.The lower bar is corroded; OR
2.The concrete around the lower bar is deteriorated; OR
3.Delamination extends to the level of, or below, the lower bar; OR
4.The lower bar is debonded; then the concrete shall be removed from the periphery of the lower bar in accordance with the details indicated on the plans.
D.At locations where deteriorated concrete extends beyond the minimum removal limits, the Engineer will order its removal. The Engineer will be the sole determiner of what constitutes deteriorated concrete. This ordered removal shall be part of this work , except that removal of deteriorated concrete below the limit established by §579 -1.02C, shall be part of this work only within the limits of localized areas. Locations where concrete is removed beyond minimum limits, lacking specific orders from the En gineer directing such removal, will be designated as damage locations. All damage locations shall be repaired in a manner satisfactory to the Engineer, at no additional cost to the State.
E.At localized areas, the Engineer may order concrete removal below the plane established by §579- 1.02C. When such removal reaches the uppermost bar of the lower reinforcing bar mat, removal shall be continued until full depth removal is achieved.
F.Care shall be exercised when removing concrete to avoid damaging reinforcement, or other materials, which are to remain in place. Reinforcing steel damaged by the Contractor's operations shall be replaced with new reinforcing steel of the same size, app ropriately spliced. Reinforcing steel splices shall be made in accordance with the details shown on the plans. Other materials designated to remain in place, which are damaged by the Contractor's operations, shall also be replaced.
579-3.03 Full Depth Patches. Refer to the details indicated on the plans.
A.Immediately prior to placing new concrete, the reinforcing bars and the edges of the existing structural slab, which will be in contact with new concrete, shall be blast cleaned. Forms shall be drawn tightly. Preparation and formwork shall be approved by the Engineer prior to any concrete placement. “After blast cleaning has been accepted, thoroughly wet the structural slab surface and all porous surfaces to be in contact with new concrete for at least 12 hours immediately prior to placement. Remove all standing water with oil -free compressed air, and protect the surface from drying, so the concrete remains in a saturated surface dry condition when placing bonding grout.
B.Concrete shall be placed and consolidated in accordance with the requirements of §555-3.04. The uppermost surface of the concrete patch shall be level with the highest of the surrounding prepared surfaces. The uppermost surface shall be intentionally roughened. The Engineer may require that a coarse textured drag be used on the plast ic concrete surface.
C.Concrete shall be cured, in a manner approved by the Engineer, for a minimum of 72 curing hours prior to any other concrete placement work in contact with the curing concrete. A curing hour is defined as any hour, starting from the hour of placement, du ring which the ambient air temperature at
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Sections 200 - 599 STANDARD SPECIFICATIONS (USC) January 1, 202 4 Volume 2 the concrete surface remains at, or above 45 F as measured by a recording thermometer. Curing shall be done by means of quilted covers ( §711-02), or plastic coated fiber blankets ( §711-03). Quilted covers, if used, shall be kept wet during the entire curing period. The use of curing compounds shall not be allowed.
579-3.04 Hydrodemolition Equipment. Hydrodemolition equipment, if approved by the Engineer, shall
be subject to the following:
A.Water Filtration and Disposal. At least two weeks prior to the employment of any hydrodemolition equipment, the Contractor shall submit to the Engineer, for approval, a comprehensive plan for the filtration and disposal of hydrodemolition water. The Contractor is specifically notified that use of the existing bridge drainage system for hydrodemolition water disposal will not be permitted.
B.Water Retention. Hydrodemolition water shall be prevented from running onto, or over all portions of the project site not immediately subject to hydrodemolition work. In addition, the Contractor shall provide shielding, acceptable to the Engineer, that protects traffic and prevents all debris from escaping the immediate work location. A comprehensive plan for accomplishing these requirements shall be submitted to the Engineer, for approval, at least two weeks prior to the beginning of any hydrodemolition work. The Contractor is specifically notified that use of the existing bridge drainage system, for this purpose, will not be permitted. The plan for this work may be submitted as part of the requirements of §579 -3.04A.
C.Adherence. Once approved, the water filtration and disposal, as well as the water retention plans shall be strictly adhered to by the Contractor. Should the Engineer determine that these plans are not being followed as approved, the Contractor will be required to immediately cease work until the conditions are rectified in a manner satisfactory to the Engineer. Should the Contractor fail to rectify the situations to the Engineer's satisfaction, the Engineer may, with the concurrence of the D.C.E.C., require the Contractor to use equipment other than hydrodemolition equipment. No extension of time will be granted, nor will any additional compensation be granted, for either the ceasing of work, or the substitution of equipment, if either one is required as a result of the Contractor's failure to follow the approved plans.
D.Debris Removal. All debris shall be removed quickly enough to prevent rebonding of the debris to the concrete surface. All debris which rebonds shall be removed in a manner satisfactory to the Engineer at no cost to the State. Material designated to be left in place, which is damaged by rebonded debris removal work, shall be repaired in a manner satisfactory to the Engineer at no cost to the State.
579-4 Method of Measurement
579-4.01 Structural Slab Scarification. The work will be measured as the number of square feet stated
in the Estimate of Quantities shown on the plans. Except to allow for progress payments, no field measurements will be taken. Field measurements for progress payments shall not exceed the Estimate of Quantities figure.
579-4.02 Reinforcing Bar Exposure. The work will be measured as the number of square feet of
concrete removed. Quantities will be determined from field measurements.
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NEW YORK STATE DEPARTMENT OF TRANSPORTATION Sections 200 - 599 STANDARD SPECIFICATIONS (USC) January 1, 202 4 Volume 2 579-5 BASIS OF PAYMENT. The unit price bid per square foot shall include the cost of all labor, materials and equipment necessary to complete the work. No additional payment will be made for removals, repairs or replacements made necessary due to the Contractor's operations.
579-5.01 Reinforcing Bar Exposure. The unit price bid per square foot shall include the cost of all
labor, material and equipment necessary to perform full depth patching in localized areas. Full depth concrete removal, and full depth patching, in excess of the limits established for localized areas will be paid for as ext ra work. Payment will be made under: Item No. Item Pay Unit 579.01 Structural Slab Scarification Square Foot 579.02 Reinforcing Bar Exposure Square Foot SECTION 580 - REMOVAL OF STRUCTURAL CONCRETE (Last Revised September, 2016)
580-1 DESCRIPTION. This work shall consist of removal and disposal of structural concrete from
structural concrete elements, concrete approach slabs, concrete bridge pylons, concrete from structural steel members, and other concrete removal and disposal in accordance with the contract documents and as directed by the Enginee r.
580-2 MATERIALS. Not Specified.
580-3 Construction Details
580-3.01 General. The Contractor shall remove structural concrete in accordance with the contract
documents, so as not to damage material designated to remain in place. Reinforcement designated to remain in place shall be cleaned. The Contractor shall only remove structural concrete from elements to remain to the limits shown in the contract documents, in order to preserve structural adequacy and stability. Replacement concrete shall be placed and allowed to reach its initial set pr ior to any additional removals. A minimum of 7 calendar days prior to beginning removal of structural concrete, the Contractor shall provide a Structural Concrete Removal Plan for acceptance by the Engineer. The Structural Concrete Removal Plan shall ide ntify the equipment to be used, the sequence of operations, provisions for protection of structural steel, provisions for removal and disposal of material, and any additional work zone traffic control or worker safety provisions.
580-3.02 Removal of Structural Concrete. The Contractor shall remove concrete to a sound surface in
accordance with the contract documents. The removal operation shall be angled inward creating a key. Small angle corners shall be minimized per contract documents to prevent voids. Reinforcing ba rs and miscellaneous material shall be removed or shall be retained, as shown in the contract documents. After removal of concrete has been performed, surfaces designated to come in contact with new concrete placements shall be cleaned in order to ensure proper bonding with the new concrete. Concrete surfaces to be cleaned shall be thoroughly blast cleaned or abraded by other mechanical means to remove remaining loose material. After blast cleaning or abrading, vertical or overhead surfaces shall be air - blown, or rinsed with water to remove dust. Other surfaces shall be vacuum cleaned. Demolition or chipping hammers shall weigh no more than 45 lbs excluding the weight of the bit and muffler. The hammers shall deliver no more than 1600 blows per minute. The Contractor shall provide the Engineer information from the hammer manufacturer t o assure that these requirements are not exceeded. The air pressure used to power the hammer shall not exceed 110 psi, measured at the air
Source: New York Standard Specifications, 2024 Edition. Pages 429–432 of 1,264.