8−190 839.05.2 Full-Depth Removal . The accepted quantity of “Full-Depth Removal and Disposal of Bituminous Pavement from Concrete Bridge Decks” will be paid for at the contract unit price per square yard as set forth in the Proposal, which price will constitute full compensation for the complete removal and disposal of bituminous pavement, including waterproofing membrane, and all materials, labor, tools, equipment, saw cutting, and all incidentals necessary for the proper completion of the work specified, shown on the Plans, complete and accepted by the Engineer. DECK SURFACE CONCRETE REMOVAL BY HYDRODEMOLITION 840.01 DESCRIPTION . This work consists of the removal of deteriorated concrete from reinforced concrete bridge deck surfaces by the use of hydrodemolition methods, the provision of adequate containment measures under the bridge deck, the control and diversion of runoff during the hydrodemolition operations, disposal of all concrete and other materials removed by hydrodemolition, and all other incidentals as necessary to complete the work in accordance with the requirements of these Specifications. 840.02 EQUIPMENT . The hydrodemolition equipment shall consist of filtering and pumping units operating in conjunction with a remote controlled robotic device, and if applicable, shall be capable of using river, stream or lake water. The withdrawal of water from any body of water under the jurisdiction of the RI Department of Environmental Management (RIDEM) or the Coastal Resources Management Council (CRMC) shall not be permitted unless such use is authorized by a permit issued by the appropriate regulatory agency. The hydrodemolition equipment shall be capable of producing a water jet through an orifice at a pressure of at least 17,000 psi. The machine shall move the jet transversely across the area and forward or backward so that the entire deck is exposed to the water jet. The movement of the jet shall be accomplished by mechanical means; no manual movement of the water jet will be allowed except at inaccessible areas such as, but not limited to, proximity to the curb and temporary barriers, and at bridge deck expansion joints. The equipment shall operate at a noise level of less than 90 decibels at a distance of 50 feet from either the powerpack unit or the remote robot. 840.02.1 Controls. The hydrodemolition equipment shall have sufficient controls to control and vary the following functions of the machine:
a.Water pressure, b. Angle and distance of the orifice relative to the deck surface, c. Limits of transverse and longitudinal movement of the orifice, d. Speed of the orifice in the transverse and longitudinal direction.
840.02.2 Submissions and Qualifications . Post-qualification by the Engineer of the hydro-
demolition operation is required. The Contractor shall be responsible for any delay if the post- 8−191qualification criteria are not satisfied. The Contractor shall submit the required post-qualification information on the hydro- demolition operations for approval by the Engineer . The Contractor may submit more than one set of documentation.
a.Minimum Requirements . The post-qualification documentation shall include, as a minimum, the following:
1.The name and location of all projects completed, a brief description of work performed, equipment specifications, estimated production rates, and references of personnel.
2.Specifications for all equipment to be used for the concrete removal, surface preparation and clean-up operations.
3.Anticipated rate of production.
4.An inventory of all common spare parts and replacement accessories required for the equipment.
5.Number of personnel, machine operators and supervisors, and their relevant experience.
6.Proposed method and sequencing of operation for all phases of the concrete removal and surface preparation operations. The above post-qualification criteria shall appl y regardless of the arrangements made by the Contractor to accomplish the hydrodemolition work. It shall be the Contractor’s responsibility to ensure that subcontractors meet the above post-qualification requirements. Approval of the hydrodemolition requirement s by the Engineer shall not relieve the Contractor of any of his responsibility under the Contract for the timely and successful completion of the work. 840.02.3 Shielding Requirement . Shop drawings showing details, design and catalog cuts for the temporary protective shield system shall be submi tted to the Engineer for approval at least thirty
30.days prior to starting work. This shield system is to protect pedestrians, vehicle and/or railroad traffic and utility infrastructure, and to ensure that no material or debris associated with the hydrodemolition operation falls below the struct ure. This system shall be designed for the anticipated weight of all material to be supported. 840.03 CONSTRUCTION METHODS . The concrete shall be removed by hydrodemolition equipment which produces a high-pressure water stream capable of removing concrete, asphalt, oil, dirt, concrete laitance and rust from the ex posed reinforcing bars by direct impact. Rotary milling or mechanical abrading machines will not be allowed. The Contractor shall comply with all applicable regulations and permit requirements with respect to the use and disposal of water for hydrodemolition operations. 8−192
840.03.1 Concrete Removal. The hydrodemolition equipment shall be adjusted such that the
depth of concrete removed from areas of “sound” c oncrete is approximately ½ inch or as specified on the Plans. In areas where deteriorated concrete is encountered, the removal depth shall be established by the Engineer. The trial test procedure used to assure that the correct amount of sound concrete is removed by the hydrodemolition machine shall be as follows: The Engineer will locate and record the limits of a trial test of sound concrete approximately 30 square feet in size. An area of sound concrete shall be defined as an area free from chemical defects, delamination, spalling and/or cracking. To locate and identify the area of sound conc rete, the Contractor shall, in the presence of the Engineer and following the removal of the bituminous wearing surface, test the deck surface for soundness. Chain dragging, tapping with a hammer or other means of testing approved by the Engineer will be required. The hydrodemolition machine will then be advanced over this area and the operating parameters adjusted to remove 2 inches of sound concrete with in the test area. The depth of concrete removal shall be measured by the Engineer. If the adjustment is such that the machine is removing too much or too little concrete, the machine will be calibrated and the above procedure shall be repeated as many times as nece ssary to achieve the required depth. One (1) test shall be performed for each stage of deck surface concrete removal, as shown on the Contract Drawings. The equipment shall be operated by qualified personnel certified by the equipment manufacturer. Operator certification shall be submitted to the Engineer for approval before beginning the concrete removal operation. The Contractor shall have available servic e personnel and an inventory of common wear parts and replacement accessories for the equipment to guarantee that the removal operation will not be interrupted for an extended period of time in the event of an equipment breakdown. A list of operating parameters to be used for the hydrodemolition work shall be submitted to the Engineer prior to the commencement of concrete removal. Once the operating parameters are established by programming or calibration, they shall not be changed as the machine progresses across the bridge deck except to prevent unnecessary removal of sound concrete below the required minimum removal depth. If, in the opinion of the Engineer, after calibrating the hydrodemolition equipment and beginning production work in a particular area, insufficient removal of concrete is being obtained, the Contractor shall re-calibrate the equipment for that area to assure removal of concrete to the specified depth. Any areas of the prepared surface contaminated as a result of the Contractor’s operations by oil or other materials detrimental to maintaining a good bond shall be removed to such depth as may be required. Such cleaning or removal shall be performed at no additional cost and the Contractor shall be responsible for any resulting delays. 840.03.2 Control of Debris and Water . The Contractor shall provide structurally adequate shields, to be approved by the Engineer, so that the water jet and broken concrete will not be a hazard to workers, traffic on adjacent lanes, or pedestrians and property in areas below or adjacent to the 8−193bridge. The water shall be continually drained from the bridge and shields so that excess water will not accumulate, in a manner that will not damage the area below the bridge. Broken concrete, asphalt and all other debris shall be removed and transported from the site and legally disposed of by the Contractor. All debris shall be removed immediately following the hydrodemolition operation by employing a vacuum recovery system to prevent re-bonding to the remaining surface. Any debris which is allowed to resettle or re-bond to the surf ace of the sound concrete shall be removed by the Contractor at no extra cost to the State. Special care shall be exercised to avoid damage to the remaining sound concrete and reinforcing steel. Methods for the Control, Maintenance, and Disposal of Hydrodemolition Runoff shall conform to the requirements of SECTION 214 of these Specifications. The runoff control features shall be in place and operational prior to beginning concrete removal. Runoff shall be prevented from running across travel lanes, into bridge drainage devices or into areas below or adjacent to the bridge, except for the containment basin. 840.03.3 Reinforcing Steel . Following the hydrodemolition operation, all exposed reinforcing steel shall be inspected to ensure that it has been cleaned of all rust and corrosive products, including oil, dirt, concrete fragments, laitance, loose scale and other coatings of any character that would destroy or inhibit the bond with the new concrete. Exposed reinforcing steel not adequately cleaned by the initial hydrodemolition process shall be re-cleaned to the satisfaction of the Engineer. If in the opinion of the Engineer, the bars are deteriorated such that they have lost 1/4 or more of their original diameter, the Contractor shall replace the steel as specified in accordance with the provisions of either the Contract or SECTION 818; PORTLAND CEMENT CONCRETE BRIDGE DECK REPAIR , of these Specifications. When cleaned reinforcing steel is exposed for mo re than seven (7) calendar days, measures shall be taken by the Contractor to protect the st eel from contamination by the type of materials indicated above. Reinforcing steel contaminated as a result of the Contractor’s failure to provide adequate protection shall be re-cleaned at no extra cost to the State; any resulting delay shall be the Contractor’s responsibility. A light coating of rust can be expected to form on the reinforcing; this shall not be considered to constitute contamination. 840.03.4 Concrete Placement . The placement and finishing of concrete for deck repairs and deck overlays shall be as specified in SECTION 818; PORTLAND CEMENT CONCRETE BRIDGE DECK REPAIR , of these Specifications.
840.04 METHOD OF MEASUREMENT . “Deck Surface Concrete Removal by Hydrodemolition” will
be measured by the number of square feet of deck surface actually removed in accordance with the Plans and/or as directed by the Engineer. 840.05 BASIS OF PAYMENT . The accepted quantity of “Deck Surface Concrete Removal by Hydrodemolition” will be paid for at the contract unit price per square foot as listed in the Proposal. The price so-stated shall constitute full compensation for the removal of the bridge deck surface 8−194 concrete to the limits shown on the Contract Drawings, including all labor, equipment, tools, design and installation of protective shields, runoff diversion and all incidentals necessary for proper completion of the work specified and shown on t he Plans, complete and accepted by the Engineer. No additional payment shall be made for the remova l of deteriorated concrete in excess of 2 inches with the hydrodemolition equipment unless specified on the Plans, or for any miscellaneous trim work along the curb, temporary barriers, or on the deck, as required to fulfill the requirements of this Specification. SECTION 841 PRE- AND POST-CONSTRUCTION CONDITION SURVEYS
841.01 DESCRIPTION. The work to be performed under this item consists of all labor, equipment,
and materials associated with conducting pre- and post-construction condition surveys of all structures and/or properties identified in the Contract Documents. In addition, structure condition surveys shall be conducted of all structures within 200 feet, unless otherwise noted, for all vibration-inducing ac tivities resulting from the Contractors means and methods, in accordance with the Contract Documents. Items for which condition surveys shall be conducted include but shall not be limited to, the following: • Existing bridge foundations, abutments and piers, and superstructures; • Private commercial and residential buildings and other structures; • Retaining Walls; • Culverts The Contractor shall submit a comprehensive list of all affected properties and structures as part of the project schedule development process Contractor’s Submittal List. Pre-construction surveys shall be conducted in accordance with the Contract Documents, and shall be conducted prior to the commencement of construction operations and vibration- inducing activities. This includes driving and removal of piles and sheeting, drilling, boring, blasting, structural demolition, and any other vibration-induci ng activity resulting from the Contractor’s means and methods. Work which may result in damage to properties or structures may not commence until all pre-construction survey reports have been submitted by the Contractor and approved by the Engineer. Post-construction surveys shall be performed upon substantial completion of the contract, with the consent of the Engineer, and shall follow the same procedures and protocols utilized for the pre-construction surveys. All damage sustained by the properties or structures surveyed due to construction operations shall be repaired by the Contractor to the satisfaction of the Engineer at no additional cost to the State or property owner.
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 524–528 of 826.
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837 Repairs to Structural Concrete Masonry with Integrally Colored Concrete or Patching Mortar ……………. 8-183 Section 838 Saw Cut in Existing Concrete Walls …………………………..………. 8-187 Section 839 Remove and Dispose Bituminous Concrete Pavement From
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