617.01 646 SECTION 617 – BRIDGE DECK SEALANT
617.01 Description ................................ ................................ ................... 646
617.02 Materials ................................ ................................ ...................... 646
617.03 Reserved ................................ ................................ ....................... 646
617.04 General ................................ ................................ ......................... 646
617.05 Weather Limitations ................................ ................................ ..... 647
617.06 Membrane Application ................................ ................................ . 647
617.07 Method of Measurement ................................ .............................. 649
617.08 Basis of Payment ................................ ................................ .......... 649
DESCRIPTION
617.01 Description
This work consists of furnishing and placing a waterproofing system over a properly prepared concrete bridge deck for the purpose of protecting structural concrete from the deterioration caused by absorption of deicing salts and water. MATERIAL
617.02 Materials
Provide materials as specified in: Bridge Deck Sealant, System A or B ................................ ..... 906.04
617.03 Reserved
CONSTRUCTION REQUIREMENTS
617.04 General
To minimize the amount of construction traffic on the bridge deck seal after placement, do not install the seal until all major phases of roadway construction have been completed. Complete the roadway base and pavement up to the surface course before begi nning installation of the bridge 617.05 647 deck seal. The construction of the bridge deck sealant and overlay may be performed concurrently with or after the roadway surface course. Obtain the Engineer’s approval of all methods used in performing the work before the work is started. If, at any time, the Engineer finds the methods to be unsatisfactory, make changes and improvements as required. Protect concrete surfaces, structural steel, railing, passing vehicles, and similar surfaces from being defaced by sealant. Should defacement occur, clean surfaces on the structure to the Engineer’s satisfaction. Assume sole responsibility and liability for damage to passing vehicles. Limit traffic on the area being treated to the necessary workers and equipment to perform t he work required. Maintain all other traffic on portions of the structure that are not being given the membrane protective coating. At all times, keep traffic off the membrane, and protect the membrane from damage. Repair damage that may occur by patchi ng in a manner satisfactory to the Engineer.
617.05 Weather Limitations
Do not apply sealant during wet weather conditions, when the relative humidity exceeds 85%, or when the surface upon which the sealant i s being placed or the ambient air temperature is below 50 F. Ensure that the surface upon which the sealant is being placed is dry at the time of application.
617.06 Membrane Application
Before applying the membran e, ensure the bridge deck is clean from all debris that would interfere with the membrane adhering to the deck. Check the manufacturer’s recommendations about tack/primer coat between the deck and membrane. Apply the waterproofing membrane to form a butt joint with the face of the curbs. Place the membrane to achieve a shingling effect that will allow any accumulated water to drain toward the low curb or the drainpipes. Overlap each strip longitudinally and transversely a minimum of 4 inches or as recommended by the manufacturer. In all cases, begin the waterproofing at the low point of the surface to be waterproofed so that water will run over and not against the laps. Operate the paving equipment in the direction of the transverse lap of the membrane. 617.06 648 Apply the prefabricated membrane to the bridge deck by either hand methods or mechanical applicators. Use a wide tipped torch to cause tackiness or an adhesive if necessary, to ensure a good seal of the joints. Use hand rollers or other satisfactory pressure apparatus on the applied membrane to ensure firm and uniform contact with the bituminous overlay. Take special care at the curb face to ensure that the membrane uniformly adheres to the concrete. Apply a mastic, of the type specified by the manufactu rer, to the butt joints at face of the curb as shown on the Plans. At all open joints, expansion joints, and at other joints as directed by the Engineer, apply the membrane to form a butt joint with the face of the joint, and apply mastic as shown on the Plans. Ensure that the entire membrane is free of placement defects such as wrinkles, air bubbles, and fishmouths. Patch all torn or cut areas, or narrow overlaps, using a satisfactory adhesive and by placing sections of the membrane over the defective ar ea so that the patch extends at least 6 inches beyond the defect. Roll or firmly press the patch onto the surface. Remove air bubbles, caused by the formation of vapor pressure or out -gassing under the membrane after placement, by puncturing the membrane and repairing the defective area in the manner specified above for cut and torn areas. After completing the membrane waterproofing, cut the membrane with two right angle cuts at all deck drain pipes. Make the cuts to the inside diameter of the drain pipe s, and then turn down the corners of the membrane waterproofing into the drains and lay them in a coating of mastic. Begin applying the bituminous overlay immediately after completing the membrane placement. Apply a bond coat of an acceptable adhesive to t he surface of prefabricated membranes, if required, according to the membrane manufacturer’s recommendations before placing the overlay. Overlay the waterproofing system with asphaltic concrete of the type and in the quantity shown on the Plans. All requir ements of Part 4 of these Specifications shall apply to this construction with the following revisions and additions:
1.The paving operation shall be in the same direction as the end laps of the membrane. 617.07 649 2. The requirements f or automatic grade and slope controls on the paver will be waived.
3.The density requirements will be waived; however, all other applicable compaction requirements in 407.15 will apply. Give the first asphalt concrete lift a br eakdown roll as soon as possible after the paving machine has passed. Deposit, spread, and roll the overlay so as not to damage the membrane. COMPENSATION
617.07 Method of Measurement
The Department will measure and pay for bridge deck sealant, complete in place, by the number of square yards of bridge deck and approach slabs covered. The Department will measure and pay for tack coat, when used, and bituminous layers as provided for in 403.
617.08 Basis of Payment
The Department will pay for accepted quantities at the contract prices as follows: Item Pay Unit Bridge Deck Sealant Square Yard Such payment is full compensation for the preparation of surfaces and furnishing and applying the waterproofing system complet e in place. 619.01 650 SECTION 619 – POLYMER MODIFIED CONCRETE BRIDGE DECK OVERLAY FOR NEW AND EXISTING BRIDGES
619.01 Description ................................ ................................ ................... 650
619.02 Materials ................................ ................................ ...................... 650
619.03 Propor tioning ................................ ................................ ............... 651
619.04 Equipment ................................ ................................ .................... 651
619.05 Limitations ................................ ................................ ................... 654
619.06 Hydro -Demolition ................................ ................................ ........ 655
619.07 Cleaning ................................ ................................ ....................... 655
619.08 Mixing ................................ ................................ .......................... 655
619.09 Placing, Consolidating, and Finishing ................................ .......... 656
619.10 Texturing ................................ ................................ ...................... 656
619.11 Curing ................................ ................................ .......................... 656
619.12 Reconstruc tion ................................ ................................ ............. 657
619.13 Traffic Loading ................................ ................................ ............ 657
619.14 Method of Measurement ................................ .............................. 658
619.15 Basis of Payment ................................ ................................ .......... 658
DESCRIPTION
619.01 Description
This work consists of constructing a polymer modified concrete (PMC) bridge deck overlay fo r the purpose of protecting structural concrete from the deterioration caused by absorption of deicing salts and water. MATERIALS
619.02 Materials
Provide materials as specified in: Portland Cement (Type I or Type III) ................................ .... 901.01 Fine Aggregate (Natural Sand) ................................ .............. 903.01
Source: Tennessee Standard Specifications for Road and Bridge Construction, 2021 Edition. Pages 655–658 of 1,072.