Section 503 Section 503 No separate measurement will be made for reinforcing steel, wire mesh, longitudinal joints, polyethylene sheeting and asphalt pavement for repair of shoulders and maintenance of traffic items required. The plans may also provide for welding of the reinforcing steel as an optional method available to the Contractor. This method reduces the width of the lap area from 20 inches to eight inches which will reduce the size of the repair areas. If the Contractor elects to use the optional method, the subsequent reduction in plan quantities will not be justification for adjustment of contract unit prices as provided in Subsection 104.02.
503.05 Basis of Payment. The accepted quantities of saw cuts, concrete for base repairs,
smooth dowel bars, tie bars, and concrete pavement will be paid for at the contract unit prices which shall be full compensation for completing the work, furnishing all labor, equipment, tools, materials, and bituminous plant mix required for shoulder repair. Removal and disposal of pavement and base materials shall be made under appropriate items under Section 202. The price for each item of work shall include the cost of continuous maintenance of traffic and protective services as required by the De partment's Traffic Control Plan. This shall include all required individual traffic control devices. Payment will be made under: 503-A: ___" and Variable Type Concrete Pavement, Type Finish - per square yard 503-B: Saw Cut, Longitudinal Joints - per linear foot 503-C: Saw Cut, ___" - per linear foot 503-D: Concrete for Base Repair - per cubic yard 503-E: Tie Bars, No. ___ Deformed, Drilled and Epoxied or Grouted - per each 503-F: ___" Smooth Dowel Bars, Drilled and Epoxied or Grouted - per each SECTION 508 - SILICONE SEALED JOINTS
508.01 Description. This work shall consist of clean ing and sealing joints in accordance
with the plans and these specifications.
508.02 Materials . The silicone sealant material used in this construction shall meet the
requirements of Subsection 707.02.1.4. The backer rod shall meet the requirements of Subsection 707.02.1.5.
508.03 Construction Requirements.
508.03.1 Cleaning. Joints shall be clean, dry and fros t free when the sealant is applied.
Formed joints shall be thoroughly cleaned to remove all form release agents, curing compound residue, laitance, or any other foreign materials. All joints shall be thoroughly cleaned by sandblasting each face separately to th e depth of the sealer and backer rod. The cleaning operation of existing joints shall ensu re that the concrete joint surfaces which are to receive the new joint sealant and backer rod are free of all debris, discoloration and stain, as well as any and all other forms of contamin ation. If a clean exposed concrete surface cannot be obtained by sandblasting, the joints shall be refaced with a power driven concrete saw with diamond and/or abrasive blades. The refaced joints shall be washed and sandblasted as set forth above. Immediately prior to installation of the backer rod, the joints shall be cleaned with compressed air which is free of moisture and oil. Wiping fingers on cleaned surface of joints shall not s how evidence of dust. The joints shall be completely free of sand, oil and moisture. Material in expansion joints shall be removed to the required depth with a power saw and/or router in such a manner as not to damage the expansion material which is to remain in place.
508.03.2 Installing Backup Material. When shown as a requirement of the contract and
after the final cleaning, a resilient rod type backup material shall be installed with a positioning device to ensure conformity with the dimensions shown on the plans. The rod shall be compatible with the sealant and no bond or reaction shall occur between the rod and the sealant. Unless otherw ise designated, the rod diameter shall be one-eighth of an inch (1/8") greater than the joint width.
508.03.3 Installing Silicone Sealant. The installation of the sealant is to be performed
as soon after placing the backer rod as reasona bly possible to ensure that joints are still clean and dry. In the event a joint does be come contaminated, damp, or wet, the backer rod is to be removed and the joint cleaned and dried with a new backer rod reinstalled prior to placing the sealant. The ambient temperature at time of placement must be 40°F or higher. The sealant shall be applied by pumping only. The pump shall be of sufficient capacity to deliver the necessary volume of ma terial to completely fill the joint to the specified width and height of sealant in one pa ss. The nozzle shall be of sufficient size and shape to introduce the sealant inside the join t with sufficient pre ssure to prevent voids occurring in the sealant and force the sealant to make contact with the joint faces. This is especially critical in large joints. The sealant, if not of the self-leveling type, shall be tooled to provide the specified recess depth, thickness and shape as shown on the plans. Sufficient force or pressure shall be applied to the sealan t in this tooling operation to force the sealant against the joint faces to ensure satisfactor y wetting and bonding. The sealant shall be placed to reasonably close conf ormity with dimensions and sh ape shown on the plans. Any unreasonable deviation will be cause for rej ection and necessary corrective action will be made by the Contractor.
508.03.4 Cleaning Pavement . After a joint has been sealed, all surplus sealant on the
pavement shall be promptly removed.
508.03.5 Opening to Traffic. Traffic shall not be permitted over the sealed joints until
the sealant is tack free.
508.04 Method of Measurement. Silicone sealed joints will be measured by the linear
foot.
508.05 Basis of Payment. Silicone sealed joints will be paid for at the contract unit price
per linear foot, which shall be full compensation for satisfactorily completing the work. The price for this work shall include the cost of continuous maintenance of traffic and protective services as required by the Department 's Traffic Control Plan. This shall include all required individual traffic control devices. Payment will be made under: 508-A: Silicone Sealed Joints - per linear foot SECTION 510 - REPAIR OF CONCRETE PAVEMENT
510.01 Description. This work consists of surface preparation, including cleaning, and
placement of polymer concrete in spalled ar eas of concrete pavement, or other areas directed by the Engineer, in accordance with these specifications and in reasonably close conformity with the lines and grades of the existing pavement.
510.02 Materials. The polymer concrete shall be one of the approved materials listed in
the MDOT’s “Approved Products List” un der the List of Approved Rapid Setting Commercial Grouts and Patching Compounds for use in the repair of punch-outs (spall repairs) in concrete pavements.
510.03 Construction Requirements.
510.03.1 Surface Preparation. All spall areas one inch in diameter or larger shall be
cleaned and prepared for receiv ing the polymer concrete. The Contractor shall remove all loose, cracked or deteriorated concrete from the spalled areas using a mason or shop hammer and if necessary, a jack hammer not la rger than 20 pounds. Spalled areas shall first be sand blasted, or other method approve d by the Engineer, until concrete exhibits an obvious color change, and then air blasted to remove all loose debris.
510.03.2 Manufacturing and Placing of Polymer Concrete . Spalled areas must be
completely dry prior to prim ing and placement of polymer co ncrete. Priming resin shall be mixed according to the manufacturer's published recommendations. The entire area of spalls plus an additional two inches around th e circumference of the area shall be primed using a brush. Priming resin may be allowed to gel prior to placing resin/aggregate. The resin shall be mixed with the aggregat e in accordance with the manufacturer's recommendation until the aggregate is thoroughly wetted with the resin. The Contractor shall first fill, tamp, trowel and screed the spalled area parallel to the centerline of the roadway, then apply a surface coat of dry graded aggregate and tamp into wetted aggregate to provide skid resistance. The polymer concrete shall be allowed to cure for two (2) hours prior to opening the area to traffic.
510.04 Method of Measurement. Graded aggregate and resin used in polymer concrete
pavement repair of spalled areas will be meas ured by the cubic foot of aggregate and by