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515.02 Materials Materials shall meet the requirements of Type 1c penetrating silane
concrete sealers, and be listed on the Department Qualified Pro ducts List (QPL).
515.03 Surface Preparation On surfaces to be treated, all void s shall be filled with
mortar and the entire surface shall be dressed by dry rubbing t o remove form marks and blemishes to present a neat appearance. The concrete shall rem ain dry for at least 48 hours before treatment and shall be free of laitance, oil, grease, di rt, dust, curing compound or any other deleterious materials. All traces of dust shall be remov ed immediately before applying the silane sealer. The treatment shall not be done until at least 14 days after ca sting the concrete, or in accordance with the manufacturer’s published recommendations, a nd completed at least 24 hours before the treated por tion is opened to traffic.
515.04 Application The application rate and method of applicat ion shall be in
accordance with the manufacturer’s published recommendations. When practical, treatment of the concrete surfaces shall be com pleted before exposure to deicing salts. The temperature of the concrete to be treated s hall be above 40 degrees Fahrenheit at the time of application, or per the manufacturer’ s published recommendations.
515.05 Method of Measurement Protective coating for concrete s urfaces will be
measured for payment by the square yard or lump sum unit as spe cified, satisfactorily applied and accepted.
515.06 Basis of Payment Protective coating for concrete surfac es will be paid for at the
contract unit price per square yard or lump sum, as specified. Payment will be made under: P a y I t e m P a y U n i t
515.20 Protective Coating for Concrete Surfaces Squar e Yard
515.21 Protective Coating for Concrete Surfaces Lump Sum
SECTION 516 - STYRENE-BUTADIENNE LATEX MODIFIED PORTLAND CEMENT MORTAR AND CONCRETE Reserved SECTION 517 - SHOTCRETE Reserved SECTION 518 - STRUCTURAL CONCRETE REPAIR 5-121
518.01 Description This work shall consist of repairing existi ng structural concrete as
shown on the Plans and/or as dir ected by the Resident. Repair ing structural concrete shall include removal and disposal of deteriorated concrete, cleaning exposed reinforcing steel, cleaning of concrete surfaces in repair areas, application of b onding agent and placing and curing repair material. All work shall be in conformance with applicable provisions of Sections 202, 502, and 503. Upward Facing Surfaces are defined as any concrete surfaces whe re the slope is less than or equal to 15 percent from the horizontal. Overhead Surf aces are defined as any concrete surfaces where the slope is overhanging more than 15 p ercent from plumb. All other surfaces shall be defined as Vertical Surfaces.
518.02 Repair Materials A material that has been NTPEP tested and from the
Department’s Qualified Products L ist (QPL) of Rapid Setting Con crete Patching Materials may be used instead of concrete for any depth of placement, at the Contractor’s option, providing that all requirements of the manufacturer’s published recommendations are met. All materials used for repair of concrete or reinforcing steel shall meet the applicable requirements of Division 700 as specified in Standard Specifica tion Sections 502 and 503, respectively. When concrete is used as the repair material, it shall conform to the requirements of Table 1 of Section 502.05 for Class A Concrete. Where the depth of placement is less than 1 inch, the repair ma terial used shall be one of the products listed on the Department’s QPL of Rapid Setting Co ncrete Patching Materials. Where the depth of placement is equal to or greater than 1 inch , the Contractor may use concrete as the repair material. When concrete is used, the co arse aggregate shall conform to the requirements of the following tables. Thickness of Placement Coarse Aggregate Gradation Designation 1 to 3 inches 3 to 6 inc hes > 6 inches SP-1-7 x SP-1-78 x SP-2-8 x SP-2-89 x Class AA x Class A or AA x x Coarse Aggregate Gradation Designation Sieve Designation Percent By Weight Passi ng a Square Mesh Sieve ¾ in ½ in ⅜ in No. 4 No. 8 No. 16 No. 50 No.200 SP-1-7 100 90-100 40-70 0-15 0-5 - - 0-1.5 SP-1-78 100 90-100 40-75 5-25 0-10 0-5 - 0-1.5 SP-2-8 100 85-100 10-30 0-10 0-5 - 0-1.5