SECTION 828 MASONRY COATING MATERIALS
828.01 DESCRIPTION. This section covers requirements for materials to be used as
surface finishes for designated surfaces of cement concrete structures. The masonry coatings must hide form marks, patches, and other minor irregularities and prevent deterioration, spalling, and other damage to the concrete due to the action of the weather and deicing chemicals.
828.02 APPROVAL. Select masonry coatings from the Department’s List of Approved
Materials. Use a material that is readily rec ognizable by its name, trademark, container, or other feature. Conform to the Department’s testing criteria to be placed on or remain on the Department’s List of Approved Materials. For initial approval submit representative samples, color chip (see Subsection
828.02 05), and duplicate copies of certified test reports to the Division of Materials for
review and approval. An independent testing laboratory acceptable to the Department shall perform the tests described herein on representative samples of the material. Tests listed herein are the minimum testing requirements to be met. When requested in writing, the Engineer may accept materials based on conformance to the same type of test but differing on minor procedural points. Attach copies of test procedures which differ from those stated herein. In addition to the material, provide brochures or booklets containing detailed instructions and explanatory remarks about surface preparation, application procedures, and other pertinent operations. The Department will allow masonry coating, on those areas designated to receive masonry coating to serve as a curing membrane, provided water retention requirements of ASTM C309 are met, the product technical literature permits its use as a curing membrane, and the product is so identified on the List of Approved Materials. The Department will continue to include the masonry coatings on the list contingent upon receiving an annual certification containing the following information:
1.A statement that the masonry coating to be furnished during the particular calendar year is of the same composition as that previously approved for inclusion on the approved list.
2.A statement that the masonry coating conforms to the appropriate requirements of the Kentucky Standard Specifications for Road and Bridge Construction.
3.A statement that notification will be made to the Division of Materials of any changes in composition for review and approval before furnishing the material to projects.
828.02.01 Freeze-Thaw Test. Cast and cure 3 concrete specimens no less than 4 by
4 by 6 inches. Moist cure specimens for 14 days and then dry in room air at 60 to 80 F for 24 hours before applying masonry coating. Ensure that there is no excessive oil on specimen forms. Coat sides of specimens (brush permi tted) according to the manufacturer’s directions at a rate of 50 10 square feet per gallon and cure at room temperature for 48 hours; after which:
1.Immerse in water at room temperature 60 to 80 F for 3 hours and remove.
2.Place in cold storage at -15 F for one hour and remove.
3.Thaw at room temperature 60 to 80 F for one hour.
4.Repeat steps 1), 2), and 3) to complete a to tal of 50 cycles. At the end of 50 cycles of the Freeze-Thaw Test, ensure that the coated specimens shows no visible defects.
828.02.02 Accelerated Weathering. Test according to ASTM D 822. Apply at an
application rate of 50 10 square feet per gallon. Test for 335 hours in an Atlas Type XW Sunshine Arc Weatherometer or for 500 hours in an Atlas Type DMC Enclosed Violet 828-1 Carbon Arc Weatherometer or equivalent. Perform the test in 120-minute cycles consisting of 102 minutes of light and 18 minutes of light and demineralized water. At the end of the exposure test, ensure that there is no checking, cracking, or loss in film integrity, and no other film defects. Ensure that the coating shows no more than very slight color change.
828.02.03 Salt Spray Resistance. Apply the masonry coating to concrete at a rate of
50 10 square feet per gallon, and test the coating according to ASTM B 117. Expose the coating to a 5 percent sodium (salt) solution for 300 hours, and maintain it at 90 2 F during the period of exposure. Ensure that it shows no loss of adhesion or deterioration at the end of the 300 hours.
828.02.04 Fungus Growth Resistance. Ensure that the masonry coating passes a
fungus resistance test as described by Federal Specification TT-P-29. After a minimum incubation period of 21 days, ensure that no growth is exhibited on the coating.
828.02.05 Color. Color shall match Federal Standard 595B standard color FS 36492
or as specified in the contract. 828-2 SECTION 829 —HARDWARE FO R TIMBER STRUCTURES
829.01 GENERAL. Furnish fasteners that are industry recommended for the timber type
being used. Fasteners shall include nails, spikes, bolts, dowels, washers, and lag screws.
829.02 BOLTS. Use machine bolts having square heads and nuts, and ensure that screw
threads make a close fit in the nuts. Furnish machine bolts, drift-bolts, and dowels of either wrought iron or medium steel. Designate the weight of bolts as “American Standard Regular.”
829.03 WASHERS. Furnish washers that either are cast O-gee or malleable castings or
are cut from medium steel or wrought-iron plate, as specified in the Contract.
829.04 NAILS. For nails, use cut or round wire of standard form. Furnish cut or wire
spikes, or boat spikes, as specified in the Contract. 829-1
Source: Kentucky Standard Specifications for Road and Bridge Construction, 2019 Edition. Pages 623–624 of 718.