Attachment E.pdf
PDF 41 KB Posted
- Attached to
- Abbeville County Bridge
- Solicitation number
- 5400020272
- Issued by
- Abbeville County, South Carolina
About this file
This document is a technical specification attachment for an Abbeville County Bridge project in South Carolina, detailing concrete surface finishing and coating requirements. The specifications establish a 28-day concrete cure period before application of final finish coating, with allowance for shorter cure times if recommended by the material manufacturer. The final finish coating must be applied to clean, surface-dry concrete using a high-build spray finish material applied at a rate of 55±5 square feet per gallon. The coating must be factory-mixed, applied as a single spray coat, and result in uniform color, coverage, and texture. Application must be performed by specially trained and skilled operators using spray equipment and procedures approved by the coating manufacturer. The specified color is Near White (Federal Shade No. 37778) with smooth texture, and the spray coating material must be suitable for exterior application.
The coating material, whether solventborne or waterborne, must meet stringent durability and performance standards including a minimum of 5,000 hours durability by accelerated weathering testing per ASTM G 153, 50 freeze-thaw cycles without detrimental effect, and 300 hours minimum salt spray testing per ASTM B 117 without loss of adhesion. Solventborne coatings must comply with specific requirements including vinyl toluene acrylic copolymer resin with minimum 48 sward hardness, mineral spirits solvent, minimum 55% pigment by weight, minimum 35% non-volatile vehicle, maximum 3.5 pounds per gallon VOC, and minimum 68% total solids by weight. Waterborne coatings must use 100% pure acrylic copolymer emulsion with butyl acrylate or methyl methacrylate monomers, water as solvent, minimum 55% pigment by weight, minimum 20% non-volatile vehicle, minimum 62% total solids by weight, and pH between 9.0 and 10.5. Moisture vapor permeability for all coatings must be minimum 0.4 metric perms per ASTM E 96.
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Other files
| File | Type | Posted |
|---|---|---|
| Solicitation.pdf | ||
| Attachment F.docx | DOCX document | |
| Attachment B.pdf | ||
| Attachment C.pdf | ||
| Attachment D.pdf | ||
| Attachment A.pdf |
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Text version
702.4.11.3
702.4.11.3 Application of Final Finish Coating
702.4.11.3 Allow the concrete to cure for 28 days before application of finial finishing coat. A shorter cure time may be allowed by the RCE if it is recommended by the manufacturer of the material. After the surface is cleaned, apply the coat-ing before contamination occurs. If adverse weather or other obstacles pre-vent a timely coating application, re-clean the surface as determined by the RCE. Make certain that the surface is clean and surface dry in accordance with the manufacturer's recommendations before application of the coating. If the coating is sprayed, use application equipment recommended by the manufacturer of the coating. Make certain the spray procedure is as ap-proved by the coating manufacturer. Ensure that the coverage per gallon of the coating is in accordance with these specifications and does not exceed 60 square feet per gallon.
702.4.11.4
702.4.11.4 Sprayed Final Finish
702.4.11.4 Use a material for the high-build spray finish coat that is a factory mixed coating applied as a single spray coat at the rate of 55(± 5) square feet per gallon of coating. Ensure that the finish coat is uniform in color, coverage, and texture. The uniform coverage may vary in dry mil thickness depending on the properties of the product being used, but minimize variation by strict control of the application rate. Apply the spray coat uniformly to dry and clean surfaces that have received the initial surface finish. Allow the concrete to cure 28 days before application of the final finish coating. A shorter cure time may be allowed by the RCE if it is recommended by the manufacturer of the material. Apply the sprayed finish strictly in accordance with the written in-struction of the product manufacturer. Ensure that the actual application of the material is done by an operator specially trained for this work and is skilled in the application of the sprayed finish.
702.4.11.4 Ensure that the spray material is for exterior coating. Use the color Near
White (Federal Shade No. 37778) with smooth texture. The spray coating material may be solventborne or waterborne. Make certain that it meets the following requirements:
A. Durability by accelerated weathering testing is 5000 hours minimum in accordance with ASTM G 153.
B. Durability by freeze thaw testing is 50 cycles minimum without detri-mental effect. Conduct the test procedure by means of a test cham-ber capable of maintaining a -15ºF temperature for 1 hour and a +70ºF temperature for 1 hour, which constitutes one freeze thaw cy-cle.
702.4.11.4 702.4.11.5
C. Durability by salt spray testing is 300 hours minimum in accordance with ASTM B 117 without loss of adhesion or deterioration of the coating.
D. Moisture vapor permeability is 0.4 metric perms minimum in accor-dance with ASTM E 96.
702.4.11.4 Make certain that the solventborne coating complies with the following re-quirements:
A. The resin is a vinyl toluene acrylic copolymer resin having a sward hardness of 48 minimum when tested at 33.3% solids.
B. The solvent is mineral spirits (aliphatic).
C. The pigment is 55% minimum by weight.
D. The non-volatile vehicle (% by weight of vehicle) is 35% minimum.
E. VOC is 3.5 pounds/gallon maximum.
F. The coating total solids is a minimum 68% by weight.
702.4.11.4 Ensure that waterborne coating complies with the following requirements:
A. The resin is 100% pure acrylic copolymer emulsion. Monomers are Butyl acrylate or methyl methacrylate. Vinyl acetates and styrene-modified copolymers are not allowed.
B. The solvent is water.
C. The pigment is 55% minimum by weight.
D. The non-volatile vehicle (% by weight of vehicle) is 20% minimum.
E. The coating total solids is a minimum 62% by weight.
F. The pH is 9.0 to 10.5.
File details come from the government source that posted it. Updated .