DMS-8101, Structural Steel Paints - Performance

Transcription

1 DMS-8101, Structural Steel Paints - Overview (Formerly D , High Corrosion Environment Structural Paints). Effective Dates: August 1998 August This specification shall govern the materials, composition, manufacture, and testing of coatings and related materials. Bidders and/or Suppliers Requirements All prospective bidders and/or suppliers are notified that, before any material is considered, it shall be of manufacture and product code or designation shown on the list of approved manufacturers of materials covered by this specification and maintained by Materials & Pavements Section of the Construction Division (CST/M&P) of TxDOT. Responsibility for Hazards and Compliance with Health and Pollution Regulations It is not a requirement or intent of this specification to cause infringement of any health, safety, and/or environmental regulation(s). Some paints are harmful to the health and since the Engineer cannot anticipate or control the many different conditions under which cleaning and painting may be accomplished, the Contractor is reminded that he is responsible for the safety of his operation and for compliance with all federal, state, or local regulations. NOTE: The material manufacturer shall supply a Material Safety Data Sheet to comply with OSHA's Hazard Communication Standard 29 CFR Sampling and Testing All products required to meet these specifications for use on projects under TxDOT jurisdiction are required to be tested. All materials for testing shall be supplied by the Contractor at the Contractor s expense. Sampling Sampling shall be in accordance with CST/M&P Manual of Testing Procedures. Any questions shall be addressed to the Texas Department of Transportation, Construction Division, Director of Materials & Pavements Section (CP51), 125 East 11th Street, Austin, TX Testing Departmental Material Specifications 1 TxDOT 08/98 8/04

2 Testing shall be in accordance with CST/M&P Manual of Testing Procedures. Any questions shall be directed to the above address. All tests will be made by TxDOT or by a commercial laboratory designated by TxDOT. Specifications, codes, acceptable practices, etc. not specifically listed in this specification are not applicable. Payment Procurement by the State Costs of sampling and testing are normally borne by TxDOT; however, the costs of sampling and testing of materials failing to conform to the requirements of this specification shall be borne by the contractor or supplier. Costs of sampling and testing of failing materials shall be assessed at the rate established by the Director of CST/M&P in effect at the time of testing. Amounts due TxDOT for conducting such tests will be deducted from partial or final payments on direct purchases by the State. The contractor or supplier may be required to reimburse TxDOT for the cost of storage and/or handling of paint failing to meet specification requirements. Contracts For materials purchased on the open market by contractors, all costs of testing, whether performed directly by TxDOT or by commercial laboratories designated by TxDOT, will be charged to the Contractor and deducted from the amounts due him on monthly and final estimates. Finished Products When canned, the finished product shall be free from skins and foreign materials. Consistency, drying, and density (gallon weight) determinations on coatings are made at 25 C (77 F). Consistency is measured with a Krebs-Modified-Stormer Viscometer. Density shall be run according to ASTM D Viscosity shall be run in accordance with ASTM D 562. Containers shall be filled by weight based on the actual density (gallon weight) of the product at 25 C (77 F). TxDOT reserves the right to perform any and all testing which is necessary to establish conformance to the specification. Departmental Material Specifications 2 TxDOT 08/98 8/04

3 Containers and Markings Shipment shall be made in suitable, strong, well-sealed containers that meet specification and federal requirements and are sufficiently sturdy to withstand normal shipping and handling. Finished product containers and cases shall be plainly and securely labeled with: Manufacturer s Name Product Designation, including Component Part Batch Number Date of Manufacture Gross Weight. Labeling shall be on the sides of containers and cases and must be sufficiently moisture resistant to withstand outdoor storage for a minimum of one year. When the finished product is palletized for shipment, the labels shall be to the outside for easy identification. Paint Requirements All specified paints shall be purchased on the open market. (The Contractor is reminded that it is his responsibility to secure materials in sufficient time to allow for testing and timely execution of the work.) All paints shall meet the specific requirements for each type of paint as specified. Requirements set forth for paint, which is proprietary in nature, do not relieve the manufacturer of any obligations relating to patents, nor does it give the manufacturer the right to patent infringement. The chosen coating system shall be supplied from the same manufacturer and shall be recommended by the manufacturer as a system. In addition to meeting the requirements set forth in this specification, prospective suppliers of coatings which are proprietary in nature shall submit to the Director of CST/M&P, samples of the coatings for preliminary evaluation and a list of structures or jobs within the Texas coastal area on which the coatings have been used which documents satisfactory performance for a minimum of ten years. The Engineer reserves the right to inspect any or all sites listed by the supplier. In the event the Engineer deems inspection is necessary, the supplier shall secure permission from the owner for such an inspection to be made by TxDOT personnel. System III Inorganic Zinc Primer Departmental Material Specifications 3 TxDOT 08/98 8/04

4 System III Inorganic Zinc Primer shall be solvent-based inorganic zinc coating of the self-curing ethyl-silicate type. The coating shall be supplied as a two (2)-component system, one (1)-component consisting of the liquid or vehicle portion and the other consisting of the filler or powder portion. Both components shall be mixed before application to form the complete coating. The coating shall be packaged such that when one (1) can of vehicle and one (1) can of powder are mixed, the two (2) components will be mixed in the correct ratios. Liquid Component The density of the liquid component shall be within ± kilograms per liter (0.1 pound per gallon) of the material contained in the preliminary evaluation sample. When determined in accordance with "Tex-808-B, Determining Percent Solids in Alkyl Silicate Type Vehicles," the percent solids by weight of the clear vehicle shall be ± 0.7 of the percent value determined from the preliminary evaluation sample and the percent solids of the whole vehicle shall be ± 1.5 of the percent value determined from the preliminary evaluation sample. The liquid component shall be a solution of ethyl-silicate containing suspending agents, colorant pigments, and inert filler material. An infrared spectrum of the clear vehicle, obtained by centrifuging, shall match the infrared spectrum of the evaluation sample on file at CST/M&P. X-ray diffraction patterns of the clear and whole vehicle shall match the X-ray diffraction patterns on file at CST/M&P. A gas chromatographic analysis of the liquid portion of the coating shall match the chromatogram on file at CST/M&P. Powder Component The powder component shall contain ± kilograms per liter (0.2 pound per gallon) of the material contained in the preliminary evaluation sample. The powder component shall consist of essentially zinc dust at a minimum of 94.0 percent zinc metal. Iron oxide or zinc oxide may also be present in the powder component. The powder component shall be free of hard lumps or agglomerates of zinc dust. Mixed Coating When mixed in the correct proportion of vehicle to powder, the resulting material shall be of sprayable viscosity. Slight agitation shall keep the zinc dust properly suspended. Departmental Material Specifications 4 TxDOT 08/98 8/04

5 When the mixed coating is applied to blasted steel to achieve a 75- micrometer (three [3] mil) dry film, the coating shall be water insoluble within 15 minutes above 0 C (32 F) and within 30 minutes at 0 C (32 F). Atmospheric moisture or spray mist shall aid in achieving maximum film hardness. No alkali metal salts shall be formed in the curing process. A 75 to 100-micrometer (three [3] to four [4] mil) dry film applied to white metal blasted steel and cured for a minimum of 24 hours at 21 to 27 C (70 to 80 F) and 50 to 100 percent relative humidity shall withstand temperatures up to 315 C (600 F) with no film deterioration. The mixed coating shall have a minimum of 80.0 percent zinc metal in the dry film. Epoxy Zinc Primer The epoxy zinc primer shall be a polyamide-cured epoxy coating containing a minimum of 84.0 percent zinc metal in the dry film. This coating shall be supplied as a three-component system with a minimum volume solid of 43.6 percent. The base and catalyst portions shall contain ± kilogram per liter (0.1 pound per gallon) of the material contained in the preliminary evaluation sample. The percent solids by weight of both liquid components shall be ± 1.0 of the percent value determined from the preliminary evaluation sample. An infrared spectrum of the vehicle system(s), obtained by centrifuging, shall match the infrared spectrum of the evaluation sample on file at CST/M&P. The three components shall be mixed before application to form the complete coating. The coating shall be packaged such that when two (2) cans of vehicle and one (1) can of powder are mixed, the three (3) components will be mixed in the correct ratio. Epoxy Intermediate Coating The epoxy intermediate coating shall be a polyamide-cured and/or amine-cured epoxy containing inhibitive type pigments with a minimum volume solid of 46.8 percent. The base and catalyst portions shall contain ± kilogram per liter (0.1 pound per gallon) of the material contained in the preliminary evaluation sample. Departmental Material Specifications 5 TxDOT 08/98 8/04

6 The percent solids by weight of both liquid components shall be ± 1.0 of the percent value determined from the preliminary evaluation sample. An infrared spectrum of the vehicle system(s), obtained by centrifuging, shall match the infrared spectrum of the evaluation sample on file at CST/M&P. The two (2) components shall be mixed before application to form the complete coating. The coating shall be packaged such that when one (1) can of base and one (1) can of catalyst are mixed, the two (2) components will be mixed in the correct ratio. Urethane Appearance Coat The urethane appearance coat shall be an acrylic-cured aliphatic urethane gloss appearance coat recommended by the manufacturer for marine service. The cured film shall have a minimum 60-degree gloss of 85. Unless otherwise shown on the plans, the color of the urethane appearance coat shall be light gray to match the color of concrete. Epoxy Penetrating Sealer The penetrating sealer shall be a two-package, low-viscosity, epoxy coating. It shall be designed for wetting aged coatings and poorly prepared surfaces, and shall be essentially free of solvent. The base and catalyst portions shall contain ± kilogram per liter (0.1 pound per gallon) of the material contained in the preliminary evaluation sample. The percent solids by weight of the coating shall be ± 1.0 of the percent value determined from the preliminary evaluation sample. (These percent solids shall be determined on the mixed coating and dried for 24 hours in a silica gel desiccator.) An infrared spectrum of the systems shall match the infrared spectrum of the evaluation sample on file at CST/M&P. The two (2) components shall be mixed before application to form the complete coating. The coating shall be packaged such that when one (1) can of base and one (1) can of catalyst are mixed, the two (2) components shall be mixed in the correct ratio. Departmental Material Specifications 6 TxDOT 08/98 8/04

7 All coatings listed in the Paint Requirements section are not specified as high solids (volatile organic content-compliant) coatings. The manufacturer/supplier may prequalify a high solids version of all coatings providing the manufacturer/supplier can demonstrate that the high solids version is essentially the same coating as the prequalified lower solids coating(s). Coating Combinations Various combinations of these coatings shall be used on structural steel. Class A Blasted Steel Combination A Inorganic Zinc Primer (Shop Painting) Epoxy Zinc Primer (Field Touch-Up Painting) Epoxy Intermediate Coating Urethane Appearance Coating Combination B Epoxy Zinc Primer Epoxy Intermediate Coating Urethane Appearance Coating Combination C Epoxy Zinc Primer Urethane Appearance Coating. Class B Blasted Steel Combination A Epoxy Penetrating Sealer Epoxy Intermediate Coating Urethane Appearance Coating Combination B Epoxy Intermediate Coating Urethane Appearance Coating. Over Coating Epoxy Penetrating Sealer Epoxy Intermediate Coating Departmental Material Specifications 7 TxDOT 08/98 8/04

8 To be applied on hand-tool or power-tool cleaned areas without any old primer remaining or areas where the appearance coating was removed and the remaining primer is too thin Urethane Appearance Coating. Departmental Material Specifications 8 TxDOT 08/98 8/04