1、Standard Specification for Field-Applied Coating of Corrugated Metal Structural Plate for Pipe, Pipe-Arches, and Arches AASHTO Designation: M 243-96 (2012) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS-4b M 243-1
2、AASHTO Standard Specification for Field-Applied Coating of Corrugated Metal Structural Plate for Pipe, Pipe-Arches, and Arches AASHTO Designation: M 243-96 (2012) 1. SCOPE 1.1. This specification covers field-applied asphaltic mastic coating of corrugated metal structural plate for pipe, pipe-arches
3、, and arches to be used for the construction of metal culverts. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 167M/M 167, Corrugated Steel Structural Plate, Zinc-Coated, for Field-Bolted Pipe, Pipe-Arches, and Arches M 219, Corrugated Aluminum Alloy Structural Plate for Field-Bolted Pipe, Pipe-Ar
4、ches, and Arches 3. DESCRIPTION 3.1. Corrugated metal structural plate for pipe, pipe-arches, and arches shall conform to the requirements of M 167M/M 167 or M 219 and, in addition, shall be coated as hereinafter described. 3.2. Before applying coating material to metal surfaces, moisture, dirt, oil
5、, unbonded or incompatible paint, grease, residual oils, alkalies, or other foreign matter must be removed from the surface to be coated. COATING MATERIAL REQUIREMENTS 4. ASPHALT MASTIC 4.1. The material shall be uniformly applied to structural plate for pipe, pipe-arches, or arches in such a manner
6、 as to attain (both inside and outside) a minimum thickness of 1.27 mm measured on the crest of the corrugations. 4.2. The asphalt mastic shall be furnished in any one of three consistencies depending on the type of application to be employed. In spraying consistency, the material shall be suitable
7、for air gun spraying without the use of additional thinners at temperatures of 4.4C and above. In trowel grade consistency, the material shall be suitable for knife or trowel application. In brushing consistency, the material shall be suitable for application with an ordinary roofing brush. 2015 by
8、the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4b M 243-2 AASHTO 4.3. The asphalt mastic shall be designed as a cold-applied membrane waterproofing for application to aluminum or steel to provide a protectiv
9、e coating with high resistance to corrosion and chemical fumes. It shall not be affected by freezing temperatures and will not flow in hot weather. It shall have high cohesive strength and, after application, readily harden into a tough elastic seal. The material shall be mixed until the mineral sta
10、bilizers and fillers are uniformly dispersed. 4.4. The material for coating shall be an asphalt having the following physical characteristics: Asphalt BaseOxidized petroleum asphalts SolventRapid drying petroleum solvents FillersMineral stabilizers and fillers ConsistencyMade in three consistenciest
11、rowel, brush, and spraying 4.5. Physical Properties: Trowel Grade Spraying Grade Brushing Grade Min Max Min Max Min Max Solids, % by mass 63 68 61 66 60 65 Density, kg/L 1.04 1.07 0.99 1.11 0.98 1.02 Dry to touch, h 2 2 2 Dry hard 48 48 48 4.6. Methods of Sampling and Testing: 4.6.1. A representativ
12、e sample of approximately 4 L shall be taken from each lot furnished. 4.6.2. Physical Tests: 4.6.2.1. Solids ContentApproximately a 9-g sample of material is weighed into an aluminum drying dish to an accuracy of 0.01 g. Sample is heated until constant mass is obtained (approximately 24 to 48 h) at
13、163 3C, cooled, reweighed, and percentage of solids calculated. Percent of solids is determined by dividing mass of material after heating by mass of material before heating 100. 4.6.2.2. Flow Properties at Elevated TemperaturesA coating of the material is applied approximately 1.6 mm thick, on a de
14、greased steel panel 0.61 mm thick. Parallel lines spaced 12.7 mm apart are scored horizontally across the width of the surface. After air drying for a period of 48 h, the panel shall be suspended in a vertical position in an oven at 66 3C for 24 h. After removal of the panel, the surface of the coat
15、ing is inspected for shifting or sagging of the lines. Any shifting or sagging of the lines shall be cause for rejection. 4.6.2.3. Acid and Alkali ResistanceA coating of the material prepared in accordance with Section 4.6.2.2 shall show no signs of attack when immersed for 24 h in each of the follo
16、wing solutions: 10 percent of hydrochloric acid, 10 percent of sulfuric acid, and 10 percent of sodium hydroxide. On removal of the mastic by solvent cleaning, the panel surface shall be free from any pitting or rusting. 4.6.2.4. Pliability and Adherence CharacteristicsA coating of the material shal
17、l be prepared in accordance with Section 4.6.2.2. After air drying for a period of 48 h, followed by baking in an oven for 48 h at 104 3C, the material shall not crack or peel from the panel when bent at room temperature (22 1C) 180 degrees over a 28.6-mm mandrel. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.
