ASTM D6997-12(R2020) pdf free download

ASTM D6997-12(R2020) pdf free download.Standard Test Method for Distillation of Emulsified Asphalt
1. Scope
1.1 This test method covers the quantitative determination of residue and oil distillate in emulsified asphalts composed principally of a semisolid or liquid asphaltic base, water, and an emulsifying agent. 1.2 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Significance and Use
4.1 This test method can be used for quantitative determi- nation of residue and oil distillates in emulsified asphalts for specification acceptance, service evaluation, control, and re- search. This test method can also be used to obtain residue and oil distillate for further testing. This method may not be appropriate for emulsified asphalts containing latex or poly- mer; however, some specifying agencies may utilize this method and stipulate a lowered distillation temperature. By stipulating a lowered distillation temperature, the precision and bias statement may not be considered valid. Low-temperature methods such as Test Method D7403 and Practice D7497 are options for obtaining residue for latex or polymer modified emulsified asphalts.
5. Apparatus
5.1 Aluminum-Alloy Still—Approximately 241 mm in height by 95 mm inside diameter with cover and clamp as shown in Fig. 1. The dimensions as noted in Fig. 1 are provided as reference for the ease of the user and are considered noncritical dimensions. N OTE 1—Residue by distillation results obtained with iron stills are acceptable. 5.2 Gasket—A variety of gasket materials may be used to seal the still providing they withstand the maximum tempera- ture reached during distillation. N OTE 2—Use of a gasket is optional if the joint can be ground to a tight fit or only residue recovery is required and further analysis on the water or oil distillate is not needed. 5.3 Heat Sources—Having holes on the inner periphery and having three spacers, to ensure centering of burner around the still (see Fig. 2). The dimensions as noted in Fig. 2 are provided for reference for the ease of the user and are considered noncritical dimensions. N OTE 3—Optional use ofa bunsen burner (equipped with optional wing tip) as shown in Fig. 3. 5.4 Connection Apparatus—Consisting of approximately 12 mm glass or metal connecting tube, tin shield (as detailed in Fig. 3), and a water-cooled glass condenser tube with a metal or borosilicate glass jacket. The metal connecting tube may be secured to the lid by a threaded compressing fitting. Glass connecting tube may be secured to the lid by means of a cork or silicone stopper. Other condensers of approximately 12 mm glass or metal tubing may be used, providing that the wetted length is 400 to 550 mm. The dimensions as noted in Fig. 3 are provided for reference for the ease of the user and are considered noncritical dimensions. 5.5 Graduated Cylinder—100 mL, with graduation intervals of 1.0 mL. 5.6 Thermometer—ASTM 7C thermometer, as prescribed in Specification E1, or any other thermometric device of equal accuracy. 5.7 Balance—Capable ofweighing 3500 g to within 60.1 g. 5.8 Stoppers—Cork (wrapped in foil) or silicone stoppers to seal holes in still cover, maintain temperature measuring device position, and secure connecting tube to still cover. 5.9 Rubber Tubing—Heat-resistant tubing of adequate size to secure glass to glass joint of connecting tube and condenser. 5.10 Sieve—300 µm sieve to capture foreign materials when suspected. N OTE 4—For details of the assembly of apparatus for the distillation test, see Fig. 3.
6. Sample Conditioning for Testing
6.1 All emulsified asphalts shall be properly stirred to achieve homogeneity before testing. 6.2 All emulsified asphalts with viscosity testing require- ments of 50 °C shall be heated to 50 6 3 °C in the original sample container in a water bath or oven. The container should be vented to relieve pressure. After the sample reaches 50 6 3 °C, stir the sample to achieve homogeneity. 6.3 Emulsified asphalts with viscosity testing requirements of 25 °C shall be conditioned to 25 6 3 °C in the original sample container to achieve homogeneity. After the sample reaches 25 6 3 °C, stir the sample to achieve homogeneity. N OTE 5—Emulsified asphalts with viscosity testing requirements of 25 °C may be heated and stirred as specified in 6.2, if necessary.