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ASTM D7553-15(R2021) pdf free download

ASTM D7553-15(R2021) pdf free download.Standard Test Method for Solubility of Asphalt Materials in N-Propyl Bromide
1. Scope
1.1 This test method covers the determination of the degree of solubility in n-propyl bromide of asphalt materials. It is intended to be a replacement for Test Method D2042 specify- ing a solvent that, like trichloroethylene, is safe in that it has no flash point, and has similar solubilizing characteristics to trichloroethylene, but it is not considered to be an ozone depleter banned by the Kyoto Protocol. N OTE 1—This method is not applicable to tars and their distillation residues or highly cracked petroleum products. For methods covering tars, pitches, and other highly cracked petroleum products, and the use of other solvents, see Test Methods D4, D2318, and D2764. 1.2 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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 of regulatory limitations prior to use. Specific precaution statements are given in Section 7. 1.5 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.
3. Summary of Test Method
3.1 The sample is dissolved in n-propyl bromide and filtered through a glass fiber pad. The insoluble material is washed, dried, and weighed.
4. Significance and Use
4.1 This test method is a measure ofthe solubility ofasphalt in n-propyl bromide. The portion that is soluble in n-propyl bromide represents the active cementing constituents. N OTE 2—The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, etc. Users of this standard are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results.
10. Procedure
10.1 Note safety precautions in Section 7. Transfer approxi- mately 2 g of the sample into a tared 125-mL Erlenmeyer flask or other suitable container. Smaller sample sizes may be necessary if more than 0.5 % insoluble material is expected. Allow the sample to cool to ambient temperature and then determine the mass to the nearest 1 mg. Designate this mass as B. Add 100 mL of the n-propyl bromide to the container in small portions with continuous agitation until all lumps disap- pear and no undissolved sample adheres to the container. Stopper the flask or otherwise cover the container and set aside for at least 15 min (see Section 9). 10.2 Place the previously prepared and weighed crucible in the filtering tube. Wet the filter pad with a small portion of n-propyl bromide and decant the solution through the filter pad of the crucible with or without light suction as may be necessary. When the insoluble matter is appreciable, retain as much of it as possible in the container until the solution has drained through the mat. Wash the container with a small amount of solvent and, using a stream of solvent from a wash bottle, transfer all insoluble matter to the crucible. Use a “policeman” if necessary to remove any insoluble matter adhering to the container. Rinse the policeman and container thoroughly. Wash the insoluble matter in the crucible with solvent until the filtrate is substantially colorless, and then apply strong suction to remove the remaining solvent. Remove the crucible from the tube, wash the bottom free of any dissolved matter, and place the crucible on top ofan oven or on a steam bath until all odor of the n-propyl bromide is removed (see safety precautions in Section 7). Place the crucible in an oven at 110 6 5 °C for at least 20 min. Cool the crucible in a desiccator for 30 6 5 min and determine its mass to the nearest 0.1 mg. Repeat the drying and weighing until constant mass (60.3 mg) is obtained. Designate this mass as C.

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