1、Standard Method of Test for Bulk Specific Gravity (Gmb) of Compacted Bituminous Mixtures Using Water Displacement Measured by Pressure Sensor AASHTO Designation: TP 82-10 (2016)1 Release: Group 3 (August 2016) American Association of State Highway and Transportation Officials 444 North Capitol Stree
2、t N.W., Suite 249 Washington, D.C. 20001 TS-2c TP 82-1 AASHTO Standard Method of Test for Bulk Specific Gravity (Gmb) of Compacted Bituminous Mixtures Using Water Displacement Measured by Pressure Sensor AASHTO Designation: TP 82-10 (2016)1Release: Group 3 (August 2016) 1. SCOPE 1.1. This test metho
3、d covers the determination of bulk specific gravity (Gmb) of compacted bituminous mixtures. 1.2. This method can be used with samples that contain open or interconnecting voids or absorb more than 2.0 percent of water by volume, or both (Note 1). Note 1Water absorption by volume is determined using
4、T 166; this specification does not contain a direct determination of the water absorption by volume. 1.3. The bulk specific gravity of compacted bituminous mixtures may be used in calculating the unit mass of the mixture. 1.4. The values stated in SI units are to be regarded as the standard. Unit eq
5、uivalencies are included for reference and informational purposes only. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 231, Weighing Devices Used in the Testing of Materials T 166, Bulk Specific Gravity (Gmb) of Compacted Hot Mix Asphalt (HMA) Using Saturated Surface-Dry Specimens T 245, Resistanc
6、e to Plastic Flow of Asphalt Mixtures Using Marshall Apparatus T 312, Preparing and Determining the Density of Asphalt Mixture Specimens by Means of the Superpave Gyratory Compactor 2.2. ASTM Standard: D5581, Standard Test Method for Resistance to Plastic Flow of Bituminous Mixtures Using Marshall A
7、pparatus (6 inch-Diameter Specimen) 3. TERMINOLOGY 3.1. Definitions: 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2c TP 82-2 AASHTO 3.1.1. bulk specific gravity (Gmb) (of solids)the ratio of the we
8、ight in air of a unit volume of a permeable material (including both permeable and impermeable voids normal to the material) at a stated temperature to the weight in air of equal density of an equal volume of gas-free distilled water at a stated temperature. 3.1.2. constant massthe mass at which fur
9、ther drying at 52 3C (125 5F) does not alter the mass by more than 0.05 percent when weighed at 2-h intervals. 4. TEST SPECIMENS 4.1. Test specimens may be either laboratory-compacted asphalt mixtures or cylindrical cores sampled from asphalt pavements. 4.2. Size of SpecimensIt is recommended that:
10、(1) the diameter of cylindrically compacted or cored specimens shall be at least equal to four times the maximum size of the aggregate; and (2) the thickness of specimens be at least one and one-half times the maximum size of the aggregate. 4.3. Specimens shall be (1) compacted in accordance with T
11、245, T 312, or ASTM D5581, or (2) taken from asphalt pavements with a core drill, diamond or carborundum saw, or by other suitable means. Care shall be taken to avoid distortion or cracking of specimens during and after removal from the mold or pavement. Specimens shall be stored in a cool, safe pla
12、ce. 4.4. Specimens shall be free from foreign materials such as seal coat, tack coat, foundation material, soil, paper, or foil. 4.5. If desired, specimens may be separated from other pavement layers by sawing or other suitable means. Care should be exercised to ensure separation does not damage the
13、 specimens. 5. APPARATUS 5.1. Weighing DeviceThe weighing device shall have sufficient capacity, be readable to 0.1 percent of the sample mass or better, and conform to the requirements of M 231. 5.2. Water Displacement Measurement ApparatusThe water displacement measurement apparatus shall be of su
14、fficient size to accept a 100-mm (4-in.) or 150-mm (6-in.) diameter laboratory-molded or field-cored specimen. It shall have depth adequate to immerse the bituminous specimen throughout its height. The water displacement measurement apparatus must be capable of calculating and displaying the bulk sp
15、ecific gravity based on the displaced water volume and the dry mass of the asphalt sample within 30 s to avoid the influence of absorbed water during the rapid measurement of displacement. 6. STANDARDIZATION 6.1. The water displacement measurement apparatus requires periodic verification. The unit s
16、hould be verified once each day before bulk specific gravity measurements are taken. Refer to the manufacturers recommendations for the verification procedure. 7. PROCEDURE 7.1. Dry the asphalt specimen to a constant mass. Specimens exposed to moisture shall initially be dried overnight in an oven a
17、t 52 3C (125 5F) (Note 2). Allow the specimen to cool to room temperature, 25 5C (77 9F). Weigh and record the dry mass of the specimen to the nearest 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2
18、c TP 82-3 AASHTO 0.1 g. Allow the unit to initialize with the appropriate 100-mm (4-in.) or 150-mm (6-in.) sample holder in the chamber. After initialization, enter the dry mass of the asphalt specimen to the nearest 0.1 g on the keypad, and slide the sample holder out of the water. Place the specim
19、en between the holders rails, and slowly immerse the specimen into the chamber. Note 2Recently molded laboratory samples that have not been exposed to moisture do not require drying. 7.2. Record the bulk specific gravity displayed on the screen of the measurement device, or export the sample data to
20、 a printer or computer. 8. REPORT 8.1. The report shall include the following: 8.1.1. Bulk specific gravity reported to the nearest 0.001. 9. PRECISION 9.1. Research to develop estimates for the precision of this bulk specific gravity measurement has not been completed. 1This provisional standard was first published in 2010. 2016 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.
