![]() Dry and weigh using the same technique and timing as that employed in # 2. Allow the Pycnometer to remain in the water bath for a period of not less than 30 minutes. Place the Pycnometer in the beaker and press the stopper firmly in place. Do not allow any air bubbles to remain in the Pycnometer. Fill the Pycnometer containing the asphalt with freshly boiled distilled water, placing the stopper loosely in the Pycnometer. Designate the mass of the Pycnometer plus sample as ‘C’.ĥ- Remove the beaker from the water bath. Allow the Pycnometer and its contents to cool to ambient temperature for a period of not less than 40 minutes, and weigh with, the stopper to the nearest 1 mg. Take precautions to keep the material from touching the sides of the Pycnometer above the final level, and to prevent the inclusion of air bubbles. Meter to fill it about three-fourths of its capacity. Designate the mass of the Pycnometer plus water as ‘B’.Ĥ- Pour enough sample into the clean, dry, warmed Pycno Remove the Pycnometer, immediately dry the top of the stopper with one stroke of a dry towel, then quickly dry the remaining outside area of the Pycnometer and weigh to the nearest 1 mg. Return the beaker to the water bath, and allow the Pycnometer to remaining the water bath for a period of not less than 30 minutes. Designate this mass as ‘A’.ģ- Then fill the beaker with freshly boiled distilled water, placing the stopper loosely in the Pycnometer. Ii)- Do not heat for more than 30 minutes over a flame or hot plate or for more than 2 hours in an oven, and avoid incorporating air bubbles in the sample.Ģ- Thoroughly clean, dry, and weigh the Pycnometer to the nearest 1 mg. I)- In no case should the temperature be raised to more than 56 ☌ above the expected softening point for tar, or to more than 111☌ above the expected softening point for asphalt. While heating, keep in mind the following considerations ![]() Distilled water - freshly boiled and cooled distilled water shall he used to fill the Pycnometer and the beakerġ- Heat the sample with care, stirring to prevent local overheating until the sample has become sufficiently fluid to pour.Balance - a balance conforming to the requirements of AASHTO.Thermometers - calibrated liquid-in-glass, total immersion type, of suitable range.Water bath, constant-temperature, capable of maintaining the temperature within 0.1 ☌ of the test temperature.The stopper Pycnometer shall have a capacity of 24 to 30 ml, and shall weigh not more than 40 gram. The height of the concave section shall be 4.0 to 18.0 mm at the center. The top surface of the stopper shall be smooth and substantially plane and the lower surface shall be concave in order to allow all air to escape through the bore. The stopper shall be provided with a hole 1.0 to 2.0 mm in diameter, centrally located in reference to the vertical axis. Pycnometer - glass, consisting of a cylindrical or conical vessel carefully ground to receive an accurately fitting glass stopper 22 to 26 mm in diameter.Thus it is possible for a quantitative extraction of mineral impurity in bitumen. In case bitumen contains mineral impurities the specific gravity will be higher. ![]() Bitumen binder has specific gravity in the range of 0.97 to 1.02.Specific gravity is also used in identifying the source of bitumen binder.Bitumen weights sometimes have to be converted into volumes for asphalt concrete mix design calculations for which a knowledge of specific gravity is essential.Specific gravity of a bitumen binder is a fundamental property frequently required as an aid in classing binders for use in paving jobs.The specific gravity of semi-solid bituminous material, asphalt cements, and soft tar pitches shall be expressed as the ratio of the mass of a given volume of the material at 25 ☌ to that of an equal volume of water at the same temperature. SPECIFIC GRAVITY Specific Gravity of Bitumen 9 SPECIFIC GRAVITY TEST ON BITUMINOUS MATERIALS. Specific Gravity of Bitumen EXPERIMENT NO.
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