julia sultana

Weight Meter at Pycnometer

• to

Water bath
•Thermometers
•Distilled water.

Preparation of Apparatus:
• Partially fill a 600-mL or larger Griffin low-form beaker with freshly boiled and cooled distilled or deionized water to a level that will allow the top of the pycnometer to be immersed to a depth of not less than 40 mm.
•Partially immerse the beaker in the water bath to a depth sufficient to allow the bottom of the beaker to be immersed to a depth of not less than 100 mm, while the top of the beaker is above the water level of the bath. Utilize some method to ensure that the beaker does not tip over, while making sure that circulation of the water in the conditioning bath around the beaker is not restricted.
•Maintain the temperature of the water bath within 0.1°C (0.2°F) of the test temperature.

Calibration of Pycnometer:
•Thoroughly clean, dry, and weigh the pycnometer to the nearest 0.001 g. Designate this mass as A.
•Remove the beaker from the water bath if necessary. Fill the pycnometer with freshly boiled distilled or deionized water, placing the stopper loosely in the pycnometer. Place the pycnometer in the beaker and press the stopper firmly in place. Return the beaker to the water bath if previously removed.
•Allow the pycnometer to remain in the water for a period of not less than 30 min. Remove the pycnometer, immediately dry the top of the stopper with one stroke of a dry towel (Note 4), then quickly dry the remaining outside area of the pycnometer and weigh to the nearest 0.001 g. Designate the mass of the pycnometer plus water as B.


The Objectives of this experiment is to determine specific gravity of bitumen.

Procedure:
•At first we heat the bitumen materials with care to make it sufficiently fluid to pour and no air bubbles.

•After that we weighted the empty pycnometer using Weight meter and keep the data as A.

•Then we filled the pycnometer to its lined height with distilled, boiled and cooled water. Get weight it again and keep this data as B.|

•We removed the water from pycnometer and put the sample bitumen (The matrial should not touch the side of pycnometer).

•Now we weighted the pycnometer with bitumen and kept the data as C.

•Again we filled the pycnometer with water as step 3 but this time bitumen materials stayed in it. Again we weighted it and kept data as D.

•We do all this step three times and keep all the data for calculation.
Name: Shabana Akhter ID No: 20161003041

• to

Weight of pycnometer, A = 22.277gm
Weight of pycnometer + water, B = 74.151gm
Weight of pycnometer + bitumen, C = 55.445gm
Weight of pycnometer + water + bitumen, D = 74.628gm


= 1.015

RESULTS: The specific gravity of bitumen is 1.015 at 25/25°C
DISCUSSION: This experiment has been performed successfully and the specific gravity of bituminous material is 1.014 which is in the range of 0.97 to 1.02 (allowable limit). So it is acceptable.
We careful about all the error which may be vary our results. There were no bubbles in the pycnometer and no bitumen loss so chance of error was eliminated and thus the value is correct.

Question to be solved:
•Define Specific Gravity.
•Why Heating is done?
•Write down the allowable limit of Specific Gravity
•What are the basic use of the test.
Solution:
•Specific Gravity: The specific gravity is ratio of the weight of a given volume of the material at 25°C and equal volume of the water at the same temperature.

Specific Gravity =

•Heating is done because:
•To remove air bubbles.
•To pour it into pycnometer.
•To change the volume.

•The allowable limit of Specific Gravity is 0.97-1.02 at 25/25°C

•The basic use of this test is convert volume to weight and weight to volume of bituminous materials using specific gravity.