Bulk Specific Gravity Measurement Procedures

This video tutorial demonstrates the procedure for determining the bulk specific gravity of small specimens using the vacuum sealing method, following AASHTO T 331 with modifications. It covers necessary equipment, specimen preparation, sealing, immersion, and final measurements. Safety recommendations and calculation methods are also discussed.

What is the primary method discussed in the video for determining the bulk specific gravity of small specimens?

• Direct weighing method

• Gas pycnometry method

• Water displacement method

• Vacuum sealing method

Which of the following is recommended for safety when conducting bulk specific gravity measurements?

• Using ear protection

• Wearing gloves

• Using a face mask

• Wearing safety glasses

What is the required readability of the balance used in the vacuum sealing method?

• 10% of the specimen mass

• 1% of the specimen mass

• 0.01% of the specimen mass

• 0.1% of the specimen mass

What is the standard size of vacuum bags for small specimens?

• 10 by 7 inches

• 7 by 10 inches

• 10 by 14 inches

• 14 by 10 inches

How should the rubber strips be positioned when placing the sliding plate on the filler plate?

• Facing down

• Facing up

• At the sides

• In the middle

What should be done if unsure of how to seal the bag?

• Consult the equipment manufacturer

• Guess the sealing method

• Use a different bag

• Skip the sealing step

At what temperature should the specimen be conditioned in an oven?

• 25 plus or minus 1 degrees Celsius

• 52 plus or minus 3 degrees Celsius

• 100 plus or minus 5 degrees Celsius

• 75 plus or minus 2 degrees Celsius

What should be done if the reweighed specimen mass exceeds the limit shown in the table?

• Repeat the procedure

• Ignore the result

• Proceed with the calculation

• Use a different method

What is the purpose of the bag correction factor in the calculation of bulk specific gravity?

• To adjust for temperature variations

• To compensate for water density

• To account for bag weight differences

• To correct for air pressure changes

What is the correct procedure if the bag and specimen touch the sides of the water bath?

• Continue with the measurement

• Remove and reposition the bag

• Add more water to the bath

• Ignore the contact