Bulk Specific Gravity Procedures

This video tutorial demonstrates the procedure for determining the bulk specific gravity of a specimen using the saturated surface dry (SSD) method, following AASHTO T 166 standards. It covers necessary equipment, specimen preparation, submersion, and measurement techniques, and explains how to achieve the SSD condition and calculate the bulk specific gravity.

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

• Wet method

• Saturated Surface Dry (SSD) method

• Dry method

• Vacuum method

Which safety equipment is recommended during the procedure?

• Ear plugs

• Lab coat

• Safety glasses

• Gloves

What is the required readability of the balance used in the procedure?

• 0.5% of the specimen mass

• 0.1% of the specimen mass

• 0.01% of the specimen mass

• 1% of the specimen mass

At what temperature should the water bath be maintained?

• 20 ± 1 degrees Celsius

• 25 ± 1 degrees Celsius

• 30 ± 1 degrees Celsius

• 35 ± 1 degrees Celsius

What is the drying temperature for the specimen in an oven?

• 50 ± 3 degrees Celsius

• 52 ± 3 degrees Celsius

• 56 ± 3 degrees Celsius

• 54 ± 3 degrees Celsius

How long should the specimen be conditioned undisturbed in the water bath?

• 1-2 minutes

• 3-5 minutes

• 7-10 minutes

• 5-7 minutes

What is the purpose of tapping the specimen in the water bath?

• To dry the specimen

• To clean the specimen

• To remove entrapped air bubbles

• To cool the specimen

What is the first step in achieving a saturated surface dry condition?

• Apply water to a dry towel

• Weigh the specimen

• Place the specimen in an oven

• Immerse the specimen in water

How is the bulk specific gravity of the specimen calculated?

• By dividing the dry specimen mass by the difference between the SSD mass and the mass in water

• By dividing the mass of the specimen in water by the dry specimen mass

• By dividing the SSD mass by the dry specimen mass

• By dividing the dry specimen mass by the mass of the specimen in water

What is the final step in the procedure for determining bulk specific gravity?

• Dry the specimen

• Calculate the bulk specific gravity

• Immerse the specimen in water

• Condition the specimen