STEP  1 

Objective:

determine the angularity number of aggregate.

Appratus used:

BS test sieves: 20.0 mm, 14.00 mm, 10.00 mm, 6.30 mm, 5.0 mm, a balance of capacity 10kg and accurate to 1, a metal cylinder(150mm * 150mm)

STEP  2   Keep the metal cylinder on the weighing balance, then TARE the balance. 

STEP  3   Fill the cylinder with water. 

STEP  4   Record the volume of water filled inside the metal cylinder. 

STEP  5   Place the tray on the balance and TARE the balance. 

STEP  6   Take sufficient quantity of aggregate in the tray and weigh them. 

STEP  7   Arrange the sieves in descending order, with the largest aperture size at the top and the smallest one at the bottom and place a pan below the lower most sieve. 

STEP  8   Now, put the weighed aggregates on the sieve stack. 

STEP  9   Cover the sieve stack with the lid and place it on the sieve shaker. Start the sieve shaker, and after some time, remove the sieves and record the aggregates collected in each sieve. 

STEP  10   Fill the aggregate in the metal cylinder in three layers. Compact each layer uniformly by giving 100 blows using a tamping rod and then remove off the excess aggregate with the tamping rod. 

STEP  11   Weigh the aggregates with the cylinder. 

STEP  12   Make three separate descriptions and determine the average weight of aggregates in the cylinder.