Our Aggregate Impact Value apparatus is meticulously designed to provide precise and dependable results when assessing the impact resistance of aggregates. It simulates the impact of a standard hammer on an aggregate sample, measuring its ability to withstand sudden shocks, a crucial factor in various construction applications. Constructed using premium materials and advanced manufacturing techniques, this equipment ensures durability and longevity of aggregate impact value tester manufacturers and suppliers in Bihar, Jharkhand, West Bengal, Kolkata, Ranchi, Patna.

The apparatus as per IS 2386 (Part IV) of 1963 consists of:

• A testing machine weighing 45 to 60 kg and having a metal base with a painted lower surface of not less than 30 cm in diameter It is supported on a level and flat concrete floor of a minimum 45 cm thickness. The machine should also have provisions for fixing its base.
• A cylindrical steel cup of internal diameter 102 mm, depth 50 mm, and minimum thickness 6.3 mm
• A metal hammer or tup weighing 13.5 to 14.0 kg, the lower end being cylindrical in shape, 50 mm long, 100.0 mm in diameter, with a 2 mm chamfer at the lower edge and case hardened The hammer should slide freely between vertical guides and be concentric with the cup. The free fall of the hammer should be within 380±5 mm.
• A cylindrical metal measure having an internal diameter of 75 mm and a depth of 50 mm is used for measuring aggregates.
• The tamping rod is 10 mm in diameter and 230 mm long, rounded at one end. (vi) A balance of capacity not less than 500g, readable and accurate up to 0.1 g.

Procedure for the Aggregate Impact Value Tester

The test sample consists of aggregates sized 10.0 mm by 12.5 mm. Aggregates may be dried by heating at 100–110 ° C for a period of 4 hours and cooled

• Sieve the material through 12.5 mm and 10.0mm IS sieves. The aggregates passing through a 12.5-mm sieve and retained on a 10.0-mm sieve comprise the test material.
• Pour the aggregates to fill about 1/3 the depth of the measuring cylinder.
• Compact the material by giving 25 gentle blows with the rounded end of the tamping rod.
• Add two more layers in a similar manner so that the cylinder is full. (v) Strike off the surplus aggregates.
• Determine the net weight of the aggregates to the nearest gramme (W).
• Bring the impact machine to rest without wedging or packing up on the level plate, block, or floor, so that it is rigid and the hammer guide columns are vertical.
• Fix the cup firmly in position on the base of the machine, place the whole test sample in it, and compact by giving 25 gentle strokes with the tamping rod.
• Raise the hammer until its lower face is 380 mm above the surface of the aggregate sample in the cup, and allow it to fall freely on the aggregate sample. Give 15 such blows at an interval of not less than one second between successive falls.
• Remove the crushed aggregate from the cup and sieve it through 2.36 mm IS sieves until no further significant amount passes in one minute. Weigh the fraction passing the sieve to an accuracy of 1 g. Also, weigh the fraction retained in the sieve. Compute the aggregate impact value. The mean of two observations, rounded to the nearest whole number, is reported as the aggregate impact value tester manufacturers and suppliers in Bihar, Jharkhand, West Bengal, Kolkata, Ranchi, Patna.

Classification of aggregates using Aggregate Impact Value is as given below: