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The apparatus of the aggregate impact value test consists of: A testing machine weighing 45 to 60 kg and having a metal base with a plane lower surface of not less than 30 cm in diameter. Level and plane concrete floor of minimum 45 cm thickness are used to support it. The base of 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 weighting 13.5 to 14.0 kg the lower end is cylindrical in shape, is 50 mm long, 100.0 mm in diameter, with a 2 mm chamfer at the lower edge and case hardened. The hammer is arranged in such a way that it should slide freely between vertical guides and be concentric with the cup. It is arranged that the free fall of the hammer should be within 380±5 mm. A cylindrical metal measure having an internal diameter of 75 mm and depth 50 mm for measuring aggregates. One end rounded tamping rod 10 mm in diameter and 230 mm long. A balance of capacity not less than 500 g, and readable and accurate up to 0.1 g.