In a collapse slump the concrete collapses completely. The slumped concrete takes various shapes, and according to the profile of slumped concrete, the slump is termed as In order to reduce the influence on slump of the variation in the surface friction, the inside of the mould and its base should be moistened at the beginning of every test, and prior to lifting of the mould the area immediately around the base of the cone should be cleaned from concrete which may have dropped accidentally. (usually measured to the nearest 5 mm (1/4 in).
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