Fresh concrete is generally considered no-slump if it has a slump less than 2 cm and a VeBe time longer than 5 sec. approx. Therefore it consists of a stiff mass that has to be compacted by means of pressure combined with vibration, rolling and/or extrusion, generally a shear movement in order to grant a good interlocking between the aggregate particles. Gyratory Testing Machine well reproduce in laboratory the compaction of noslump concrete by mean of vertical pressure combined with the gyratory movement.
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