The consistency of concrete is measured by the slump test. Thetest should not take longer than 10 minutes because concrete loses its slumpover time. A metal slump cone mould, steel rod and ruler are used to measurethe slump. The slump cone mould is 300 mm high, 200 mm wide at the basediameter, and 100 mm wide at the top diameter; and the hemispherically shapedtipped steel rod is 16 mm wide (diameter) and 600 mm long. The ruler is metricor imperial. The slump cone mould isfilled with 3 equal layers of concrete after it has been dampened and placed ona solid flat surface. Each layer is rodded 25 times before the next layer isplaced. After rodding, the first layer will be 70 mm in depth, the second layerwill be 160 mm, and the third layer will be filled to overflowing. The lastlayer is struck off and the slump cone mould is removed slowly and upright.After the concrete settles to a new height, the empty slump cone mould isplaced next to the concrete. The slump is measured,with an accuracy of 10 mm,from the slump cone mould top to the top of the settled concrete. Fluidconcrete has a high slump and stiff concrete has a low slump.
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