In the slump test, a pan is placed on the floor and it is moistened with a small amount of water to make sure that it is damp but no water is left in it. The sand being used is poured in to the pan and the cement and any admixes and aggregates are gradually added into the pan and mixed using a trowel until they are thoroughly mixed together. After that, while holding a slump cone in place, the cone is filled with the concrete mix and tamped repeatedly while making sure that the mix is not stirred. Usually the tamping is not done more than 30 times.
Then, more concrete mix is poured into the cone until two thirds of the cone has been filled and once again tamped but this time, the tamping is done relatively lightly. The cone is then filled to the top with the concrete mix and tamped around 30 times once again. Once the cone has been filled with this specific combination of mix, the cone is slowly lifted up vertically making sure that the now somewhat settled mix inside does not get disturbed. The concrete mix is then left and allowed to slump until it hardens (The Concrete Society, 2008). Once hardened, the hardened cone is inverted and the rod is placed on the cone to measure the distance from the rod to the original displaced center of the slumped mix. In other words, the distance that the concrete slumps from its initial location gives us the measure of the slump of the concrete batch.
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