Answer: Place the slump cone on an iron plate, fill it with concrete mixture and tamp it, then lift the slump cone vertically, and the concrete specimen will collapse downward. The distance between the top of the cone and the highest point of the specimen is the slump. The slump of ordinary concrete is 30 to 90 mm. The slump of pumped concrete is 100 to 230 mm. The higher the pumping height, the greater the slump, and vice versa.
