First, ensure that there is no segregation, because in today's situation of mass production of large slump concrete, if the drum does not mix, the consequence is that your mixer will spend about 20000 to replace the transmission shaft of the reducer, because in the case of bumpy transportation, the sand and gravel will settle on the drum, and the water will float on the top, which is called segregation, Then you go to the construction site and want to put the material. Suddenly you find that the drum can't rotate, it can only rotate 1 / 4 circle, and then the whole car turns to one side as if it's going to turn over, because the weight is concentrated on one side, and then it either overturns or the transmission shaft is broken（ PS: the rotation of mixer drum consumes more fuel, so some cars will not rotate secretly. The old company will rotate several times every 10 minutes, and the novice will not rotate until they know it. Then it's a tragedy. Of course, our company uses Foxconn's monitoring system, and there will be monitoring if the drum doesn't rotate.)
The second is slump preservation, because according to the experiment, the slump difference between concrete without mixing and mixing during transportation is about 20 mm to 40 mm per hour. One of the most important aspects of concrete is slump, which directly affects the constructability and engineering quality.
Third, there is part of the mixing function, but this mixing function must have a certain effect in the case of rapid rotation of the drum, but the mixing effect is not obvious at the speed of several revolutions per minute on the road. After all, the blades in the drum are spiral, not the mixing knife.
Or to prevent solidification. Generally speaking, the initial setting time is about 45 minutes, that is to say, the quality is affected by solidification. Therefore, it is necessary to rotate continuously during transportation to prevent this. Of course, if the distance is very long, some retarders may be added to further prevent solidification.
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