Although it is often seen that the tank body of the concrete mixer truck always turns when driving, many people have different views on this, and many people think that the reason is very simple. The concrete just out of the mixing plant is the initial material. After just out of the mixing plant, simple batching and mixing are carried out. In order to ensure the uniformity of concrete, secondary mixing is required on the concrete mixer.
Generally, the mixing tank car needs to guarantee the speed of 10-30 revolutions, which may be lower in summer. It only needs to protect the concrete isolation from occurrence and initial setting. Too frequent and exciting may lead to too much water evaporation and poor workability of concrete unloading, affecting the placement of components of concrete quality, which is reflected in quality defects such as honeycomb, pitted surface and steel leakage.
The secondary mixing in the transportation process of concrete mixer truck belongs to deep processing, but not simple rotation. Too slow, the coarse aggregate in the concrete is easy to sink, too fast, which has a certain impact on the safety of the driver, but also increases the water loss of the concrete, the slump increases, and affects the flow; when the rotation speed is 6-8 / min, the initial setting time of the concrete is generally 3-6 hours. Short traffic jams have little effect on the concrete. If the traffic jam time is too long, the rotation times of the concrete tank shall be appropriately accelerated for 1-2 cycles, and attention shall be paid to whether the rotation of the tank is abnormal. When appropriate, water can be added to maintain the workability of concrete and avoid concrete adhesion.
It shortens the initial setting time of concrete and improves the physical properties of concrete.