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The Main Reason for Concrete Segregation in Mixer Truck

2020-01-03

Apart from the stuffy tank, the most troublesome in the use of concrete mixer trucks is also a headache. The larger the mixing tank, the easier it is to segregate? What is the reason for the separation? The main reason for the segregation is the technical problem of the mixing station, but improper use of the mixing truck will also cause the phenomenon of concrete segregation.

Concrete mixer station

What is the phenomenon of concrete segregation

Simply put, the main material mortar in the concrete is separated from the sand. A more professional explanation is that the cohesion between the components of the concrete mixture is not enough to resist the sinking of the coarse aggregate, and the components of the concrete mixture are separated from each other, resulting in uneven internal composition and structure.

Technical problems of mixing station are the main cause

Concrete segregation is mainly the technical problem of mixing concrete at the mixing station. There are strict specifications for the proportion of concrete at different levels. Improper use of water, cement, sand, and additives may cause concrete segregation. It is mainly caused by the following situations:

HOWO Concrete mixer truck

1. Improper water-to-material ratio. Adding more water and less cement will cause segregation.

2. The quality of the sand is not good. There are many stones in the sand, and excessive water content will also cause segregation.

3. Gravel grading is not good. Increasing crushed stone particle size, poor grading, and single grading all easily cause segregation of concrete.

4. Add excessive amount of admixture. Excessive admixtures such as retarders, or poor adaptability of admixtures to cement can also cause concrete segregation.

Don't ignore the reasons for using the mixer truck

Although the main reason for the segregation of concrete is the technical problem of the mixing station, improper transportation and use of the mixing truck may also cause the concrete to segregate, especially for novices.

Concrete mixer truck

1. Segregation caused by too much water. The most important thing is that novices are particularly prone to make mistakes. They did not strictly follow the process of using the mixer. When the car was washed the previous day, the water in the mixer was not put, or it was fed directly.

2. Separation of the mixing tank caused segregation. The mixing tank must not be stopped during transportation. The sand, stone, and cement will separate from each other without mixing the concrete, which will cause segregation and deterioration, but at this time, we must worry about the stuffy tank.

3. The rotation speed of the mixing tank is too fast for segregation. If the driver makes the mixing tank rotate too fast during transportation, the heavy gravel will sink under the effect of centrifugal force.

Incorrect tank design

Many people say that the larger the mixing tank is, the easier it is to dilute. Unqualified tank design does cause segregation, but it has little to do with the size of the tank. It is mainly caused by the installation design angle and workmanship of the stirring blade inside the tank.

Concrete mixer truck


The tops made by some small refitting factories have unqualified tank designs, and the blades in the tank may be unevenly stirred and cause segregation. When buying a mixer truck, it is possible to choose well-known big factories as far as possible. Generally, as long as the mixing tanks are produced in regular big factories, there is no problem.

Postscript

Therefore, the main reason for the segregation of the mixer truck is the technical reason of the mixing station, which has nothing to do with the size of the tank of the vehicle. Generally, the skilled driver of the mixer truck is unlikely to segregate normally when using the vehicle. When some mixing stations appear ashes, it may push the cause to the car or the driver. Everyone must strive for it. Of course there is something wrong in the text, please correct me

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