Reasons for concrete segregation of mixer truck type:
Original Source: home of the truck: Xu Chong concrete mixer using the most troublesome in addition Menguan, segregation problems are also very troublesome. The bigger the mixing tank, the easier it is to segregate. What is the reason for the segregation? The main reason for the segregation is the technical problem of the mixing station, but improper use of the mixer can also cause concrete segregation. â— What is the phenomenon of concrete segregation? Simply put, it is the separation of mortar and gravel, the main material in concrete. The more professional explanation from the Baidu Encyclopedia is that the cohesion between the materials of the concrete mixture is not sufficient to resist the sinking of the coarse aggregate, and the components of the concrete mixture are separated from each other, resulting in non-uniform internal composition and structure.
â— The technical problems of the mixing plant are mainly due to the technical problems of concrete separation mainly mixing with concrete at the mixing plant. Different grades of concrete have strict specifications, and improper use of water, cement, gravel, and admixtures may cause concrete segregation. Mainly by the following and several situations:
1, improper water ratio. More water, less cement, etc. will cause segregation.
2, the sand quality is not good. There are many stones in the sand. Excessive water content can also cause segregation.
3, gravel grading is not good. Increased particle size, poor gradation, and single gradation can easily cause segregation of concrete.
4, plus an excessive amount of admixtures. Excessive amounts of admixtures such as retarders or poor admixture with cement can also cause segregation of concrete.
â— Do not neglect the use of mixer trucks Although the main cause of concrete segregation is the technical problem of the mixing station, improper use of the mixer truck during transportation and use may also cause concrete segregation, especially for novices.
1, the amount of water caused by the segregation. The main reason is that novices are particularly prone to making mistakes. They have not strictly followed the mixer's use procedures. When the car was washed on the first day, the water in the mixing tank was not released, or they were fed directly without being discharged.
2. Stirring tank stalls cause segregation. The mixing tank must not be stopped during transportation. Without concrete mixing, sand, stone, and cement will separate from each other, and the segregation will deteriorate. But at this time, you must worry about stuffy tanks.
3, stirring tank speed too fast segregation. If the driver makes the speed of the stirring tank too fast during transportation, the heavier gravel subsides under the effect of centrifugal force.
Improper design of the tank will also segregate Many people say that the larger the tank is, the easier it is to leave the tank. The failure of the tank design will indeed create segregation, but it is not related to the tank size. It is mainly caused by the installation design angle of the mixing vanes inside the tank body and the unqualified workmanship.
The tops of some small refitting factories do not meet the requirements of the design of the tank body, and the uneven mixing of the blades in the tank body will cause segregation. When buying a mixer, there are conditions to try to choose a well-known large factory. Generally, there is no problem as long as it is a stirred tank produced in a regular factory.
â— Postscript:
Therefore, the main reason for the segregation of the mixer truck is the technical reason of the mixing station. Regardless of the size of the vehicle tank, it is unlikely that the normally skilled mixer truck driver will segregate. When some mixing stations have appeared away from thin ash, they may push the cause to the body of the vehicle or the driver. Everyone must strive for the best. Of course, what's wrong in the text? Please also correct me.
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