After the development of cities and the increase in the size and volume of buildings and the existence of many restrictions to make concrete at the construction site, concrete production companies were formed in cities to meet the needs of builders.
Due to the distance of the concrete companies from the project site and the limitations of the physical and chemical properties of concrete, such as initial setting and proper mixing of concrete, new machines have entered the production cycle that can play a decisive role in optimizing this performance. . As a result, Truck Mixer or Concrete Mixer Truck was made. It should be mentioned that in some concrete manufacturing methods, the truck mixer is also used as a device to complete the concrete manufacturing process.
Mixer's main components
A. Truck: Special trucks with different capacities are used to transport and move concrete, on which other concrete maintenance equipment will be installed. b. Concrete storage tank: This tank is installed on the truck with a special slope, which has an inlet for concrete input and an outlet for concrete output. Also, due to the mixing of concrete inside the tank and the possibility of removing concrete from the tank, blades have been installed around the tank. The figure below shows the blades inside the tank of a truck mixer. c. Water tank: In some concrete manufacturing methods, it is necessary to add water to the concrete during transportation. There is also a need to wash the concrete storage tank, funnel and concrete removal shot after emptying the concrete. For this reason, next to the concrete storage tank, a water storage tank has also been placed to be used when needed.
D. Funnel and vertical shot: At the outlet of the concrete storage tank and in order to transfer concrete to the desired location, funnels and vertical shots are used.
Mixer Track Category
Truck mixers are divided into different categories according to the capacity of carrying concrete, the items used, and the type of design. Below is a brief description of these cases.
Concrete carrying capacity: Truck mixers can have different carrying capacities that are related to the capacity of the concrete storage tank and the capacity of the truck. Fatal depends. But in general, track mixers with a capacity of 7, 8, 9, and 12 cubic meters are very common, which are used according to the amount of concreting. /b> According to the concrete production methods, truck mixers can perform concrete mixing operations in the tank and in the required cases in addition to transporting and storing concrete. As a result, in addition to the transfer and transportation of ready concrete, the track mixer can also perform the mixing process at the same time. have different For example, we can refer to the types of rear discharge and front discharge truck mixers. The figure below shows a type of forward discharge mixer track.
Tips on using the tracks of mixers
In using truck mixers, important points should be considered in order to carry out the operation of transferring and mixing concrete correctly. Some of these points are mentioned below.
. The maximum size of the materials that can be mixed in the truck mixer with reverse movement is 50 mm.
Concrete with a slump of less than 50 mm cannot be mixed in a truck mixer.
The more viscous the concrete, the more difficult it is for the truck mixer to mix and remove the concrete.
In order to transport concrete, the volume of concrete that is poured into the truck mixer tank must be 80% of the nominal capacity of the truck mixer tank.
In order to mix concrete in the truck mixer, 63% of the nominal capacity of the tank of the truck mixer should be poured into the tank.
The sum of the total revolutions of the track mixer tank should not exceed 300 revolutions.
The truck mixer tank must rotate at least 70 and at most 100 revolutions for concrete mixing operations.
The concrete carrying time should not exceed 90 minutes, unless the desired concrete has not reached the initial setting.
In general, it can be said that truck mixers have come to help the construction industry to transport concrete. The truck mixer facilitates the transportation of concrete from the concrete production plant to the project site. The design of the truck mixer has made the quality standards of concrete not be compromised and the physical and chemical properties of concrete are not affected. This helps to increase the quality of construction projects.