Concrete is a general designation of engineering composite materials in which aggregates are cemented into a whole by cementitious materials. Generally speaking, concrete refers to cement concrete made of cement as cementitious material, sand and stone as aggregate, mixed with water in a certain proportion and mixed. It is widely used in civil engineering. The mixer truck is generally divided according to the square quantity. The square quantity refers to the volume of the tank, not the weight of the concrete. The quality of different concrete installed in the mixing tank is also different, because different concrete densities are different. According to the apparent density, the concrete can be divided into three types: heavy concrete, ordinary concrete and light concrete.

自上料搅拌机重混凝土是表观密度大于2500Kg/m3，用特别密实和特别重的集料制成的，比如重晶石混凝土、钢屑混凝土等等，他们具有不透X射线和γ射线的作用，像这种大密度的混凝土运输的过程中，驾驶员是要十分注意的，因为它的密度大，所以同样容积的搅拌车在装运重混凝土时，总质量就会增加很多的，车辆的惯性就会增大很多，因此在车辆的行驶过程中车速不能过快，刹车也不能太急，尤其是转弯，一定放慢车速，谨慎驾驶；还有就是因为其密度大，在搅拌的时候就不太容易，对搅拌车的减速机也是一个考验。

Self feeding mixer heavy concrete is made of particularly dense and heavy aggregates with apparent density greater than 2500kg / m3, such as barite concrete, steel chip concrete, etc. they are impermeable to X-rays and γ During the transportation of high-density concrete, the driver should pay great attention to the role of rays. Because of its high density, the total mass of the mixer truck with the same volume will increase a lot when loading heavy concrete, and the inertia of the vehicle will increase a lot. Therefore, the speed of the vehicle can not be too fast, and the braking can not be too fast, especially when turning, Be sure to slow down and drive carefully; In addition, because of its high density, it is not easy to mix, which is also a test for the reducer of the mixer truck.

自上料搅拌机普通混凝土就是我们在建筑中常用的混凝土，它的表观密度在1950-2500Kg/m3之间，集料为砂、石等等，这种混凝土是搅拌车常运输的一种，在装料，卸料按照规定来做就行，运输时间一定不要超过混凝土凝结的时间。

Self loading mixer ordinary concrete is the concrete commonly used in buildings. Its apparent density is between 1950-2500kg / m3, and the aggregate is sand, stone, etc. this kind of concrete is often transported by mixer truck. It can be done according to the regulations during loading and unloading, and the transportation time must not exceed the concrete setting time.

轻质混凝土是表观密度小于1950Kg/m3的混凝土，它又可以分为轻集料混凝土，多孔混凝土，大孔混凝土。这些混凝土的密度相对较小，装运在搅拌罐内，整车的质量相对较轻，驾驶员在驾驶过程中也就相对比较轻松。

Lightweight concrete is concrete with apparent density less than 1950kg / m3. It can be divided into lightweight aggregate concrete, porous concrete and macroporous concrete. The density of these concrete is relatively small. When they are transported in the mixing tank, the weight of the whole vehicle is relatively light, and the driver is relatively easy to drive.