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

自上料搅拌车。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. The apparent density of heavy concrete is more than 2500kg / m3, which is made of very dense and heavy aggregate, such as barite concrete, steel chip concrete, etc. they are impervious to X-rays and gamma rays. In the process of transportation of such high-density concrete, the driver should pay great attention to it. Because of its high density, the mixer truck with the same volume is transporting heavy concrete The total mass will increase a lot, the inertia of the vehicle will increase a lot, so in the process of driving the vehicle, the speed should not be too fast, the brake should not be too fast, especially when turning, we must slow down the speed and drive carefully; and because of its high density, it is not easy to mix, which is also a test for the reducer of the mixer.

自上料搅拌车。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 feeding mixer. Ordinary concrete is commonly used in construction. Its apparent density is between 1950-2500kg / m3, and the aggregate is sand, stone and so on. This kind of concrete is often transported by mixer truck. When loading and unloading, it should be done according to the regulations. The transportation time must not exceed the setting time of concrete.

自上料搅拌车。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。

Self feeding mixer. Lightweight concrete is the 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.