According to the moisture content of the concrete shipped by the concrete mixer truck, there are three types of mixer trucks: wet material type, dry material type and semi-dry material type.
Most of the domestic use wet material concrete mixer truck, which can transport the concrete produced by the mixing plant (station) or the aggregate (sand, gravel), cement and water mixed according to the ratio. During the transportation, the wet material is continuously and slowly Stir to prevent initial setting and segregation of concrete during transportation. However, the time from production to pouring of concrete should generally not exceed 1.5 hours to prevent the concrete from setting. Therefore, in the case of longer-distance transportation, it is necessary to use dry and semi-dry material mixer trucks for transportation.
The dry material mixer truck can directly load the dry aggregate and cement into the mixing drum of the truck according to the ratio, and the dry material in the drum will be mixed during the transportation process. Finish mixing the concrete.
The aggregate and cement in the concrete shipped by the semi-dry mixer truck are also prepared according to the ratio, and contain a certain amount of water, but the water content does not meet the pouring requirements. Add water and stir.