The first kind is slurry waste, which is mainly the "mixed liquid" generated by cleaning the barrel of concrete transport vehicle and mixer. It contains "diluted" concrete components and needs to enter the concrete sand-gravel separator to separate the sand and gravel for commercial concrete. After the slurry is precipitated, the slurry paste is used as the raw material for making ordinary concrete bricks, and the water can be recycled.
the second category is lumpy wastes, which mainly come from concrete test blocks in laboratories and concrete blocks removed from concrete transport vehicles, mixers and production sites (such as the ground). These hardened concretes have a certain strength, and after being crushed into a certain particle size by a small crusher, they become recycled concrete aggregates to replace some stone chips as raw materials for making ordinary concrete bricks.
the third category is concrete mixture, which mainly comes from the returned concrete mixture after pouring in the construction site and the returned concrete mixture with unqualified slump. These mixtures can be treated in a sand-gravel separator or used to manufacture ordinary concrete bricks.