Step 1: From the construction site to the factory landfill is no longer the first choice for building waste. From waste to a resource that can benefit future generations, the first step to go through is to pull the construction waste from the construction site to a factory that can handle it. For the past 30 years, the consistent destination of construction waste has been the low-lying areas and potholes naturally or formed in the outskirts of cities. Over time, the problem of construction waste occupying land has become increasingly prominent, and as legal landfills become fewer and farther away, it has become increasingly difficult to dispose of construction waste; More importantly, landfilling can cause varying degrees of pollution to the air, soil, and groundwater. It is in this context that the concept of resource utilization has begun to frequently appear in policy documents and public view. Construction waste is not truly useless. On the contrary, concrete blocks, rocks, steel bars, and other materials can be recycled and reused. The process of turning what people think of as garbage into reusable products is called resource utilization.

Step 2: From the input to the output, the soil, concrete, and metal are each placed in their respective positions. The construction waste is then transported to the factory, and the pre sorting and crushing unit begins to operate. Under the treatment of the dust and mist cannon, workers inspect the surface of the construction waste to see if there are any visible useless components, such as tarpaulins, rubber, wood, plastics, etc; On the open space next to it, a hook machine with replaced drill bits breaks up excessive construction waste; The shovel pushes construction waste of appropriate size into the entrance of the jaw crusher buried underground. To reduce dust, a dust removal device can be installed at the inlet of the crusher. The logic of the entire production line is actually to separate construction waste according to its composition, and prepare high value-added components into reusable raw materials: after the first crushing, the material is sent up by a conveyor belt and passed through an iron remover to separate and recycle large pieces of metal (mainly steel bars); Then pass through a heavy sieve, sieve out the soil, and directly enter the slag silo; After screening the soil, the material enters the positive pressure air selection device and is blown out with wind to remove some relatively large light substances, such as plastic, wood chips, and paper. ”After the first round of crushing, screening, and impurity removal, the material is relatively clean and the composition is relatively simple, basically consisting of concrete blocks or bricks. Subsequently, they will enter the impact crusher and transform into particles with diameters ranging from a few millimeters to tens of millimeters, known as recycled aggregates, through repeated rotation and impact.

Step 3: Meet again from the factory to the construction site, road, and park. The recycled aggregate has been produced, where will it go? In construction engineering, sand and gravel are one of the most important materials. Sand and gravel play a crucial role in the paving of pavement base, the preparation of mortar, and the production of concrete and bricks. However, sand and gravel resources are limited, and excessive mining can bring ecological hazards, while recycled aggregates can replace the use of sand and gravel under the premise of meeting technical standards. Recycled aggregate for hollow blocks and insulation blocks can function independently even without being mixed with other materials such as cement. In garden landscaping, coarse aggregate is first used to create undulations on the ground, covered with a layer of organic soil, then a layer of fine aggregate is laid, followed by another layer of organic soil. The top layer is planted with trees and grass, forming a sponge like soil that is both permeable and capable of storing water. Although construction waste has a large volume, it is basically a "producible material" that can be transformed. However, due to the overall low concentration of the renewable resource recycling industry and the difficulty of a qualitative change in the "low small scattered" pattern in the short term, the "collection operation use" system for construction waste is still some way from maturity. However, with the improvement of people's environmental protection concepts and the guidance of the government on design and construction parties, the application of resource-based products will have a broad market space, and the management of construction waste will naturally become smoother.