What is all construction waste

In a nutshell, construction waste is the waste generated during the new construction, alteration, expansion and demolition activities of a structure. Specifically, construction waste refers to solid waste generated during the construction, maintenance and demolition of buildings, mainly including waste concrete blocks, waste asphalt concrete blocks, and mortar, concrete, and crushed brick slag scattered during the construction process.

According to the source classification, construction waste can be divided into five categories, including land excavation, road excavation, old building demolition, building construction and building materials production waste, of which the waste generated by old building demolition and building construction accounts for the majority. Although the contents of various components of the waste generated from different types of structures are different, its basic composition is the same, which is mainly composed of soil, slag, scattered mortar and concrete, masonry and concrete debris produced by picking and chiseling, reinforced concrete pile head cut off by piling, metal, bamboo and timber, waste materials produced by decoration, various packaging materials and other wastes, and so on.

Characteristics of Construction Waste Because most of the construction waste is solid waste, including soil, stones, concrete blocks, broken bricks, wood, metal, pipes and electrical appliances and other wastes, non-polluting inorganic materials (including soil, stones, concrete blocks, broken bricks) account for more than 90 per cent. Inorganic materials, with acid resistance, alkali resistance, water resistance, more stable chemical properties, as well as the characteristics of stable physical properties. These properties of construction waste determine that it is a good recycled construction material after treatment. Waste products (including metal, bamboo wood, various packaging materials, wood, plastic, glass, etc.) that may have pollutants can be utilised as recycled resources after sorting. Construction waste is the cleanest waste in the municipal waste, as long as it is used reasonably, it will not produce secondary pollution. At present, due to the construction site rarely classify the construction waste, coupled with the domestic waste is also mixed with it, increasing the pollution of construction waste, but also increase the difficulty of treatment.

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