What do you understand by construction and demolition (C&D) waste? Explain in brief.

Construction and demolition (C&D) waste refers to the debris and materials that are generated during the construction, renovation, and demolition of buildings, infrastructure, and other structures. This type of waste includes a wide variety of materials, ranging from concrete, bricks, wood, glass, and metal to plastics, insulation materials, and hazardous substances like asbestos or lead paint. The volume of C&D waste is significant, making it one of the largest waste streams globally, with considerable implications for the environment, public health, and urban management.

### Types of Construction and Demolition Waste

C&D waste can be categorized into two main types based on its source and nature: construction waste and demolition waste. 

1. Construction Waste: This is generated during the building phase of construction projects. It includes excess materials, such as concrete, wood, steel, drywall, and packaging. Construction waste is typically generated due to poor planning, over-ordering of materials, and the cutting or alteration of materials to fit specific dimensions. Some of the common construction waste materials include:

   - Concrete and cement: The most abundant waste in construction, often resulting from excess mix or demolished sections of buildings.
   - Wood: Wood from scaffolding, formwork, and packaging is commonly _________ ________ ___ ____ ___ ________ ____ ___ __________ ____.
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