The document discusses the use of construction debris as an aggregate substitute in manufacturing hollow concrete blocks and pavement blocks. Debris collected from construction sites is crushed and screened to sizes suitable for fine and coarse aggregates. These aggregates are then mixed with cement and water to form blocks using molds. The blocks are cheaper than traditional clay bricks and help reduce environmental degradation from debris dumping. Using debris also promotes environmental protection by reducing the impacts of landfilling and clay brick production.