News
What equipment is used for construction waste asphalt concrete blocks
Time: 2021-05-21
Used for construction waste asphalt concrete block mobile crushing plant. Asphalt concrete is a mixture of framework material and asphalt. The framework material used is the same as cement concrete, which is also divided into coarse framework material and fine framework material. Coarse skeleton material refers to crushed stone with a particle size of 2.5-20mm, and fine skeleton material refers to sand with a particle size of 2.5mm or less. The bitumen used is straight-run bitumen (the bitumen made directly from the residue after distilling various oils from petroleum). Straight-run asphalt is solid at room temperature. When the temperature rises to 40-50°C, it becomes soft, and when it reaches 150°C, it becomes liquid and can be mixed with the framework material. The temperature drops back to the solid state. In order to meet the requirements of the thickness of the asphalt coated on the surface of the framework material and the requirements of the stability of the mixture, stone powder is usually added as a filler. The weight ratio of coarse aggregate, fine aggregate, filler and asphalt is (50～70):(20～40):(3～8):(5～7).
Asphalt mixtures are divided into several types due to the different particle size of the framework materials used, such as: dense particle size mixture, coarse particle size mixture, open particle size mixture and sand glue. Generally, the surface layer of the road is made of a dense-grained mixture that is easy to form a flat pavement, and the dense-grained mixture uses fine-grained materials; the base layer underneath mostly uses a coarse-grained mixture, and the coarse-grained mixture uses a coarse-grained coarse-grained material; The use of large-grained coarse framework materials increases the porosity, and is mostly used for water-permeable pavements; sand glue has less coarse aggregate content, more fillers and asphalt, and has higher water resistance. It is mostly used for bridge pavements.
79% of the waste asphalt concrete blocks are generated from road repair works and municipal works such as the burying of upper and lower water pipes, and the remaining 21% comes from civil engineering. The size of the waste asphalt concrete block is the same as that of the waste concrete block, with a diameter of 50-100 cm.
