About 70% of the cement produced in China is mixed with different amounts of granulated slag. In China, more than 80% of blast furnace slag is made into granulated slag every year as cement mixing material. Therefore, it is a high-quality cement raw material. It has potential hydraulic cementitious properties, which can be shown under the action of cement clinker, lime, gypsum and other activators. After the molten slag is quenched with a large amount of water, it can be made into fine-grained water slag dominated by glass. This kind of slag gravel is called “all-round engineering aggregate”.Īlso known as water quenched slag and water slag. After crushing and screening, it is made into gravel and slag sand to replace natural sand and gravel as concrete, reinforced concrete and prestressed reinforced concrete aggregate below 500, The heat-resistant concrete aggregate with working temperature below 700 ℃ requires wear-resistant and anti-skid paving materials for expressways, racetracks, aircraft runways, railway ballast, pit filling, and foundation cushion filler, sewage treatment medium, etc. It is cooled by water spray and dug out after solidification. After the slag is discharged from the furnace, it flows into the pit through the slag ditch and is spread into a thin layer with a thickness of about 15 cm. A partition wall is built in front of the blast furnace from the floor to the furnace platform to form a slag splashing pit. Blast furnace slag can also be used to produce slag wool (a white cotton like mineral fiber obtained by melting the slag in the melting furnace and refining it), glass ceramics, silicon calcium slag fertilizer, slag cast stone, hot cast slag, etc.Īlso known as hot slag and heavy slag. it can also be used in load-bearing structures. It can be used to make lightweight aggregate, inner wall panels, floors, etc. The production methods include spray method, trench method and roller method. The expanded slag ball is a porous lightweight slag formed by cooling the slag with high cooling water. It can be used for: preparing slag crushed stone concrete, applying in soft foundation, paving asphalt pavement with slag crushed stone as base material, which is bright and has good anti-skid performance, good wear resistance, shortening braking distance Used for railway ballast, it can properly absorb the vibration and noise generated when the train is running. In China, slag crushed stone can replace natural stone for highway, airport, foundation engineering, railway ballast, concrete aggregate and asphalt pavement.
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