| 摘要 |
PURPOSE: Provided are a lightweight aggregate for construction and its manufacturing method which are made of a low quality of clay-based raw materials such as clay and shale, changing of the reaction factors such as machining temperature, heat treatment temperature, heat treatment time, and so forth. CONSTITUTION: The manufacturing method comprises the following steps: (1) grinding process in which a clay and a shale are grinded to less than 30 micrometer and 70-100 micrometer with ball mil, respectively. (2) manufacturing of the specimen in which after 20-40 wt.% of a distilled water is added into the clay and 30 wt.% of the shale is mixed with the clay, 10-15mm of sphere or 50x50x50mm¬2 of plate is formed from the mixture and dried at the room temperature for 72 hours. (3) heat treatment in which the dried specimen is charged into the electric furnace and heated at 1200°C for 30 minutes. (4) grinding process in which the heat-treated specimen is grinded to the particles having the constant size for the lightweight aggregate.
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