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PRESTRESSED CONCRETE SLAB Prestressed Concrete Slab It is 5cm prestressed component,with 2 standard width of 30 and 35cm. The length is variable to fit the project. The lower surface is a smooth fair face concrete and the upper surface is roughened to interface with the 2nd phase concrete. These plank slab are made under TISI มอก. 576-2531, มอก. 828-2531 standard.        Advantages : save time and money, not easily bend, durable    and fire resistance