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Hollowcore (HC) Slabs |
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The precast concrete slab has tubular voids extending the full length of the slab, |
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typically with a diameter equal to the 2/3-3/4 of the slab. This makes the slab much |
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lighter than a massive floor slabs of equal thickness or strength. Reduced weight is |
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important because of transportation cost and less cost of material (concrete). The slabs |
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are typically 120 cm wide with standard thicknesses between 15 cm and 50 cm. All the |
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thicknesses can be increased by 10 or 20 mm according the fire rate required. |
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Hollowcore Slabs are made with G45 concrete and 3/8", ½” strands ASTM A416 as |
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standard. |
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Slabs are usually produced in lengths of about 150 meters. The process involves |
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extruding wet concrete (semi dry mix) along with the prestressing strands from a |
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moving mold. The continuous slab is then cut by big diamond circular saw according to |
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the lengths (and width) required on blueprint. Factory production provides the obvious |
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advantages of reduced time, labor and training. |
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