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