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HOLLOWCORE FLOORS
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300 mm deep Hollowcore slab
300 mm hollowcore


self weight of precast unit (without structural screed): 4.09 kN/m2
concrete strength at service (28 days): 50 N/mm2
concrete strength at transfer: 30 N/mm2
prestressing strands: 7 wire 9.3 mm strand
fpu = 1700 N/mm2
prestressing: 70% fpu
maximum number of strands: 14
cover to strand: 25 mm
fire resistance (BS8110:Part 1:1997; Table 4.9): 1 hour
minimum required effective bearing width (BS8110:Part 1:1997; Clause 5.2):
on concrete: 55 mm
on structural steel: 40 mm
on masonry: 65 mm

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