Pre-cast Slab

Hollow core slabs are pre-stressed concrete elements, cast with advanced extrusion technique. Cores are made in the thickness running along the length with advanced machinery. The slabs are manufactured in different thickness and length. The standard width of the slabs is 1200 mm. Our production and erection procedures comply with British standards and ministry specifications.

Hollow core slabs are lighter by less than 50% of normal reinforced concrete slabs. This enables to design the light structural frame. The reduced structural frame and flooring slabs lead to reduce the size of the foundation. This saves the construction time and overall cost of the project.

Hollow core slabs are used in all applications where floors or roofs are required.

  • Private Houses And Villas
  • Residential Complexes
  • Commercial Buildings
  • Auditoriums And Halls
  • Car Parks

Advantages

  • All weather flooring
  • Ease and speed of installation
  • Time-saving & cost effective
  • Facilities for electrical & mechanical fittings
  • Excellent noise reduction & fire resistance
  • Longer span and greater loads than conventional slabs
  • Smaller deflection for superimposed loads

Table for Allowable Service Load in KN/sq meter for 150mm HCS

Strand Area of Steel (mm²) Mu (KN-m) Span
4.00 M
Span
4.50 M
Span
5.00 M
Span
5.50 M
Span
6.00 M
Span
6.50 M
Span
7.00 M
4 x 9.30 208.00 27.68 9.268 6.848 5.116
5 x 9.30 260.00 31.17 10.724 7.998 6.048 4.605
6 x 9.30 312.00 34.63 12.163 9.135 6.969 5.366 4.147
7 x 9.30 364.00 38.04 10.258 7.879 6.188 4.779 3.737
8 x 9.30 416.00 41.42 8.779 6.862 5.404 4.269 3.369
9 x 9.30 468.00 44.75 7.597 6.021 4.795 3.823

 

160mm Slab Section and Materials Properties

Net Area 102859 mm² Strength of Concrete 75 N/mm²
Moment of Inertia 275.1E+6 mm4 Strength of Release 30 N/mm²
Centroid From Bottom 75.00 mm Density of Concrete 2400 Kg/m³
Section Modulus Top 3668172 mm³ Ultimate Steel Strength 1770 Mpa
Section Modulus Bottom 3668172 mm³ Strand Type Low Relaxation

Table for Allowable Service Loads in KN/sq meter for 160mm HCS

Strand Area of Steel (mm²) Mu (KN-m) Span
4.00 M
Span
4.50 M
Span
5.00 M
Span
5.50 M
Span
6.00 M
Span
6.50 M
Span
7.00 M
7 x 9.30 364.00 44.24 7.244 5.686 4.475 3.513
8 x 9.30 416.00 48.15 8.106 6.411 5.092 4.045
9 x 9.30 468.00 52.02 8.958 7.127 5.702 4.571

 

150mm Slab Section and Materials Properties

Net Area 114299 mm² Strength of Concrete 75 N/mm²
Moment of Inertia 362.6E+6 mm4 Strength of Release 30 N/mm²
Centroid From Bottom 84.63 mm Density of Concrete 2400 Kg/m³
Section Modulus Top 4811203 mm³ Ultimate Steel Strength 1770 Mpa
Section Modulus Bottom 4284395 mm³ Strand Type Low Relaxation
Self Weight 2.51 KN/m²

Table for Allowable Service Loads in KN/sq meter for 200mm HCS

Strand Area of Steel (mm²) Mu (KN-m) Span
6.00 M
Span
6.50 M
Span
7.00 M
Span
7.50 M
Span
8.00 M
Span
8.50 M
Span
9.00 M
5 x 9.30 260.00 51.11 6.700 5.300 4.189 3.292 2.559
7 x 9.30 364.00 61.38 8.601 6.920 5.586 4.509 3.629
4×9.3 + 3×12.5 487.00 72.69 10.697 8.705 7.125 5.851 4.807 3.943
3×9.3 + 4×12.6 528.00 76.56 9.316 7.652 6.309 5.211 4.300 3.537
7 x 12.5 651.00 88.02 9.211 7.668 6.404 5.357 4.480

 

200mm Slab Section and Materials Properties

Net Area 126659 mm² Strength of Concrete 75 N/mm²
Moment of Inertia 593.1E+6 mm4 Strength of Release 30 N/mm²
Centroid From Bottom 87.42 mm Density of Concrete 2400 Kg/m³
Section Modulus Top 5268360 mm³ Ultimate Steel Strength 1770 Mpa
Section Modulus Bottom 6784737 mm³ Strand Type Low Relaxation
Self Weight 2.76 KN/m²

Table for Allowable Service Loads in KN/sq meter for 220mm HCS

Strand Area of Steel (mm²) Mu (KN-m) Span
7.00 M
Span
7.50 M
Span
8.00 M
Span
8.50 M
Span
9.00 M
Span
9.50 M
Span
10.00 M
4×9.3 + 3×12.5 487.00 95.61 9.763 8.087 6.715 5.577 4.624 3.818 3.129
3×9.3 + 4×12.5 528.00 100.68 10.452 8.687 7.242 6.045 5.041 4.192 3.467
2×9.3 + 5×12.5 569.00 105.71 11.137 9.283 7.766 6.509 5.455 4.563 3.802
7 x 12.5 651.00 115.66 12.492 10.463 8.803 7.428 6.275 5.299 4.466

 

220mm Slab Section and Materials Properties

Net Area 149539 mm² Strength of Concrete 75 N/mm²
Moment of Inertia 993.5E+6 mm4 Strength of Release 30 N/mm²
Centroid From Bottom 110.19 mm Density of Concrete 2400 Kg/m³
Section Modulus Top 9047128 mm³ Ultimate Steel Strength 1770 Mpa
Section Modulus Bottom 9015784 mm³ Strand Type Low Relaxation
Self Weight 3.24 KN/M²