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.
Advantages
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 |
