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NATURE OF THE WAFFLE SLAB
www.atex.com.br
As of common knowledge, solid slabs have a constant height (hM) once the slab`s
volume is completely filled with concrete. Concrete resists to compression and steel
resists to traction.
However, in 1854 the British engineer Willian Boutland Wilkinson experimented
removing from the solid slab part of the traction section’s concrete that had no
structural function. After such a pioneer and successful idea, it was concluded that
solid slabs have unnecessary concrete that is poured only to fill a gap, therefore
increasing the structural weight. This new type of slab was named waffle slab due to its
shape, with ribs and toppings.
Solid slab:
Waffle slab:
The weight decrease mentioned above results in expressive savings of the use of
concrete and steel, summing around 30% in slabs. Slabs usually corresponds to about
60% of a building's structure, and as structures represents approximately 30% of the
works` cost, the use of waffle slabs result in savings of about 5,4% in the works` total
costs (30% x 60% x 30% = 5,4%), not to mention savings in other elements of the
works, such as columns, fundations and CO₂.
Example:
Let´s consider a solid slab 13,5m x 13,5m and hM =32cm
If we keep the same inertia and transform this solid slab into a Waffle slab 13,5m x
13,5m and hM=42,5 + 5,0 cm with Atex900x425 mould, we will achive these following
results:
NATURE OF THE WAFFLE SLAB
www.atex.com.br

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Concrete Magazine Article 2021

  • 1. NATURE OF THE WAFFLE SLAB www.atex.com.br As of common knowledge, solid slabs have a constant height (hM) once the slab`s volume is completely filled with concrete. Concrete resists to compression and steel resists to traction. However, in 1854 the British engineer Willian Boutland Wilkinson experimented removing from the solid slab part of the traction section’s concrete that had no structural function. After such a pioneer and successful idea, it was concluded that solid slabs have unnecessary concrete that is poured only to fill a gap, therefore increasing the structural weight. This new type of slab was named waffle slab due to its shape, with ribs and toppings. Solid slab: Waffle slab: The weight decrease mentioned above results in expressive savings of the use of concrete and steel, summing around 30% in slabs. Slabs usually corresponds to about 60% of a building's structure, and as structures represents approximately 30% of the works` cost, the use of waffle slabs result in savings of about 5,4% in the works` total costs (30% x 60% x 30% = 5,4%), not to mention savings in other elements of the works, such as columns, fundations and CO₂. Example: Let´s consider a solid slab 13,5m x 13,5m and hM =32cm If we keep the same inertia and transform this solid slab into a Waffle slab 13,5m x 13,5m and hM=42,5 + 5,0 cm with Atex900x425 mould, we will achive these following results:
  • 2. NATURE OF THE WAFFLE SLAB www.atex.com.br