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2. Concrete slab - Wikipedia

   en.wikipedia.org/wiki/Concrete_slab

   A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Steel- reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving ( see below ).

3. Hollow-core slab - Wikipedia

   en.wikipedia.org/wiki/Hollow-core_slab

   The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3–3/4 the thickness of the slab. This makes the slab much lighter than a massive solid concrete floor slab of equal thickness or strength. The reduced weight also lowers material and transportation costs.

4. Properties of concrete - Wikipedia

   en.wikipedia.org/wiki/Properties_of_concrete

   Reactive powder concrete, also known as ultra-high-performance concrete, can be even stronger, with strengths of up to 800 MPa (116,000 PSI). [4] These are made by eliminating large aggregate completely, carefully controlling the size of the fine aggregates to ensure the best possible packing, and incorporating steel fibers (sometimes produced ...

5. Waffle slab - Wikipedia

   en.wikipedia.org/wiki/Waffle_slab

   The underside of a waffle slab, showing the grid like structure. A waffle slab or two-way joist slab is a concrete slab made of reinforced concrete with concrete ribs running in two directions on its underside. [1] The name waffle comes from the grid pattern created by the reinforcing ribs.

6. Water–cement ratio - Wikipedia

   en.wikipedia.org/wiki/Water–cement_ratio

   A w/c ratio higher than 0.60 is not acceptable as fresh concrete becomes "soup" [2] and leads to a higher porosity and to very poor quality hardened concrete as publicly stated by Prof. Gustave Magnel (1889-1955, Ghent University, Belgium) during an official address to American building contractors at the occasion of one of his visits in the ...

7. Warning to stay away from concrete slab over cliff - AOL

   www.aol.com/news/warning-stay-away-concrete-slab...

   Warning to stay away from concrete slab over cliff. Stuart Maisner - BBC News, South East. November 28, 2024 at 5:50 AM. ... "Due to its size and location, we are liaising with engineering ...