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  2. 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.

  3. 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 ...

  4. Gypsum concrete - Wikipedia

    en.wikipedia.org/wiki/Gypsum_concrete

    Gypsum concrete is lightweight and fire-resistant. A 1.5-inch slab of gypsum concrete weighs 13 pounds per square foot versus 18 pounds per square foot for regular concrete. [10] Even though gypsum concrete weighs less, it still has the same compressive strength as regular concrete, based on its application as underlayment or top coat flooring ...

  5. Screed - Wikipedia

    en.wikipedia.org/wiki/Screed

    The screed on this paver spreads and smooths the asphalt.. Screed has three meanings in building construction: . A flat board (screed board, floating screed) or a purpose-made aluminium tool used to smooth and to "true" materials like concrete, stucco and plaster after they have been placed on a surface or to assist in flattening; [1]

  6. Specific surface area - Wikipedia

    en.wikipedia.org/wiki/Specific_surface_area

    Specific surface area (SSA) is a property of solids defined as the total surface area (SA) of a material per unit mass, [1] (with units of m 2 /kg or m 2 /g). Alternatively, it may be defined as SA per solid or bulk volume [2] [3] (units of m 2 /m 3 or m −1).

  7. Foam concrete - Wikipedia

    en.wikipedia.org/wiki/Foam_concrete

    Foamed concrete can be produced with dry densities of 400 to 1600 kg/m 3 (25 lb/ft 3 to 100 lb/ft 3), with 7-day strengths of approximately 1 to 10 N/mm 2 (145 to 1450 psi) respectively. Foam concrete is fire resistant, and its thermal and acoustical insulation properties make it ideal for a wide range of purposes, from insulating floors and ...

  8. Solid ground floor - Wikipedia

    en.wikipedia.org/wiki/Solid_ground_floor

    After the floor has been laid with screed, these tiles are fixed with adhesive. They are attractive, smooth and cool, and damage can be repaired very easily as they are made in small square size, usually 150 mm to 225 mm. Though due to poor workmanship and dust this type of floor finish fails through lifting. [1]

  9. Free floating screed - Wikipedia

    en.wikipedia.org/wiki/Free_floating_screed

    Adjusting screed settings will change the placement depth and width, as well as amount of material being placed. Many modern screeds can be run in an automatic mode, too. [1] Because the only connection between the asphalt paver and the screed is the tow arm, the screed can "float" vertically relative to the paver.

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