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  2. Self-leveling concrete - Wikipedia

    en.wikipedia.org/wiki/Self-leveling_concrete

    Self-leveling concrete was invented in 1952 by Axel Karlsson from Sweden. The first product was a combination of wood glue, fine sand and cement with additives. [1] It was called flytspackel, which directly translates to "floating putty". The term self-leveling can be traced back to a patent applied by the company Lafarge in 1997. [2]

  3. Underfloor air distribution - Wikipedia

    en.wikipedia.org/wiki/Underfloor_air_distribution

    UFAD systems use an underfloor supply plenum located between the structural concrete slab and a raised floor system to supply conditioned air to supply outlets (usually floor diffusers), located at or near floor level within the occupied space. Air returns from the room at ceiling level or the maximum allowable height above the occupied zone. [1]

  4. Types of concrete - Wikipedia

    en.wikipedia.org/wiki/Types_of_concrete

    Gypsum concrete is a building material used as a floor underlay [44] used in wood-frame and concrete construction for fire ratings, [44] sound reduction, [44] radiant heating, [45] and floor leveling. It is a mixture of gypsum, Portland cement, and sand. [44] One of its advantages is the lightweight nature.

  5. Raised floor - Wikipedia

    en.wikipedia.org/wiki/Raised_floor

    An alternative raised floor application with disposable formworks from job site in Turkey A suction-cup tile lifter has been used to remove a tile.. A raised floor (also raised flooring, access floor(ing), or raised-access computer floor) provides an elevated structural floor above a solid substrate (often a concrete slab) to create a hidden void for the passage of mechanical and electrical ...

  6. These vascular risks are strongly associated with severe ...

    www.aol.com/news/controlling-three-things...

    Hypertension, atrial fibrillation and smoking pose a stronger risk for severe stroke, according to a new study. However, lifestyle changes can help prevent stroke.

  7. Teen may be tried as adult for stabbing 13-year-old ...

    www.aol.com/teen-arrested-stabbing-13-old...

    A middle school cheerleader in Tennessee was stabbed to death by a 15-year-old boy — and now prosecutors are aiming to try him as an adult. Savannah Copeland, a 13-year-old...

  8. More details about JFK assassination keep emerging, even 61 ...

    www.aol.com/more-details-jfk-assassination-keep...

    Sixty-one years ago, on November 22, 1963, President John F. Kennedy was assassinated in Dallas, Texas, in a shocking tragedy that still echoes. The JFK assassination sent the nation into mourning ...

  9. Solid ground floor - Wikipedia

    en.wikipedia.org/wiki/Solid_ground_floor

    A solid ground floor consists of a layer of concrete, which in the case of a domestic building will be the surface layer brought up to ground floor level with hardcore filling under it. The advantage of a solid ground floor is the elimination of dry rot and other problems normally associated with hollow joisted floors.

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