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  2. Dimension stone - Wikipedia

    en.wikipedia.org/wiki/Dimension_stone

    Tile is a thin modular stone unit, commonly 12 inches (300 mm) square and 3 ⁄ 8 inch (9.5 mm) deep. Other popular sizes are 15 inches (380 mm) square, 18 inches (460 mm) square, and 24 inches (610 mm) square; these will usually be deeper than the 12-inch square.

  3. Concretion - Wikipedia

    en.wikipedia.org/wiki/Concretion

    Other "pop rocks" are small polycuboid pyrite concretions, which are as much as 7 cm (0.23 ft) in diameter. These concretions are called "pop rocks" because they explode if thrown in a fire. Also, when they are either cut or hammered, they produce sparks and a burning sulfur smell.

  4. Board foot - Wikipedia

    en.wikipedia.org/wiki/Board_foot

    The board foot or board-foot is a unit of measurement for the volume of lumber in the United States and Canada [1].It equals the volume of a board that is one foot (30.5 cm) in length, one foot in width, and one inch (2.54 cm) in thickness, or exactly 2.359 737 216 liters.

  5. Floor area - Wikipedia

    en.wikipedia.org/wiki/Floor_area

    In architecture, construction, and real estate, floor area, floor space, or floorspace is the area (measured in square metres or square feet) taken up by a building or part of it. The ways of defining "floor area" depend on what factors of the building should or should not be included, such as external walls, internal walls, corridors, lift ...

  6. Concrete - Wikipedia

    en.wikipedia.org/wiki/Concrete

    The world record for largest continuously poured concrete floor was completed 8 November 1997, in Louisville, Kentucky by design-build firm EXXCEL Project Management. The monolithic placement consisted of 225,000 square feet (20,900 m 2) of concrete placed in 30 hours, finished to a flatness tolerance of F F 54.60 and a levelness tolerance of F ...

  7. Tunnel construction - Wikipedia

    en.wikipedia.org/wiki/Tunnel_construction

    Tunnel Construction. Tunnels are dug in types of materials varying from soft clay to hard rock. The method of tunnel construction depends on such factors as the ground conditions, the ground water conditions, the length and diameter of the tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and shape of the tunnel and appropriate risk management.