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  2. Concrete degradation - Wikipedia

    en.wikipedia.org/wiki/Concrete_degradation

    A violet color indicates still alkaline areas and thus non-carbonated concrete. Carbonated zones favorable for steel corrosion and concrete degradation are colorless. [3] [4] The presence of water in carbonated concrete is necessary to lower the pH of concrete pore water around rebar and to depassivate the carbon steel surface at low pH.

  3. Stalactite - Wikipedia

    en.wikipedia.org/wiki/Stalactite

    A stalactite (UK: / ˈ s t æ l ə k ˌ t aɪ t /, US: / s t ə ˈ l æ k t aɪ t /; from Ancient Greek σταλακτός (stalaktós) 'dripping', from σταλάσσειν (stalássein) 'to drip') [1] is a mineral formation that hangs from the ceiling of caves, hot springs, or man-made structures such as bridges and mines.

  4. Calthemite - Wikipedia

    en.wikipedia.org/wiki/Calthemite

    Calthemite straw stalactite growing from the concrete ceiling of an undercover car-park Calthemite straw stalactites, the rightmost example demonstrating bending due to the direction of air currents during its formation. Calthemite is a secondary deposit, derived from concrete, lime, mortar or other calcareous material outside the cave environment.

  5. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    A general note applies generally and is not called out with flags. 2. Find number: "FN" meaning "find number" refers to the ordinal number that gives an ID tag to one of the constituents in a parts list (list of materials, bill of materials). Thus "fasten using FN7" refers to a fastener that is "find number" 7 in the list. FoS: feature of size

  6. Construction site safety - Wikipedia

    en.wikipedia.org/wiki/Construction_site_safety

    Various workplace safety signs commonly used at construction sites and industrial work environments. The leading safety hazards on construction sites include falls, being caught between objects, electrocutions, and being struck by objects. [23] These hazards have caused injuries and deaths on construction sites throughout the world.

  7. 30 Intriguing Posts From This Page Dedicated To Ancient History

    www.aol.com/mysteries-marvels-past-70-posts...

    With its spectacular stalactite formations and crystal-clear waters, this geological marvel has been sculpted by nature's hand over millions of years, creating an enchanting world beneath the surface.

  8. Traffic warning sign - Wikipedia

    en.wikipedia.org/wiki/Traffic_warning_sign

    These signs are often temporary in nature and used to indicate road work (construction), poor roads, or temporary conditions ahead on the road including flagmen, uneven pavement, etc. (Note that some "high water" signs are posted to alert drivers of a flood-prone area and do not actually mean that there is a flooded section of road ahead.)

  9. Construction surveying - Wikipedia

    en.wikipedia.org/wiki/Construction_surveying

    Stake out lot corners, stake limit of work and stake location of construction trailer (clear of all excavation and construction) Stake out reference points and markers that will guide the construction of new structures; Verify the location of structures during construction; Provide horizontal control on multiple floors