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  2. Bag (unit) - Wikipedia

    en.wikipedia.org/wiki/Bag_(unit)

    The Oxford English Dictionary has a definition of "bag" as "A measure of quantity for produce, varying according to the nature of the commodity" and has quotations illustrating its use for hops in 1679, almonds in 1728 (where it is defined by weight as "about 3 Hundred Weight " i.e. 336 pounds (152 kg) in Imperial units) and potatoes in 1845 ...

  3. Water–cement ratio - Wikipedia

    en.wikipedia.org/wiki/Water–cement_ratio

    Water–cement ratio. The water–cement ratio ( w/c ratio, or water-to-cement ratio, sometimes also called the Water-Cement Factor, f) is the ratio of the mass of water ( w) to the mass of cement ( c) used in a concrete mix: The typical values of this ratio f = w⁄c are generally comprised in the interval 0.40 and 0.60.

  4. Environmental impact of concrete - Wikipedia

    en.wikipedia.org/wiki/Environmental_impact_of...

    The environmental impact of concrete, its manufacture, and its applications, are complex, driven in part by direct impacts of construction and infrastructure, as well as by CO 2 emissions; between 4-8% of total global CO 2 emissions come from concrete. [ 1] Many depend on circumstances.

  5. Coal combustion products - Wikipedia

    en.wikipedia.org/wiki/Coal_combustion_products

    With housing sector consuming 67% of the cement, there is a huge scope for incorporating fly ash in both the increasing share of PPC and low to moderate strength concrete. There is a misconception that the Indian codes IS 456:2000 for Concrete and Reinforced Concrete and IS 3812.1:2013 for Fly Ash restrict the use of Fly Ash to less than 35%.

  6. Ecology block - Wikipedia

    en.wikipedia.org/wiki/Ecology_block

    An ecology block, also known as an eco-block or ecoblock, is a type of recycled concrete block used to make retaining walls. Ecology blocks are manufactured using concrete left over from other construction processes. A cross-section of an eco-block typically measures 2 feet (61 cm) square, with block lengths ranging from 3 feet (91 cm) to 6 ...

  7. Cement - Wikipedia

    en.wikipedia.org/wiki/Cement

    Cement is seldom used on its own, but rather to bind sand and gravel together. Cement mixed with fine aggregate produces mortar for masonry, or with sand and gravel, produces concrete. Concrete is the most widely used material in existence and is behind only water as the planet's most-consumed resource. [2]

  8. Baggage allowance - Wikipedia

    en.wikipedia.org/wiki/Baggage_allowance

    The recommendations for checked baggage are: advised maximum weight 23 kg (50.7 lbs), weight limit 32 kg (70.6 lbs), advised maximum size 158 cm (62.2 in) length + width + height, limit 203 cm (nearly 80 in). The limit of 23 kg is present because of similar limits in health and safety regulations. Because of the wide variation in hand/carry-on ...

  9. Concrete - Wikipedia

    en.wikipedia.org/wiki/Concrete

    A single concrete block, as used for construction. Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures to a solid over time. Concrete is the second-most-used substance in the world after water, [1] and is the most widely used building material. [2] Its usage worldwide, ton for ton, is twice that ...