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2. Environmental impact of concrete - Wikipedia

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

   Concrete has a total embodied energy of 1.69 GJ/tonne, lower per unit mass than most common building materials besides wood. However, concrete structures often have high masses, so this comparison is not always directly relevant to decision making. Additionally, this value is based only on mix proportions of up to 20% fly ash.

3. Bag (unit) - Wikipedia

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

   Bags have been used as standard measures for a variety of commodities which were actually supplied in bags or sacks. These include: Cement is commonly sold in bags of 94 pounds weight, because this is about 1 cubic foot of powdered cement. [1] Agricultural produce in England was sold in bags which varied in capacity depending on the place and ...

4. List of unusual units of measurement - Wikipedia

   en.wikipedia.org/wiki/List_of_unusual_units_of...

   [citation needed] In the concrete and petroleum industry, however, a bag of cement is defined as 94 lb (43 kg) because it has an apparent volume close to 1 cubic foot (28 litres). [65] When ready-mix concrete is specified, a "bag mix" unit is used as if the batching company mixes 5 literal bags of cement per cubic yard (or cubic metre) when a ...

5. 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 ...

6. Concrete - Wikipedia

   en.wikipedia.org/wiki/Concrete

   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 of steel, wood, plastics, and aluminium combined. [3]

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