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One cubic metre of gravel typically weighs about 1,800 kg (4,000 lb), or one cubic yard weighs about 3,000 lb (1,400 kg). Gravel is an important commercial product, with a number of applications. Almost half of all gravel production is used as aggregate for concrete .
Good quality track ballast is made of crushed stone. The sharp edges help the particles interlock with each other. Track ballast supports railway sleepers, which carry railway track. Track ballast is the material which forms the trackbed upon which railroad ties (UK: sleepers) are laid. It is packed between, below, and around the ties. [1]
Crushed stone has one of the lowest average by weight values of all mineral commodities. The average unit price increased from US$1.58 per metric ton, f.o.b. plant, in 1970 to US$4.39 in 1990. However, the unit price in constant 1982 dollars fluctuated between US$3.48 and US$3.91 per metric ton for the same period.
In Europe, sizing ranges are specified as d/D, where the d shows the smallest and D shows the largest square mesh grating that the particles can pass. Application-specific preferred sizings are covered in European Standard EN 13043 for road construction, EN 13383 for larger armour stone, EN 12620 for concrete aggregate, EN 13242 for base layers of road construction, and EN 13450 for railway ...
There are no bridges, trestles, or culverts. Crossties are mostly untreated pine and creosote treated with a small percentage of oak. The rail ranges in weight from 70 to 140 pounds, being mostly new Bessemer. The heavier rail is of the girder type and is used mainly on curves. Crushed stone and cinders are the principal materials used for ballast.
The stone remains widely used in the United Kingdom and Ireland for human body weight: in those countries people may commonly be said to weigh, e.g., "11 stone 4" (11 stones and 4 pounds), rather than "72 kilograms" as in most of the other countries, or "158 pounds", the conventional way of expressing the same weight in the US and in Canada. [38]
Armourstone is a generic term for broken stone with stone masses between 100 and 10,000 kilograms (220 and 22,050 lb) (very coarse aggregate) that is suitable for use in hydraulic engineering. Dimensions and characteristics for armourstone are laid down in European Standard EN13383. [ 1 ]
In 2023, the aggregate industry in the United States mined and sold 1.5 billion tons of crushed stone valued at more than $24 billion and 920 million tons of construction sand and gravel valued at $11 billion. [1] [2] There are thousands of aggregate-producing companies in the US, operating in each of the 50 states, and employing 105,000 people.
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