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2. Crushed stone - Wikipedia

   en.wikipedia.org/wiki/Crushed_stone

   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.

3. Gravel - Wikipedia

   en.wikipedia.org/wiki/Gravel

   Gravel (largest fragment in this photo is about 40 mm (1.6 in)) Gravel (/ ˈ ɡ r æ v əl /) is a loose aggregation of rock fragments.Gravel occurs naturally on Earth as a result of sedimentary and erosive geological processes; it is also produced in large quantities commercially as crushed stone.

4. Construction aggregate - Wikipedia

   en.wikipedia.org/wiki/Construction_aggregate

   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 ...

5. R-value (soils) - Wikipedia

   en.wikipedia.org/wiki/R-value_(soils)

   The R-Value test [1] measures the response of a compacted sample of soil or aggregate to a vertically applied pressure under specific conditions. This test is used by Caltrans for pavement design, replacing the California bearing ratio test.

6. Aggregate industry in the United States - Wikipedia

   en.wikipedia.org/wiki/Aggregate_industry_in_the...

   As of 2017, there were about 3600 companies mining sand and gravel, and 1400 thousand mining crushed rock in the United States, with many companies doing both. [3] [4] Top crushed rock companies as of 2015, in order of descending tonnage. The top ten companies provided 45 percent of the crushed rock produced in the US. [5] Rank Company 1.

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