Gravel material is
For the installation of ballast of industrial railways, natural gravel material is often used. Natural gravel material should have grains with a size of 3 to 60 mm at least 50%(by weight), sand grains — in an amount of 30 to 50%, grains less than 0.1 mm — not more than 6%, including clay particles — no more than 1 % by weight.
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