OPGS (enriched sand and gravel mixture)
enriched (OPGS) - obtained from natural sand and gravel mixtures by enrichment) - in accordance with the requirements of building codes and regulations for the relevant types of construction work. The strength of gravel included in the natural and enriched sand-gravel mixture, the content of weak rock grains in it and frost resistance must meet the requirements of GOST 8267-93. In a natural sand-gravel mixture, the content of gravel grains larger than 5 mm should be no less than 10% and no more than 95% by weight.
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