Concrete mix ratios are generally based on the standard C30 mix (1:2:3).
For example: 100 pounds of cement, 200 pounds of sand, and 300 pounds of gravel.
The selection of stone diameter is based on the inner diameter of the cement pipes. For cement pipes with an inner diameter of 300-600MM, stones with a diameter of 5-20MM are typically used. For cement pipes with an inner diameter of 800-1500MM, stones with a diameter of 10-30MM are required.




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