Abstract：The fineness table for the classification of construction sand in the national standard
Coarse sand: The fineness modulus is 3.7-3.1, and the average particle size is more than 0.5mm.
Medium sand: the fineness modulus is 3.0-2.3, and the average particle size is 0.5-0.35mm.
Fine sand: The fineness modulus is 2.2-1.6, and the average particle size is 0.35-0.25mm.
Extra-fine sand: The fineness modulus is 1.5-0.7, and the average particle size is below 0.25mm.
The larger the fineness modulus, the coarser the sand. The fineness modulus of ordinary concrete sand is in the range of 3.7-1.6, medium sand is appropriate, or coarse sand and a small amount of fine sand are used, and the ratio is 4:1.
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