Question

sand particles are separated from gravel at construction sites using sieving why
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Answer 1

Answer:

Screening of cargoes as they are loaded is commonly employed when dredging for sand or gravel to ensure specific sand:gravel ratios are retained in the dredging vessel. Exceptionally, this can involve the rejection of up to 5 times as much sediment over the side of the vessel as is kept as cargo.

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Answer 2

Answer:

Sand particles are very very small while gravel grains are very thick.

So when sieve is used, Gravel collects on the sieve while sand particles pass through it.