The following are the properties of good sand
o
It should be chemically inert.
o
It should be clean and coarse.
o
It should be free from any organic or vegetable
matter. Usually 3- 4% of clay is
permitted.
o It
should contain sharp, angular, coarse and durable grains.
o It
should not contain salts, which attracts moisture from atmosphere.
o
It should be well graded, i.e., it should
contain particle of various sizes in suitable proportion. The fineness modulus
of sand between 2 to 3.
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