Sea sand is obtained from sea beaches. It consists of fine round grains like river sand. The color of sea sand is light brown. Because sea sand contains salts, it attracts moisture from the atmosphere. Such absorption causes dampness, swelling and breakage of the work. Sea sand increases the setting time of cement. Therefore, it is a general rule to avoid using sea sand for engineering purposes even though it is available in abundance. However, after removing the salts by washing, it can be used as a topical material.
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