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Because of heavy salt content and other undesirable salts which when formed a part of concrete, reacts to form compounds which harm and corrode concrete. They are also more irregular shape then river sand which is rounded in nature.
Marine sands have mechanical, chemical and physical properties identical to the high quality land-based sands and as such the end users are no different. They are also widely used in the production of:
• Mortar for bricklaying and block making
• Screeds
• External renders
• Internal rendering
• Masonry blocks
• Paving blocks
If a civil engineer goes though the procedure of chloride penetration test in concrete/RCC, he can answer the question. Sea/beach sands contain more NaCl which can bring down the structure life to5 years or even less, if the weather is humid.
Salt causes faster deterioration and corrosion.
because sea water contains some ingredients that may cause the concrete to be decreased in strength and may have cracks after drying , for example , salt sulfur etc.
Sea sand contains the salts which would result in much faster deterioration of the structures.
even sea sand contains salt ,it can be used after cleaning with water.
we already used it in Algeria for many projects specialy for bridge and offshore constrctions without any problem ;itr was accepted by laboratory
Why not? we can even make concrete with seawater if necessary. I know that sea salt and cement aren't friends in the mixture
sea sand contains salts which deteriorates the plastered surface and the slab surface and in the long run cause seepage in the building.
The excessive presence of salt causes deterioration of the structure. reduces the durability
Because it contains salts,higher values of sulphates and chlorides
as we know that sea sand are contain with salt and if we use it directly without washing with sweet water it will cause our concrete strength to deteriorate or lessen the strength of our concrete and may cause for cracking of the structure
