Concrete is the combination of cement, water, fine aggregates[sand] & coarse aggregates. what will happen when we use desert sand instead of sand. what is the effect on strength, workability,durability???
Desert sand will have little to no moisture, therefore the absorption of the dessert sand have to be determined first and complemented for in the mix design. Another thing to consider is the fineness modulus of the sand and see if it is within acceptable limits for the desired application.
Without taking these physical properties of the dessert sand into consideration, their use will lead to decrease in workability which might have a considerable detrimental effect on the strength and durability of the resulting concrete
Dune sand deposited by Aeolian process (transported by the action of wind) commonly known as Desert Sand. Civil Engineering Hazards are associated with such sands due to fine to very fine grain sizes having diameter 0.25–0.063 mm. The grain surfaces are smooth, feel slurry slip, and less bearing strength that seldom offer any efficient chemical bonding to be used as an ingredient of concrete for use as a construction material, especially in their untreated state.
Dune Sands can be make useful for construction through Cement Stabilization process particularly in Saudi Arabia to build an internationally recognized road network connecting newly developed areas of the kingdom.
my opinion is.........
1.Because of transportation cost.
**But in future when natural sand most disappears.
We have to use this Desert sand...**
I feel dune sand is having low shear strength with weak bonding..so this material can be used with additive to strengthen the bonding for getting better cementing effect in concrete..
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