Fine aggregate and coarse aggregate.

Wednesday, December 8, 2010

Fine aggregate is natural sand which has been washed and sieved to remove particles larger than 5 mm and coarse aggregate is gravel which has been crushed, washed and sieved so that the particles vary from 5 up to 50 mm in size. The fine and coarse aggregate are delivered separately. Because they have to be sieved, a prepared mixture of fine and coarse aggregate is more expensive than natural all-in aggregate. The reason for using a mixture of fine and coarse aggregate is that by combining them in the correct proportions, a concrete with very few voids or spaces in it can be made and this reduces the quantity of comparatively expensive cement required to produce a strong concrete.

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1 comentarios:

Unknown said...

This is really helpful to know how the particles vary from 5 mm and 50 mm. We're looking to get some aggregate service for this portion of this building. Do you know what we should consider? The mixture is the most important thing to get right.

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