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Major Difference In Sand And Wash Sand Of River In Zimbabwe

River sand is quite suitable if clean if not, it should be washed.Coarse stone aggregate must be clean and free from soil and dirt.Ideally, it should be a graded mixture of stones from 2 mm to 50 mm.River washed pebbles and gravel are suitable if clean.A suitable mix is 1 part cement by volume, 3 parts sand, 6 parts stone.

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