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Concrete is made by mixing sand, stone and cement with water. The amount of each material is called the concrete mix ratio. By varying the amount of each ingredient in the mix, you can change the characteristics of the concrete. Most structural concrete walls are built with at least psi concrete.

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P J Brick/Stone Work. Weston Super Mare • Member since 3 Mar • 55 jobs, % positive feedback. Block's on flat. about 16/17 bags of sand. cement 5 bags. mortar joints can vary on blockwork maybe - or +. hope this helps. pj. Answered 23rd Aug