| Why are you worrying about how much sand you may need? It's the cheapest thing you will be buying, you are buying the materials so you have to sort out where they will be kept and work out how much sand will be soiled from dirt contamination, ie a 10 wheel truck full of sand starts at 3,000 odd baht, where will you put it? How much will be in contact with the dirt? How much wastage will you have as dirt isn't a good mixer for concrete, once you work out how you will order and store sand then an amount can be worked out, sand doesn't neatly stack into piles like bricks and blocks do, will you put something down on the dirt to protect the sand, maybe a small concreted area for the sand, these are things you have to work out as you are buying the materials.
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