Jun 23, 2020 A common concrete mixture is 1:2:3, that is 1 part cement, 2 parts sand, and 3 parts rock or gravel. In many parts of the world this method is still common. They load the mixer with shovels full of each material (1 shovel of cement, 2 shovels of sand, 3 shovels of rock) and add water until the concrete looks “right.”
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