Cement-aggregate ratio? Answered
Can you give some recipes, for when starting with plain cement, sand and water? Of course, I imagine it also depends on the cement used, but I also imagine that adding too much or too little cement to the mix has an influence on the strength of the cured product. Or at least describe what happens when there's too much cement - the obvious thing that's happening when there's too little is that the resulting concrete is too weak.