They have found that concrete poured under water for bridges is much
stronger and harder and last much longer than other concrete. After testing to
find out why they come up with the answer.
Pack damp sand in a box and remove the box and see how much weight it
holds when dry, try it with dry sand. Next pack wet sand and water it down, it
will settle and compress even more. After it dries, it is especially adhesive
to it's self and will withstand an extreme amount of weight.
When roads are made with concrete you will notice that they use more water
on it than is needed just to keep it wet from cracking.
......................bob
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