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concrete will and this is scientifically proven, do the following:
1)get hard
2) it will leak
3) it will crack
4) it will not burn
5)and concrete should never be mixed with ocean sand and ocean water. why? just ask the u.s. army corp of engineers and the pier they built in the 1900's off lahaina harbor,maui,hawaii! (clue........its underwater now!)
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