a concrete pile was broken underwater, can it be repaired by patching with new concrete underwater? or does concrete ever cure underwater? why?
2006-08-01 15:07:38 · 2 answers · asked by lauskie 1 in Education & Reference ➔ Special Education
Portland cement is a hydraulic cement, which means that it sets and hardens due to a chemical reaction with water. Consequently, it will harden underwater.
Note: Portland cement is not a brand name, but the generic term for the type of cement used in virtually all concrete, just as stainless is a type of steel and sterling a type of silver. Cement comprises from 10 to 15 percent of the concrete mix, by volume. Through a process called hydration, the cement and water harden and bind the aggregates into a rocklike mass. This hardening process continues for years, meaning that concrete gets stronger as it gets older.
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2006-08-01 15:19:47 · answer #1 · answered by ted_armentrout 5 · 3⤊ 0⤋
concrete does not harden from drying. it chemicaly cures. u concrete can be underwater and it will "dry" just like on land. most cement packages will say if it is or not. most concrete nowadays are waterproof eventho they eed water to activate
2006-08-01 15:14:04 · answer #2 · answered by xirekaj 3 · 0⤊ 0⤋