Retempering of mortar, if needed, should be generally done within ______.
A) 1 h of the initial preparation of mortar.
B) 4 h of the initial preparation of mortar.
C) 5-1/2 h of the initial preparation of mortar.
D) 2-1/2 h of the initial preparation of mortar.
E) none of the above.
D) 2-1/2 h of the initial preparation of mortar.
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