As steel rebar rusts, it expands up to 10 times its original volume. This expansion puts immense internal pressure on the surrounding concrete.
Visualizing the dense reinforcement required for load-bearing connections. 3. Crack Propagation and Failure Modes toh rebar crack
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The depth of the concrete matrix above the reinforcement—known as the concrete cover—is a primary defense against cracking. "toh" could be an abbreviation or acronym