Discussion
Expansive and shrinkage-compensating cements differ from ordinary cement in that they
Answer: B
Correct answer: expand slightly during early hydration
A controlled expansion during hardening puts the concrete into compression against its restraint, which offsets the drying shrinkage that follows. The object is a member that ends up at or near its original length rather than cracked, and reinforcement is essential to provide the restraint the expansion works against.
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