Discussion
Expansive cement is designed to
Answer: A
Correct answer: expand slightly on setting to offset shrinkage
Concrete shrinks as it dries, and where it is restrained that shrinkage puts it into tension and cracks it. An expansive cement generates a controlled expansion during setting - usually by forming ettringite deliberately - which, held by the reinforcement, leaves the concrete in mild compression instead. It is used for shrinkage-compensating slabs and for grouts that must fill a space completely.
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