Discussion
State whether the following is true or false.
Setting and hardening of cement are the same process under two names.
Answer: D
Correct answer: False
Setting is the loss of plasticity - the paste stiffens and can no longer be placed or compacted - and it is measured by penetration in the Vicat test. Hardening is the development of strength thereafter, and it continues for months. A mix can be set and still have almost no strength, which is exactly why the initial setting time governs how long there is to place the concrete and says nothing about when it may be loaded.
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