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A false set is distinguished from a flash set in the laboratory by

  • A.remixing the paste, which restores workability in a false set
  • B.measuring the rise in temperature during the setting period
  • C.weighing the test specimen carefully before and after setting
  • D.examining the hardened paste closely under a microscope

Answer: A

False set is caused by recrystallised gypsum and yields to further mixing, whereas a flash set from aluminate hydration does not. The distinction matters because one is a nuisance and the other makes the cement unusable.

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