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Q: The time interval for cement products remains in plastic condition is known as
  • A. Final setting time
  • B. Initial setting time
  • C. Expansion time or Contraction time
  • D. None of the above
Correct Answer: Option B - Determination of initial and final setting time– When water is added to cement, the resulting paste starts to stiffen and gain strength and lose the consistency simultaneously. The term setting implies solidification of plastic cement paste. Initial and final setting times may be regarded as the two stiffening states at the cement. The beginning of solidification called the initial set. • Marks the point in time when the paste has become unworkable the time taken to solidify completely mark the final set, which should not be too long in order to resume construction activity within a reasonable time after the placement of concrete.
B. Determination of initial and final setting time– When water is added to cement, the resulting paste starts to stiffen and gain strength and lose the consistency simultaneously. The term setting implies solidification of plastic cement paste. Initial and final setting times may be regarded as the two stiffening states at the cement. The beginning of solidification called the initial set. • Marks the point in time when the paste has become unworkable the time taken to solidify completely mark the final set, which should not be too long in order to resume construction activity within a reasonable time after the placement of concrete.

Explanations:

Determination of initial and final setting time– When water is added to cement, the resulting paste starts to stiffen and gain strength and lose the consistency simultaneously. The term setting implies solidification of plastic cement paste. Initial and final setting times may be regarded as the two stiffening states at the cement. The beginning of solidification called the initial set. • Marks the point in time when the paste has become unworkable the time taken to solidify completely mark the final set, which should not be too long in order to resume construction activity within a reasonable time after the placement of concrete.