Multiple choice

______ is addad to cement to slow down its rate of setting.

  1. Plaster

  2. Gypsm

  3. Ca(OH)2

  4. NaOH

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gypsum is added to cement to retard or slow down its setting time. This is crucial for construction applications where extended workability is needed. Gypsum controls the flash setting of cement by reacting with C3A (tricalcium aluminate) to form ettringite, preventing immediate hardening.