Addition of 2% gypsum in cement________________?
Correct answer: C. Prevents rapid hardening
- A. Triggers hydration
- B. Triggers hydrolysis
- C. Prevents rapid hardening
- D. all of the above
Explanation
About 2% gypsum is added to cement to react with the highly reactive aluminate component and control the setting time, thereby preventing rapid hardening. It does not trigger hydrolysis, so students may choose option d by treating every chemical reaction involving water as hydrolysis. The topic label is approximate because cement chemistry is not separately represented in the available topic list.
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About Adhesives
Adhesives are substances that join surfaces through bonding, wetting and hardening, and may be natural or synthetic. The topic covers starch, dextrin, casein, animal glue, rubber-based adhesives and polymeric resins, together with the effects of viscosity, setting time, temperature, moisture and surface condition on adhesive strength.
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