Civil Engineering - Concrete Technology - Discussion

Discussion Forum : Concrete Technology - Section 1 (Q.No. 48)
48.
Pick up the correct statement from the following:
Gypsum in cement decreases the setting time
The first compound of cement which reacts with water, is C2S
Bulking of sand is less when its particles are fine
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
5 comments Page 1 of 1.

Susil said:   3 weeks ago
Please explain the correct answer.

Yash swami said:   12 months ago
Does anyone explain the answer clearly?

Dharmendra ku yadav said:   1 decade ago
Gypsum is retarde this component increase setting time.
(4)

Emily said:   1 decade ago
Yeah, gypsum is added to avoid flash setting.

Rahul said:   1 decade ago
Gypsum not decreases the setting time but it increases (lengthen, retard or slowdown setting time) suppose cement setting time is 30 min, when we can add gypsum to the cement at the time of grinding of clinkers then gypsum can slowdown the setting, setting increases from 30 min to 60 min it means it cannot decreases the setting time decrease means cement setting is 30 min decrease means 30 min to 20 min but this is wrong. Right answer is gypsum increases, lengthen, slowdown setting time of cement.
(3)

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