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Q: What is flash and false setting of cement?
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What is false setting of cement?

False-setting is when cement abnormally and prematurely sets.


What is the difference between false set and flash set of cement?

False set occurs when cement appears to set but can still be remixed and flow, while flash set is a rapid and irreversible setting of cement that cannot be reversed. False set can be corrected by adding more water and re-mixing, while flash set requires the cement to be discarded and fresh cement to be used.


Why 2 gypsum is added in the cement?

Gypsum is added to cement to control the setting time of the cement and prevent early hydration, which can affect the workability of the concrete mixture. It also helps in preventing flash setting and cracking in the final concrete structure.


How gypsum effect the setting time of cement?

gypsum increase the setting time of cement.


What is the importance of setting time?

because when we know the setting time of cement we easily identified that where can we use the cement according to there setting time.


Can you reuse the cement after it has crossed its setting time?

yes, if it is before the initial setting time...


Why gypsum added to cement?

3% of gypsum is added to cement to "prevent the rapid setting of cement"


What is the effect on setting time of cement if water added is less or more than 85 percent of normal constituency of cement?

how the water mixed with cement affects the time of its setting


What is the importance of setting time of cement?

because when we know the setting time of cement we easily identified that where can we use the cement according to there setting time.


Why 2 of gypsum is added to cement?

Gypsum is added to cement to decrease the setting time.


What is initial setting time of cement?

It's the time from which cement starts the setting process after water is added.. Usually it is 30 min.. It can be delayed or advanced using chemicals..


Can you use trisodium citrate as a cement retarder?

Yes, trisodium citrate can be used as a cement retarder. It works by delaying the hydration process of cement, which slows down the setting time. Trisodium citrate is often preferred for its ability to control the setting time of cement mixes effectively.