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False-setting is when cement abnormally and prematurely sets.
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∙ 9y ago
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Can you reuse the cement after it has crossed its setting time?
yes, if it is before the initial 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..
What is rain forced cement concrete?
It is not rain forced but re-inforced cement concrete. It means the concrete after setting and hardening.
What is initial Setting time?
An arbitrary division has been made for the setting time of cement as initial setting time and final setting time.It is difficult to draw a rigid line between these two arbitrary divisions.For convenience,initial setting time is regarded as the time elapsed between the moment that the water is added to the cement,to the time that the paste starts losing its plasticity.The final setting time is the time elapsed between the moment that the water is added to the cement ,and the time when the paste has completely lost its plasticity and has attained sufficient firmness to resist certain definite pressure.
How can you make portland cement as quick setting and water resistance cement?
Please note that a key correction in terminology is essential before your question can be answered: use the word "concrete" instead of "cement." The answer is to modify your mix (i.e. Portland cement, sand, gravel, and water) by using hydraulic cement to repace part of the Portland cement. The higher the amount of hydraulic cement you add, the quicker the setting time and the impermeability. However, hydraulic cement sets so quickly that you have limit the amount of total mix so as to be able to pour it and form it before it sets.
What is flash and false setting of cement?
yes I'm also little confused ..
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.
Property of cement?
The properties of cement are,Chemical compositionLoss on ignitionInsoluble residuessulphur content and magnesia contentSoundnessHeat of hydrationSetting timeInitial setting timeFinal Setting timeFinenessStrength of cementConsistency.
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..
What is the final setting time if cement?
initialy setting time up to 10min. & final setting time upto 10 hours
Does this cement satisfy astm standard for initial setting time?
does this cement satisfy ASTM standard requirements for normal consistency
