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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.
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 are the concrete mix additives for fast curing?
You could add lime putty. But the best solution would be to get a cement that sets in the amount of time you need, a 'slow setting cement'.
How does the fineness affect the time of setting?
Setting begins to occur after the concrete is mixed and even before pouring. The cement in the concrete begins to stiffen after mixed with water. The concrete is beginning to change from liquid form to solid form. During the setting process, the concrete does gain strength, which is the beginning of the hardening process. When the water ingredient is added to the concrete mix, the concrete is still pliable and flexible, sort of a paste. There is two stages of setting: initial and final setting. Initial setting is when the concrete loses it flexibility and begins to harden. Final setting is when the concrete can sustain some load, but still has some moisture within the mixture. 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.
Can you reuse the cement after it has crossed its setting time?
yes, if it is before the initial setting time...
How ican extend initial setting time of concrete?
Initial Setting time can be extended by adding retarders during mixing of concrete. Sugar solution is the easily available retarder.
What is initial and final setting time in cement according to ASTM?
Using a Vicat needle, the ASTM determined time for initial concrete setting is equal to or greater than 45 minutes. They set the final setting time is equal to or greter than 375 minutes.
What is vicat apparatus used for?
vicats apparatus is used for initial setting time of cement.
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 does alternate setting mean?
An alternate setting is one that is used when the initial setting is not in use or not available. The preferredis the initial but sometimes an alternate is used in its place.
What are the factors affecting the initial setting time of cement?
When cement is mixed with water, it forms slurry which gradually becomes less plastic with the passage of time & finally a hard mass is obtained. In this process, at a certain stage when the cement paste is sufficiently rigid to withstand a definite amount of Pressure, it is said to have set & the time required to reach this stage is termed as "setting time".
Why is it necessary to add lime to a render mix?
lime is added to sand and portland cement to make mortar plyable and workable, it also adds strength and slows set time. Also it adds Flexibility
Does this cement satisfy astm standard for initial setting time?
does this cement satisfy ASTM standard requirements for normal consistency
Are the head bolts reusable on 1998 KIA Sportage 2.0L engine?
Best to replace - after initial torque setting it is difficult to get an accurate setting a 2nd time (threads have been stretched)
The practice of setting a high initial price for a new product and then gradually lowering the price over time is known as?
Price skimming. <><><><><> Market adjustment.
