What is the final setting time of cement?
What is the final setting time of cement?
Detailed Solution
| Cement | Initial setting time | Final setting time |
|---|---|---|
| Ordinary Portland cement | 30 minute | 10 hours |
| Rapid hardening cement | 30 minute | 10 hours |
| High alumina cement | 3.5 hour | 5.5 hour |
| Low heat cement | 1 hour | 10 hours |
What should be the initial setting time of cement?
Initial Setting time of Cement:- The time available for mixing the cement and placing it in position is an Initial setting time of cement. If delayed further, cement loses its strength. For Ordinary Portland Cement, The initial Setting Time is 30 minutes.
What are the initial and final setting time of cement as per IS 269?
A period of 30 minutes is the minimum initial setting time, specified by ISI for ordinary and rapid hardening Portland cements and 60 minutes for low heat cement.
What is initial set of concrete?
Initial set, as defined by ACI 116R, is a degree of stiffening of a mixture of cement less than final set, generally stated as an empirical value indicating the time in hours and minutes required for the cement paste to stiffen sufficiently to resist to an established degree, the penetration of a weighted test needle.
What is the setting of cement?
As the reaction between water and cement continues, the plasticity of the cement paste is lost. This early period in the hardening of cement is known as ‘Setting of Cement’.
What is initial time?
Initial setting time of cement is defined as the time elapsed between the moments when water is added to the cement to the time when the cement paste starts losing its plasticity.
What is initial and final setting of cement?
The time elapsed between the moments when water is added to the cement to the time when the square needle penetrates a depth of 33 to 35 mm from the top of the mould is known as the Initial Setting Time of that cement. The initial Setting Time should not be less than 30 minutes for Ordinary Portland Cement.
What is initial and final setting time?
Initial setting time duration is required to delay the process of hydration or hardening. Final setting time is the time when the paste completely loses its plasticity. It is the time taken for the cement paste or cement concrete to harden sufficiently and attain the shape of the mould in which it is cast.
What is setting for cement?
What is initial setting time of low heat cement?
60 minutes
The initial setting time of low heat cement is 60 minutes (minimum) and the final setting time is 10 hours (max). The hydration heat released by low heat Portland cement is low and the release process is gentle.
What is cement setting?
