Civil Engineering - Building Materials - Discussion

Initial setting time should be less than 70 mins.

30 minute is the right answer.

30 minute is the correct answer.

The initial setting time is 30minutes.

Thank you everyone for giving a description.

The initial setting time of lime-pozzolana is generally two hours (120 minutes).

This is the time it takes for the cement paste to start losing its plasticity when mixed with water.

The correct answer is 120 minutes.

Lime-Pozzolana (120 minutes): This mixture has a slower chemical reaction compared to standard Portland cement. As per standards like IS 4098, the initial setting time is generally specified as two hours (120 minutes) to allow the slow pozzolanic reaction between lime and silica to begin.

30 minutes: This is the minimum initial setting time for Ordinary Portland Cement (OPC) and Portland Pozzolana Cement (PPC).
60 minutes: This is typically the minimum initial setting time for Low Heat Cement.
90 minutes: While some specific masonry cements or asbestos cement products might have a 90-minute requirement, it is not the standard for general lime-pozzolana mixtures.

Answer: The initial setting time of lime-pozzolana is 120 minutes because the reaction between lime and pozzolanic materials is relatively slow compared to standard cement hydration.

What is the final setting time to this cement?

What is a final setting time of lime-pozzolona, is?

Initial setting time is up to 15 mins then, of final setting time is up to 6 hours.