Civil Engineering - Building Materials - Discussion

Lime pozzolana mixture has three types.

LP40 initial setting time is 2 hrs (120 mins) and final setting time is 24 hrs (M4 Grade).

LP20 initial setting time is 2 hrs (120 mins) and final setting time is 36 hrs (M2 Grade).

LP7 initial setting time is 2 hrs (120 mins) and final setting time is 48 hrs (M07 Grade).

This mixture used for masonry mortar, foundation concrete, leveling coarse under floors, road and airfield bases, precast building blocks.

Refer for more details IS:4098-1967.

What is all type of cement final and initial setting time?

STANDARD SPECIFICATION:

Type/Name Of Cement, Referenced Indian Standard, Initial Setting Time, mints (min), Final Setting Time, mints (max).

OPC(33), IS:269, 30, 600.

OPC(43), IS:8112, 30, 600.

OPC(53), IS:12269, 30, 600.

SRC, IS:12330, 30, 600.

PPC, IS:1489, P1, 30, 600.

RHPC, IS:8041, 30, 600.

PSC, IS:455, 30, 600.

High alumina, IS:6452, 30, 600.

Super sulphated, IS:6909, 30, 600.

Low heat, IS:12600, 60, 600.

Masonry cement, IS:3466, 90, 1440.

IRS-T-40, Railway, 60, 600.

Pozzolana take that much time because as it contain silicate it react with lime to form c-s-h gell. But it a slow reaction process. While on the other hand cement react with h2O to form a solid structure.

Initial setting time is 30 min is correct answer.

Initial setting time OPC cement is 30 min it is correct answer.

Initial setting time of OPC is 30 min.

Initial setting time of OPC is 90 min.

What is the final setting time to this cement?

Why its takes to more initial setting ? Please explain me or what is the reason?