Initial Set
The point at which cement paste begins to stiffen and lose plasticity. Marks the end of the workable period.
Initial set determines how long fresh concrete can be transported and placed. For OPC the minimum initial setting time is 30 minutes per IS 4031.\n\nIn hot weather, initial set can occur within 45-60 minutes — plan TM dispatch and placement accordingly.
The time it takes cement paste to lose plasticity and harden. Measured as Initial Set (start of stiffening) and Final Set (no longer deformable).
The point at which cement paste has fully hardened and can resist a defined indentation. After this, no further finishing or remixing is possible.
An admixture that delays the initial setting of concrete. Used in hot weather, long hauls, or large pours to extend the workability window.