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Determination of setting time of Cement Paste

For ordinary Portland cement the initial time of setting is not less than 45 minutes and the final time of setting is not more than 375 minutes by Vicat test.

  • Initial setting time of cement is important, to know when the cement is starting to lose its plasticity. It is helpful in determining the time needed for the concreting process, i.e. transportation, placing and compaction of concrete.
  • Final setting time of cement is important to know when the cement would be set. This testing of cement is helpful to determine safe removal time of side of form (not vertical support) or scaffolding of concrete

Course Solutions

Abstract

Determination of setting time of Cement Paste, The formulation of a quick, economical and trustworthy method for predicting

the mechanical performance of cement pastes in time is rather helpful when developing new materials.

In this effort, two different cement types with increasing water/cement (w/c) ratios were evaluated in terms of consistency, setting times (ST) and their compressive elastic moduli (𝐸).

The initial setting time of concrete is the time when cement paste starts hardening while

the final setting time is the time when cement paste has hardened

sufficiently in such a way that a 1 mm needle makes an impression

on the paste in the mould but 5 mm needle does not make any impression.

Theoretically, Initial setting time of concrete is the time period between

addition of water to cement till the time at 1 mm square section

needle fails to penetrate the cement paste, placed in the Vicat’s mould 5mm to 7mm from the bottom of the mould.

Final setting time, time period between water added to cement

and the time at which 1 mm needle makes an impression on the paste in the mould but 5 mm attachment does not make any impression.

Determination of setting time of Cement Paste

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