Рет қаралды 904
Setting Time Test of Concrete is required to know the initial and final setting time of concrete.
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, the Initial setting time of concrete is the time period between the 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. The final setting time is the time period between the time water is added to cement and the time at which 1 mm needle makes an impression on the paste in the mould but a 5 mm attachment does not make any impression.
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