Standard Consistency of Cement, Vicat Apparatus, Concrete Technology, Civil Engineering.
Автор: Golden Hued
Загружено: 2023-04-06
Просмотров: 1042
Описание:
Standard and Modified Vicat Apparatus determine consistency, time of set, and false set of hydraulic cement, mortar, and grout as indicated in ASTM and AASHTO test standards applicable to each model. Vicat units are equipped with frame and backlight platform, graduated scale, 10mm (0.4in) dia. plunger assembly, adjustable indicator, mold, and glass plate.
Consistency Test:
To find out the consistency test you have to take a sample of dried cement of about 400 g weight which must pass through the 90 micron IS Sieve. Then mix in it about 25% of water by weight a form a uniform paste withing 2 minutes of time.
Fill the Vicat's mould with this paste and make the 10 mm plunger fixed to the arrangement to just touch the top surface of the cement paste. Make it freely fall and note the amount of penetration.
When the penetration is of about 42 to 45 mm or when the reading on the vertical graduation is about 5mm to 7mm that means cement is of normal consistency. Generally the water required to form a paste of normal consistency is 30%.
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