Standard consistency of cement.
To determine the quantity of water required to produce a cement paste of standard consistency. The standard consistency is that consistency, which will permit the vicat plunger to penetrate to a point 5 to 7mm from the bottom of the vicat mould when tested.
The vicat apparatus consist of a frame having a movable rod with a cap at one end and at the other end any one of the following attachments, which are interchangeable:
- Needle for determining the initial setting time (cross sectional area of 1mm2, with a flat end)
- Needle for determining the final setting time (circular sectional area of 1mm2, fitted with metal attachment. The end of the needle projects beyond the cutting edge of the hollowed out metal attachment)
- Plunger for determining the standard consistency (polished brass 10 +- 0.05mm in diameter with a projection at the upper end for insertion into the movable rod. The lower end is flat)
Movable Rod: carries an indicator which moves over a graduated scale attached to the frame.
Graduated Scale: 40mm in length and division of 1mm.
Vicat mould: Internal diameter of 60mm +- 0.5mm at the top, 70mm +- 0.5mm at the bottom, 40mm +-0.5mm height.
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