Cement paste is nominal consistency defined as percentage of water by weight of cement which produces a consistency which permits a plunger of 10 mm dia to penetrate up to a depth of 5 mm to 7 mm above the bottom of Vicatâs Mould.
Before performing the test for initial setting time, final setting time, compressive strength tensile strength and soundness of cement etc. it is necessary to fix the quality of water to be mixed to prepare a paste of cement of standard consistency in each case. The quality of water to be added in each of the above mentioned experiment bears a definite relation with the percentage of water of standard consistency. This experiment is intended to find out for given cement, the quality of water to be mixed to give a paste of standard consistency.
Percentage of water in the cement paste âPâ for standard consistency will vary from cement to cement and from batch to batch of the same cement, and the quantities of water used in the other tests will vary accordingly. Following are the quantities of water required for various tests:
(a) Le Chatelier method
(b) Autoclave method
Aim: To determine standard consistency of Cement.
Significance: It is a parameter which is used to find out initial & final setting time and soundness of cement. This gives percentage of water required to produce a cement paste of standard consistency.
Definition: The area of cement particles of particular cement weight.
|Weight of Cement||Percentage of water by Weight of Cement||Penetration of Plunger,mm|
|400 gm||& so on|
|Range||General range of standard Consistency is 25% to 35%|
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