DETERMINATION OF CONSISTENCY OF STANDARD CEMENT PASTE
We are know this test different name, ” Consistency test of cement ” , ” Setting time test of cement ” , ” Initial setting time of cement ”
Aim: To determine standard consistency of cement for finding initial & final setting time.
Scope: This procedure covers all relative activity for the project site.
Relevant Is Code : IS 4031
a) Vicat’s apparatus
d) Measuring cylinder
e) Non-porous plate
a) Take about 500 gms of cement and prepare a paste with a weight quantity of water (say 24 percent by weight of cement) for the first trial.
b) The paste must be prepared in a standard manner and filled into the Vicat mould within 3-5 minutes.
c) After complete filling the mould shake the mould to expel air.
d) A standard plunger 10mm diameter, 50mm long is attached and brought down to touch the surface of the paste in the test block & quickly released allowing it to sink into the paste by its own weight.
e) Take the reading by nothing the depth of penetration of the plunger.
f) Conduct a 2nd trial (say with 25 percent of water) and find out the depth of penetration of plunger. Similarly, conduct trials with higher and higher water/cement ratio till such time the plunger penetrates for a depth of 33-35 mm from the top.
g) That particular percentage of water which allows the plunger to percentage only to a depth 33-35mm from the top is knows as the % of water required to produce the cement paste of standard consistency.
h) The test is required to be conducted in a constant temperature (27°± 2°) C & constant humidity (90%)
Express the amount of water as a % by weight of the dry cement
Sample Excel File Consistency, initial & Final setting of cement
|Determination of Consistency, Initial & Final Setting of Cement|
|Type of Cement||Tested as per|
|W / M /Y||Confirmation as per|
|Testing Date||Testing Place|
|Test No.||Weight of Cement (gm)||% of water in Mix||Weight of Water (Gm)||Needle Penetration (MM)||Remarks|
|Standard Consistency of Cement (%)|
|Initial Setting Time (Minute)|
|Final Setting Time (Minute)|
|Remarks ( If Any) –|