CONSISTENCY
The basic aim is to find out the water content required to produce a cement paste of standard consistency as specified by the IS: 4031 (Part 4) – 1988. The principle is that standard consistency of cement is that consistency at which the Vicat plunger penetrates to a point 5-7mm from the bottom of Vicat mould.
Apparatus – Vicat apparatus conforming to IS: 5513 – 1976, Balance, whose permissible variation at a load of 1000g should be +1.0g, Gauging trowel conforming to IS: 10086 – 1982.
Procedure to determine consistency of cement
i) Weigh approximately 400g of cement and mix it with a weighed quantity of water. The time of gauging should be between 3 to 5 minutes.
ii) Fill the Vicat mould with paste and level it with a trowel.
iii) Lower the plunger gently till it touches the cement surface.
iv) Release the plunger allowing it to sink into the paste.
v) Note the reading on the gauge.
vi) Repeat the above procedure taking fresh samples of cement and different quantities of water until the reading on the gauge is 5 to 7mm.
Reporting of Results
Express the amount of water as a percentage of the weight of dry cement to the first place of decimal.
If you have a query, you can ask a question here.
what is the best water cement ratio for consistency of cement
.40 to .6o w/c ratio.
What is the standard consistency limit of cement?
its depends on quality of cement.
however,34% w\c ratio considered to be the best one.!
why 400gm of cement….???
we did with 300gm of cement in the collage!!
what is the use of consistency of cement
Consistency is the water content required for the 5 to 7 mm penetration of vicat plunger
it gives the approximate volume of vicat mould used for the test..
the depth of punger is same on intial setting time & consistency test but the diff is dia of pungar & % of water
with finer cement particles,wold more or less water be required to achieve the normal consistency ?
when we get the results of the tested samples should we go back to Table 1 C494/CC 494M-08a?? if not which reference should we go back to it after getting the results to know the type of the admixture??
I wan the material for civil syllabus. can any one send it?
why penitration value should be between 5-7mm only
How can we know that the paste gives the best consistency between 5 to 7mm penetration of plunger.
why we are geting 85%water for initial setting time, Why do not get 84% Or 86% Etc.
Why was the limit fixed for 5 to 7 mm penetration from bottom????
What is vicat plunger size? (Diameter and length)
dia 10 mm and 40 to 50 mm depth
Vicat plunger weight – 300gm,dia-10mm,length 50mm
What is the practical need of consistency test?
Interesting
very nice explanation sir