CONSISTENCY OF CEMENT

CONSISTENCY OF CEMENT

(IS: 269 - 1989 and IS: 4031 - 1988 (Part 4))

 

AIM:   To determine the quantity of water required to produce a cement paste of standard

 consistency.

 

APPARATUS:

Vicat apparatus (conforming to IS: 5513 - 1976) with plunger (10 mm in diameter) balance, weights, gauging trowel.

 

INTRODUCTION:

The consistency test is defined to find out the consistency that will allow penetrating plunger points from 5 mm to 7 mm from the lower level of Vicat mold. With the help of this test results, we can easily find the initial setting time, final setting time, soundness test, compressive strength test, that will you water required to mix with cement. This test is done with the help of the Vicat apparatus. This apparatus may be two types of manual and digital Vicat apparatus.

PROCEDURE:

 

1.         Prepare a paste of weighed quantity of cement (300 grams) with a weighed quantity of potable or distilled water, starting with 26% water of 300g of cement.

        Take a sample of cement weight 300 gm in a pan. by IS code we have to mix 25% water by weighing of cement we can use

2.         Take care that the time of gauging is not less than 3 minutes, not more than 5 minutes and the gauging shall be completed before setting occurs.

3.         The gauging time shall be counted from the time of adding the water to the dry cement until commencing to fill the mould.

4.         Fill the Vicat mould with this paste, the mould resting upon a non porous plate.

5.         After completely filling the mould, trim off the surface of the paste, making it in level

with the top of the mould. The mould may slightly be shaken to expel the air.

6.         Place the test block with the mould, together with the non-porous resting plate, under the rod bearing the plunger (10mm diameter), lower the plunger gently to touch the surface of the test block and quickly release, allowing it to penetrate into the paste.

7.         This operation shall be carried out immediately after filling the mould.

8.      Prepare trial pastes with varying percentages of water and test as described above until the amount of water necessary for making the standard consistency as defined above is obtained.

9.         Express the amount of water as a percentage by weight of the dry cement.

 

PRECAUTIONS: 

Clean machines will be utilized for measuring. In filling the mould of the operator hands and the blade of the measuring gauge will alone be utilized. The temperature of cement, water and that of test room, when the above activities are being performed, will be 27 + 2C. For every reiteration of the analysis new cement is to be taken.

 

OBSERVATIONS:

S. No	Weight of cement  taken in gms (a)	Weight of water taken in gms (b)	Plunger penetration (mm)	Time Taken	Consistency of cement in % by weight b/a * 100
1.
2.
3.

 

RESULT: Normal consistency for the given sample of cement is =

 

 

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