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What Is Consistency of Cement | What Is Initial Setting Time of Cement | What Is Final  Setting Time of Cement

Consistence of cement

Important Point

  • What Is Consistency of Cement?
  • What Is Initial Setting Time of Cement?
    • Normally Initial Setting Time :
  • What Is Final  Setting Time of Cement?
      • Also Read : PROCEDURE FOR RCC CONCRETE
  • Consistency Test of Cement
      • #a. Vicat’s Apparatus
      • #b. Plunger
      • #c. Balance.
      • #d. Measuring cylinder
      • #e. Non-Porous Plate
        • #a. Cement
    • Procedure for Consistency Test of Cement :
    • Results of Consistency Test of Cement: 
  • Sample Excel File  Consistency, initial & Final setting of cement
    • Calculation for Consistency Test of Cement:
    • Consistency of Cement
    • What Is Consistency of Cement
    • Standard Consistency of Cement
    • Setting Time of Cement
    • Final Setting Time of Cement
    • Setting Time Test of Cement
    • Initial and Final Setting Time of Cement Test
    • Consistency of Cement Meaning

What Is Consistency of Cement?

Any Cement paste requirement of minimum water in cement paste for initiate the chemical reaction. This chemical reaction call the consistency of cement. This method call consistency fo cement test. 

Relevant is code: IS code 4031 part 4 -Consistency of  Standard Cement past 

What Is Initial Setting Time of Cement?

Initial setting time of cement: Casting cement past in any mold without losing strength & Shape. This working prosses time call initial setting time of cement.

Also Read : CORE CUTTER METHOD

Determination of Initial Setting Time: from IS Code 4031 part 5, page no 2, cl 5.2

Place the test block confined in the mold and resting on the non-porous plate, under the rod bearing the needle ( C ); lower the needle gently until it comes in contact with the surface of the text block and quickly releases. From IS Code 4031 part 5

Allowing it to penetrate into the test block. In. The beginning, the needle will completely pierce the test block.

Repeat this procedure until the needle, when brought in contact with the test block and released as described above, fails to penetrate the block beyond 5.0 ± 0.5 mm measured from the bottom of the mold.

The period elapsing between the time when water is added to the cement and the time at which the needle fails to pierce the test block to a point 5.0 ± 0.5 mm measured from the bottom of the mold shall be the initial setting time.From IS Code 4031 part 5

Relevant is code: IS code 4031 part 5  Initial Setting time of Cement.

Normally Initial Setting Time :

O.P.C (Ordinary Portland Cement) 30 min.Initial Setting time of Cement
Rapid Cement 5 min Initial Setting time of Cement

Also Read :LAB TEST ON AGGREGATES AT SITE

What Is Final  Setting Time of Cement?

Any cement paste stating time of Cement paste is loose cement past to going hard shape of cement pest. All complete prosses of Cement Harding final time call final setting time of cement.

Determination of Final Setting Time: from IS Code 4031 part 5, page no 2, cl 5.3

Replace the needle ( C ) of the Vicat apparatus by the needle with an annular attachment ( F ). The cement shall be considered as finally set whenFrom IS Code 4031 part 5

Upon applying the needle gently to the surface of the text test block, the needle makes an impression thereon, while the attachment fails to do so.From IS Code 4031 part 5

The period elapsing between the time when water is added to the cement and the time at which the needle makes an impression on the surface of test block while the attachment fails to do so shall be the final setting time.

In the event of a scum forming on the surface of the test block, use the underside of the block for the determination

Relevant is code: IS code 4031 part 5  Final Setting time of Cement.

Also Read : PROCEDURE FOR RCC CONCRETE

Consistency Test of Cement

Aim for Consistency Test of Cement:

To determine the standard consistency of test of Cement

Scope for Consistency Test of Cement:

This procedure covers all relative activity for the project site.

Apparatus of Consistency Test of Cement:

#a. Vicat’s Apparatus

Vicat apparatus conforming from IS: 5513-1976

Vic aprts

#b. Plunger

#c. Balance.

#d. Measuring cylinder

#e. Non-Porous Plate

 

Sample:

#a. Cement

Also read: SOUNDNESS OF CEMENT TEST

Procedure for Consistency Test of Cement :

  1. Take about 500 gms cement and prepare a paste with a weight quantity of water (say 24 percent by weight of cement) for the first trial.
  2. The paste must be made in a conventional manner and filled into the Vicat mold within 3-5 minutes.
  3. After complete filling, the mold shakes the mold to expel air.
  4. 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.
  5. Take the reading this reading note down the depth of penetration of the plunger.
  6. Conduct a 2nd trial (say with 25 percent of water) and find out the depth of penetration of plunger. Similarly,
  7. Conduct trials with higher water/cement ratio till such time of plunger penetrates a depth of 33-35 mm from the top.
  8. That particular percentage of water maximum allows the plunger to percentage only to a depth 33-35mm from the top is known as the %(percentage) of the water required to produce the cement paste of standard consistency.
  9. The test is expected required to be conducted at a constant temperature (27°± 2°) C & constant humidity (90%)

Results of Consistency Test of Cement: 

Express the amount of water as a % by weight of the dry cement

Also read : IS CODE FOR CIVIL ENGINEER [Q&A]

Sample Excel File  Consistency, initial & Final setting of cement

Consistency

Calculation for Consistency Test of Cement:

Express the amount of water as a percentage by mass of the dry cement to the first place of decimal.


Short Note

Consistency of Cement

The standard consistency of cement is that consistency, which permits the Vicat plunger to penetrate to a point 5 to 7mm from the bottom of the Vicat mold when tested. The procedure to determine the quantity of water required to produce a cement paste of standard consistency is described below.

What Is Consistency of Cement

The consistency of cement paste is defined as the percentage of water requirement of cement paste at which the viscosity of paste in such a way that it determines the amount of water needed to make a paste. It is necessary to determine consistency because the amount of water affects the setting time of the cement.

Standard Consistency of Cement

The Standard or Normal consistency for Ordinary Portland cement varies between 25-35%. To prepare a mix of cement paste of Standard consistency 25-35% of water is added to the cement. To explain in detail Let us assume a standard consistency is 30%. Take 400g of Cement for this quantity, Add 30% of Water.

Setting Time of Cement

The time at which cement completely loses its plasticity and became hard is a final setting time of cement. The time taken by cement to gain its entire strength is a Final setting time of cement. For Ordinary Portland Cement, The Final Setting Time is 600 minutes (10hrs).

Final Setting Time of Cement

The time at which cement completely loses its plasticity and became hard is a final setting time of cement. The time taken by cement to gain its entire strength is a Final setting time of cement. For Ordinary Portland Cement, The Final Setting Time is 600 minutes (10hrs).

Setting Time Test of Cement

Record the period elapsed between the time of adding water to the cement to the time when the needle fails to pierce the mold by 5 + 0.5mm as the initial setting time. Final Setting Time

  • Replace the needle of the Vicat apparatus by needle with an annular ring
  • Lower the needle and quickly release.

Initial and Final Setting Time of Cement Test

The initial setting time is the exact moment when the concrete starts to harden. In theory, this time starts as soon as the water is added to the cement. The final setting time is the moment the concrete has hardened enough so that a five-millimetre square needle no longer penetrates the surface.

Consistency of Cement Meaning

The consistency of cement paste is defined as the percentage of water requirement of cement paste at which the viscosity of paste in such a way that it determines the amount of water needed to make a paste. It is necessary to determine consistency because the amount of water affects the setting time of the cement.

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By Krunal Rajput

About Krunal Rajput

Hey, I am Krunal Rajput. The Man Behind CivilJungle. I started this site to spread knowledge about Civil Engineering. I am a Degree Holder in Civil Engineering.

You can find him on Facebook, Twitter, Tumblr, Instagram and Google News.

Comments

  1. Pankj says

    4th December 2018 at 7:42 pm

    HI
    Nice articular

    Reply
    • Krunal Rajput says

      16th January 2020 at 10:06 am

      Thanks, Pankaj

      Reply
  2. Kavya says

    16th November 2020 at 11:21 am

    Initial and Final Setting Time of Cement

    The initial setting time is the exact moment when the concrete starts to harden. In theory, this time starts as soon as the water is added to the cement. The final setting time is the moment the concrete has hardened enough so that a five-millimetre square needle no longer penetrates the surface.

    Reply
    • Krunal Rajput says

      17th November 2020 at 12:57 pm

      Thanks, dear for information

      Reply

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