CIVIL READ

Menu
  • Home
  • Structure
  • Tech
  • Notes
  • Must have books
  • JOBS
  • [FORUM]
  • Contact Us
    • Advertise with us
    • About Us
    • Contact Us
    • Follow us
    • Terms of Service
    • Privacy Policy
STRUCTURE

Initial and Final Setting time of Cement

Contents

  • Setting time of cement:
  • Initial Setting time of Cement:-
  • Final setting time of Cement:-
  • Significance of calculating Initial and final setting time of cement:-
  • Factors that affect initial and final setting time of cement:-
  • Calculation of Initial and Final Setting time of Cement:-
  • Apparatus Required:-
  • Procedure:-
  • User Review

Setting time of cement:

When cement is mixed with water, it hydrates and makes cement paste. This paste can be moulded into any desired shape due to its plasticity. Within this time cement continues with reacting water and slowly cement starts losing its plasticity and set harden. This complete cycle is called Setting time of cement.

Initial Setting time of Cement:-

The time to which cement can be moulded in any desired shape without losing it strength is called Initial setting time of cement

Or

The time at which cement starts hardens and completely loses its plasticity is called Initial setting time of cement.

Or

The time available for mixing the cement and placing it in position is an Initial setting time of cement. If delayed further, cement loses its strength.

For Ordinary Portland Cement, The initial Setting Time is 30 minutes.

Final setting time of Cement:-

The time at which cement completely loses its plasticity and became hard is a final setting time of cement.

Or

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).

initial and final setting time of cement

Significance of calculating Initial and final setting time of cement:-

Well, After mixing cement with water, it takes time to place the cement paste in position,  initial setting time possess a primary role in strength & it is mandated that cement paste or concrete is placed in position before it crosses initial setting time. i.e.,30mins. And it shouldn’t be disturbed until it completes Final setting time i.e., 600mins for Ordinary Portland Cement.

Also Read:-How to calculate Normal or standard consistency of cement

Factors that affect initial and final setting time of cement:-

The fineness of cement, the presence of salts in sand, atmospheric conditions. For example, cement requires a temperature of 27°c to complete Hydration, during winters the climate is low which stops the hydration and takes a longer time to set harden.

Calculation of Initial and Final Setting time of Cement:-

As Per  IS: 4031 (Part 5) – 1988.  Initial and final setting time of cement is calculated using VICAT apparatus conforming to IS: 5513 – 1976,

Apparatus Required:-

Weighing balance of 1000g with accuracy 1g and Measuring cylinder of 200ml, VICAT apparatus, VICAT Mould, Glass plate, the plunger of 10mm dia and Hand Trowel, stop watch

Initial and Final Setting time of Cement

Procedure:-

  1. Take 400g of cement and place it in a bowl or tray.
  2. Now add water of Start the stopwatch at the moment water is added to the cement. Water of quantity 0.85P.times (Where P is the Standard consistency of cement) is considered.
  3. Now fill the mix in Vicat mould. If any excessive paste remained on Vicat mould is taken off by using a trowel.
  4. Then, place the VICAT mould on non porous plate (Glass plate) and see that the plunger should touch the surface of VICAT mould gently.
  5. Release the Plunger and allow it to sink into the test mould.
  6. Note down the penetration of the plunger from the bottom of mould indicated on the scale.
  7. Repeat the same experiment at different positions on the mould until the plunger should stop penetrating 5 from the bottom of the mould.

The time period elapsed between the moment water is added to the cement and the time, the needle fails to penetrate the mould of 5mm when measured from the bottom of the mould, is the initial setting time of cement.

Needle used for finding Initial setting time of cement

Now replace the needle (plunger) by the one with an annular attachment. The cement is assmed as finally set When, upon applying the needle gently to the surface of the test mould, the needle makes an impression therein, while the attachment fails to do so. The time period between the moment water is added to the cement and the time at which needle makes an impression on the surface of the mould, while the attachment fails to do so, is the final setting time of cement.

 

How to find quality of sand on site?

Segregation and Bleeding in concrete

 LIKE US ON FACEBOOK

For Instant updates Join our Whatsapp Broadcast. Save our Whatsapp contact
+91-9700078271 as Civilread and Send us a message “JOIN”

Never Miss an update Click on “Allow US” and make us allow or Click on Red notification bell at bottom right and allow notifications.
Stay tuned!
Civil Read Wishes you ALL the BEST for your future.

Sending
User Review
0 (0 votes)
Prev Article
Next Article

About The Author

Krishna

Founder & Admin of civilread.com, I am a civil engineer working in Ultratech Cement Ltd. With a good subject knowledge in civil engg i have started this blog to share valuable information to fellow civil engineers. You can also follow me on fb and twitter by clicking below

4 Comments

  1. Rs sundaram

    Use full informations

    November 7, 2017
  2. N A Sundaram

    What is the differsmce between ideal cement mix and masonry cement mix.

    February 15, 2018
  3. rs sundaram

    how to decrease initial setting time of cement

    March 28, 2018
    • Santanu Acharya

      To decrease setting time u have to use accelerator i.e Cacl2

      May 23, 2018

Leave a Reply

Cancel reply

Join us

Search Here

Recent Posts

  • shuttering calculation for staircase
    Shuttering required for the construction of staircase
    February 8, 2019 0
  • Calculation of Volume of Concrete required for …
    February 7, 2019 0
  • Tyler G. Hicks P.E.
    Civil Engineering Formulas for competitive exams free …
    January 18, 2019 0
  • Bar bending schedule BBS
    Bar Bending Schedule [BBS] Estimate of Steel …
    January 12, 2019 70
  • GATE CIVIL ENGINEERING SOLVED PAPERS 2000 - 2018
    Download Civil Engineering GATE 2000 to 2018 …
    December 28, 2018 0
  • Cutting Length of Stirrups
    How to calculate Cutting length of Stirrups …
    December 23, 2018 1

CIVIL READ

Enter your email to receive an exclusive content right in your inbox Don't worry we never spam

 

Having Queries? Need Help?

or

Are You an expert in Civil Engineering?

Join Civilread forum

Important Topics

Bar Bending Schedule concrete jobs Quantity surveying reinforcement Tests on cement Tests on concrete workability of concrete test
Copyright © 2019 CIVIL READ
About CivilRead | Contact us | Advertise | Privacy Policy | Terms of Service | Follow us