Join

Join TheConstructor to ask questions, answer questions, write articles, and connect with other people. When you join you get additional benefits.

Have an account? Log in
Continue with Facebook
Continue with Google
or use


Have an account? Log in Now

Log in

Log in to TheConstructor to ask questions, answer people’s questions, write articles & connect with other people. When you join you get additional benefits.

Join Here

Join for free or log in to continue reading...

Continue with Facebook
Continue with Google
or use


Forgot Password?

Don't have account, Join Here

Forgot Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

Have an account? Log in Now

Sorry, you do not have permission to ask a question, You must log in to ask a question. Join now!

Join for free or log in to continue reading...

Continue with Facebook
Continue with Google
or use


Forgot Password?

Don't have account, Join Here
Join now!
The Constructor Logo The Constructor Logo
Log inJoin

The Constructor

The Constructor Navigation

  • Articles
    • Recent Articles
    • Popular Articles
    • Write for us
  • Community
  • Categories
    • How To Guide
      • Material Testing Guide
    • Concrete
    • Building
      • Brick Masonry
      • Building Materials
      • Building Tips
    • Construction
      • Equipments
      • Management
    • Digital Construction
    • Geotechnical
      • Foundation
  • Case Studies
Search
Ask A Question

Mobile menu

Close
Ask a Question
  • Questions
  • Ask Questions
  • Write for us
  • Artificial Intelligence
  • Sustainability
  • Building
    • Brick Masonry
    • Building Materials
    • Building Tips
    • Formwork/Shuttering
  • Concrete
    • Concrete Admixtures
    • Cement
    • Concrete Cracks
    • Concrete Properties
  • Construction
    • Construction Equipments
    • Construction Management
    • Construction Project
    • Estimating & Costing
  • How To Guide
    • Material Estimation
    • Repair/Protection Guide
    • Material Testing Guide
    • Mix Design Guide
    • Rate Analysis
  • Geotechnical
    • Foundation Engineering
    • Ground Improvement
  • Structural Engineering
    • Strengthening of Structure
    • Structual Inspection
    • Structural Detailing
  • Surveying
  • Tips

Why are 6 cubes cast for testing the Compressive Strength?

Home/ Questions/Q 46641
Next
Answered

Do you need to remove the ads? Join now!

Asked: July 22, 20202020-07-22T18:51:17-07:00 2020-07-22T18:51:17-07:00In: Concrete
Tips_and_tricks
Tips_and_tricks

Tips_and_tricks

  • 13 Questions
  • 15 Answers
  • 1 Best Answer
  • 685 Points
View Profile
Tips_and_tricks Learner

Why are 6 cubes cast for testing the Compressive Strength?

  • 0
  • 4 4 Answers
  • 17,687 Views
  • 0 Followers
  • 0
  • Share
    Share
    • Share on Facebook
    • Share on Twitter
    • Share on LinkedIn
    • Share on WhatsApp

4 Answers

  • Voted
  • Oldest
  • Recent
  1. nikeetasharma

    nikeetasharma

    • 23 Questions
    • 303 Answers
    • 0 Best Answers
    • 2,680 Points
    View Profile
    nikeetasharma Guru
    2020-12-18T15:04:04-08:00Added an answer on December 18, 2020 at 3:04 pm

    6 cubes are casted for testing the compressive strength because first 3 cubes are tested for 7 days and another for 28 days. The cubes tested for 7 days should gain 70% of strength and cubes tested for 28 days should gain 99% of strength.

    • 5
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  2. INDER KUMAR YADAV

    INDER KUMAR YADAV

    • 0 Questions
    • 14 Answers
    • 1 Best Answer
    • 562 Points
    View Profile
    INDER KUMAR YADAV Learner
    2020-07-23T13:27:00-07:00Added an answer on July 23, 2020 at 1:27 pm

    6 cubes are casted for checking the compressive strength of concrete as it is given in the code and as,

    In Indian standard, there are two different IS code which is defining concrete sampling frequency, those are IS 456 and IS 4926.

    As per is 456 Clause 15.2.2, Sampling frequency is

    0–5m³ – 1 set

    6–15m³- 2 set

    16–30m³ 3 set

    30–50 m³ 4 set and +1 set for every 50m³ concrete.

    This cubes are to be tested in 28 days.

    Additional samples should be casted if required for 1 day, 3 days, 7 days testing done.

    As per IS 4926 Clause 6.3.2,

    One set of samples to be casted in every 50m³ concrete and additional samples (1 day, 3 days,7 days etc) to be casted if required.

    Here, 1 set sample means 3 nos of cubes.

    Whatever, the sampling frequency and number of samples to be cast to be fixed mutually by both vendor and client

    • 6
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  3. Kuldeep Singh

    Kuldeep Singh

    • 1 Question
    • 110 Answers
    • 10 Best Answers
    • 652 Points
    View Profile
    Best Answer
    Kuldeep Singh Learner
    2020-07-23T13:21:53-07:00Added an answer on July 23, 2020 at 1:21 pm

    Whenever testing for cube strength, it is always advised to make and test three specimens from the same mix. This is done to reduce or average out the error due to manually introduced differences in the three cubes.

    Now, concrete and cement are always tested at both 7 days and 28 days for compressive strength. The compressive strength at seven days is known to be 65% of the final (28 days) strength. This double testing is done so that if the seven days strength is found inappropriate, the cubes may be straight away discarded to save 21 days’ time because the 28-day strength will also probably be below par. Now, a time even earlier than seven days is not chosen because, at that age, strength gain is very steep, and there’s a higher margin of error. Also, seven days is a round figure.

    For both the tests, 3 cubes each are employed. Hence, a total of 6 cubes go through the compression test.

    • 3
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  4. CB Sowmya

    CB Sowmya

    • 3 Questions
    • 53 Answers
    • 4 Best Answers
    • 5 Points
    View Profile
    CB Sowmya User
    2020-07-23T13:15:03-07:00Added an answer on July 23, 2020 at 1:15 pm

    Generally,

    Three cubes are tested for seven days of strength. The cube should have achieved at least 70% of its strength on the 7th day.

    The other three cubes are tested for 28 days strength. The cube should have achieved at least 99% of its strength on the 28th day.

    • 4
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp

You must log in to add an answer.

Join for free or log in to continue reading...

Continue with Facebook
Continue with Google
or use


Forgot Password?

Need An Account, Join Here

Sidebar

Popular Articles

  • Gopal Mishra

    Types of Foundation for Buildings and their Uses [PDF]

  • Gopal Mishra

    Compressive Strength of Concrete -Cube Test [PDF], Procedure, Results

  • Sadanandam Anupoju

    16 Types of Heavy Equipment Used in Construction

  • Gopal Mishra

    Calculate Quantities of Materials for Concrete -Cement, Sand, Aggregates

  • Padmanabhan G

    Methods of Rainwater Harvesting [PDF]: Components, Transportation, and Storage

Recent Articles

  • constructororghq

    Hard Hats on the Job: Why Construction Workers Wear Them

  • constructororghq

    The Sky-High Science of Skyscraper Construction

  • constructororghq

    Home Decor Trend Alert - Top Wall Texture Ideas

  • constructororghq

    Flush Doors: A Practical And Stylish Choice For Your Home

  • constructororghq

    Maximizing Your Space with a Sloping Roof

Recent Questions

  • jkshah

    Which is the code used for the design of the RCC Bridge?

    • 1 Answer
  • AKM59

    What is the tolerance for compression test results of concrete, according to the standards?

    • 1 Answer
  • Gopal Mishra

    What must be the maximum dry density of Granular Sub Base & Wet Mix Macadam used ...

    • 1 Answer
  • Gopal Mishra

    What is the Safe Bearing Capacity values for Different Soils?

    • 1 Answer
  • Gopal Mishra

    What are the different types of handrails used in bridges?

    • 1 Answer

Explore

  • Questions
  • Ask Questions
  • Write for us
  • Artificial Intelligence
  • Sustainability
  • Building
    • Brick Masonry
    • Building Materials
    • Building Tips
    • Formwork/Shuttering
  • Concrete
    • Concrete Admixtures
    • Cement
    • Concrete Cracks
    • Concrete Properties
  • Construction
    • Construction Equipments
    • Construction Management
    • Construction Project
    • Estimating & Costing
  • How To Guide
    • Material Estimation
    • Repair/Protection Guide
    • Material Testing Guide
    • Mix Design Guide
    • Rate Analysis
  • Geotechnical
    • Foundation Engineering
    • Ground Improvement
  • Structural Engineering
    • Strengthening of Structure
    • Structual Inspection
    • Structural Detailing
  • Surveying
  • Tips

Footer

  • Home
  • About Us
  • Contact Us
  • Privacy Policy
  • Terms & Conditions
  • Ask Questions
  • Write for us
  • Popular Questions
  • Facebook
  • Instagram
  • Twitter
  • Telegram

© 2009-2021 The Constructor. All Rights Reserved.