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

How to calculate strength of concrete in rebound hammer test

Home/ Questions/Q 38059
Next
In Process

Do you need to remove the ads? Join now!

Asked: September 19, 20202020-09-19T23:04:34-07:00 2020-09-19T23:04:34-07:00In: Construction
Revansidda B Hagargi
Revansidda B Hagargi

Revansidda B Hagargi

  • 1 Question
  • 0 Answers
  • 0 Best Answers
  • 5 Points
View Profile
Revansidda B Hagargi User
  1.  
  • 0
  • 1 1 Answer
  • 10,862 Views
  • 0 Followers
  • 0
  • Share
    Share
    • Share on Facebook
    • Share on Twitter
    • Share on LinkedIn
    • Share on WhatsApp

1 Answer

  • Voted
  • Oldest
  • Recent
  1. aviratdhodare

    aviratdhodare

    • 37 Questions
    • 252 Answers
    • 0 Best Answers
    • 480 Points
    View Profile
    aviratdhodare
    2020-09-22T13:50:16-07:00Added an answer on September 22, 2020 at 1:50 pm

    The rebound hammer test is a non-destructive test for the strength of concrete for field testing of concrete.

    As per the Indian code IS: 13311(2)-1992, the rebound hammer test has the following objectives:

    1. To determine the compressive strength of the concrete by relating the rebound index and the compressive strength
    2. To assess the uniformity of the concrete
    3. To assess the quality of the concrete based on the standard specifications
    4. To relate one concrete element with other in terms of quality

    The instrument can be used on both horizontal and vertical surfaces. The main point to be noted is that the graph had to be read appropriately. These days, the hammer is equipped with a digital scale to make life easier.

    The IS: 13311(2)-1992 elaborates the procedure in a more detailed manner, making it easier for even beginners to understand the concept.

    The point of impact should be at least 20 mm away from any edge or shape discontinuity. For taking a measurement, the rebound hammer should be held at right angles to the surface of the concrete member.

    The apparatus is placed on the spot where the test is desired. The hammer is allowed to drop freely. After it strikes the concrete surface it rebounds back. The raise of the rebound is recorded. This test is repeated at different locations and the rebound value is recorded.

    The compressive value of concrete is obtained by doing a cube test of the test cube of the batch of concrete on which the rebound test is conducted. The value of rebound and compressive strength of concrete is compared and the value of compression is adjudged from the values of compression test and rebound values.

    Around each point of observation, six readings of rebound indices are taken 2nd average of these readings after deleting outliers as per IS 8900: 1978 becomes the rebound index for the point of observation. ( This outlaying is a calculation based method, can be discussed on one’s interest).

    Now, we will calculate comp. Strength from rebound number. There are three positions of taking reading

    1. Vertical Downward:- Weight of Hammer is increasing stress on spring of hammer
    2. Vertical Upward:- Weight of hammer is decreasing the stress on spring of hammer
    3. Horizontally :- Weight of hammer have no effect on spring.

    This is why, there are three graphs in Rebound Number-Compressive Strength graph of Rebound Hammer.

    You will have to calculate the strength from the graph as per position of Rebound Hammer.

    For Example,

    For Vertical Upward position of Hammer

    If 15 Rebound number readings are

    48,42,43,43,44,44,45,45,45,45,46,47,48,50

    , as per IS:8900, Clause 5.1.1(TESTS FOR TWO OR MORE OUTLIERS , AT LEAST ONE OUTLIER AT EACH END), 42 and 50 are Outlaying values.

    Removing those, Average Rebound number is 45.27

    From the graph( fro Vertical Upward) , Compressive Strength Will be 40.54 Mpa

    • 33
    • 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

    The Yellow Standard: Why Construction Equipment is Always Yellow

  • constructororghq

    Why Insuring Your Construction Projects Is A Must

  • constructororghq

    How Green Building Practices Lead to Lower Carbon Dioxide Levels

  • constructororghq

    How to plan your budget for home renovation

  • constructororghq

    How to Change Out a Countertop in Less Than a Day

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.