Indian Standard IS 16172: 2023 Overview
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Questions and Answers

What is the specified range of stress variation for the cyclic tensile test?

  • 0 percent to 100 percent of fy
  • 10 percent to 80 percent of fy
  • 5 percent to 90 percent of fy (correct)
  • 0 percent to 90 percent of fy

    • Which grade's reinforcement bar yield stress must be considered during the mechanical splice test?

  • Grade specified in Annex D
  • Grade below IS 1786 specifications
  • Any random grade of reinforcement bars
  • Grade of reinforcement bar conforming to IS 1786 (correct)

    • What does not apply to threaded couplers as per the fatigue test requirements?

  • High cycle fatigue requirements (correct)
  • Static tensile strength requirements
  • Cyclic tensile test requirements
  • Low cycle fatigue requirements

    • How is the static tensile strength capacity of a test specimen determined?

    <p>By testing it statically to failure</p> Signup and view all the answers

    What is true about the rib geometry of steel reinforcing bars in relation to mechanical splices?

    <p>It affects the performance of some types of mechanical splices.</p> Signup and view all the answers

    For the cyclic tensile test, how many cycles of stress variation must the mechanical splice withstand?

    <p>100 cycles</p> Signup and view all the answers

    What does the term 'subjecting it to stress cycles' refer to?

    <p>Testing mechanical splices under varying loads</p> Signup and view all the answers

    Which type of fatigue test must all reinforcement couplers satisfy?

    <p>Low cycle fatigue test only</p> Signup and view all the answers

    What change has been made regarding the slip test requirements?

    <p>It has been modified to address swaged coupling sleeves longer than 100 mm.</p> Signup and view all the answers

    What new provision has been added in the static tensile test report?

    <p>Clarity on information to be provided.</p> Signup and view all the answers

    What has been modified concerning sampling frequency and criteria for acceptance tests?

    <p>It has considered industry requests and practical factors.</p> Signup and view all the answers

    What type of guidance is provided concerning mechanical splicing of reinforcing bars?

    <p>Quality control checks during the process.</p> Signup and view all the answers

    What has been suggested for coupler-bar connections in severe environmental conditions?

    <p>Corrosion testing to assess risks.</p> Signup and view all the answers

    Which document contains provisions on splicing of reinforcement bars?

    <p>A standard code of practice for reinforced concrete.</p> Signup and view all the answers

    What aspect concerning the validity period has been modified?

    <p>Clarifies the conditions under which tests remain valid.</p> Signup and view all the answers

    What does the standard primarily cover?

    <p>Requirements specific to reinforcement couplers.</p> Signup and view all the answers

    What is the minimum sufficient free length for the slip test (L3)?

    <p>250 + L</p> Signup and view all the answers

    Which formula is correct for calculating the change in gauge length during the slip test?

    <p>ΔLs = Lg2 - Lg1</p> Signup and view all the answers

    What quality requirement is specified for the extensometer used in slip measurement?

    <p>It must be of Class 1 or better</p> Signup and view all the answers

    What is the preferable type of extensometer for the slip test?

    <p>Three-point type</p> Signup and view all the answers

    What must be done with the gauges after the closure of the jaws of the tensile testing machine?

    <p>They must be set to zero</p> Signup and view all the answers

    What action is recommended if the reinforcing bars inside the fixed coupler are not straight?

    <p>Gas cut the reinforcing bar</p> Signup and view all the answers

    What is the minimum measurement accuracy required for the slip measurement device?

    <p>Not less than 0.01 mm</p> Signup and view all the answers

    What should be done if bolt heads do not shear-off but the recommended torque is achieved?

    <p>Install the coupler</p> Signup and view all the answers

    What is the purpose of the extensometer in the context of the slip test?

    <p>To measure slip accurately</p> Signup and view all the answers

    Which characteristic should the slip measurement device possess?

    <p>It should be rigid and fixed securely</p> Signup and view all the answers

    Which document outlines the installation instructions for the splice methods?

    <p>G-2 to G-5 documentation</p> Signup and view all the answers

    What is required for the temporary supports of elements during installation?

    <p>To remain until minimum grout strength is achieved</p> Signup and view all the answers

    What happens if some bolt heads do not shear-off during installation?

    <p>Installation can proceed if torque is acceptable</p> Signup and view all the answers

    Who is responsible for the main oversight of the Concrete Reinforcement Sectional Committee?

    <p>SHRI G.SHARAN</p> Signup and view all the answers

    Which organization is NOT listed as part of the Concrete Reinforcement Sectional Committee?

    <p>Institute of Structural Engineers</p> Signup and view all the answers

    What is the potential consequence of not following the manufacturer's installation instructions?

    <p>Reduced structural integrity</p> Signup and view all the answers

    Where should the testing equipment be located in relation to the mechanical splice?

    <p>Outside the length of the mechanical splice on both bars</p> Signup and view all the answers

    What should be included in each individual test report for spliced specimens?

    <p>Tensile strength, percentage elongation, and location of failure</p> Signup and view all the answers

    What is the purpose of the tensile test carried out according to IS 1608?

    <p>To determine the tensile strength of the specimen</p> Signup and view all the answers

    How is the percentage elongation at maximum force evaluated?

    <p>According to IS 1608 (Part 1) specifications</p> Signup and view all the answers

    What is the gauge length for extensometers relative to the length L1?

    <p>Between (L1 + 2d) and (L1 + 6d)</p> Signup and view all the answers

    What should be recorded during the tensile strength test?

    <p>The largest tensile strength value among samples</p> Signup and view all the answers

    How is the method of slip across the mechanical splice categorized?

    <p>As a non-destructive testing method</p> Signup and view all the answers

    Which aspect is not required for testing un-spliced specimens?

    <p>Location of failure documentation</p> Signup and view all the answers

    What is the specified yield stress requirement for reinforcement bars according to IS 1786?

    <p>0.2 percent proof stress</p> Signup and view all the answers

    What should happen in case of a failure of a mechanical splice?

    <p>Failure shall occur in the bar outside the length of the splice</p> Signup and view all the answers

    What is required for the quality of threads on threaded couplers?

    <p>Threads must be cleanly formed and free from imperfections</p> Signup and view all the answers

    What is the initial test frequency for verifying thread quality in a coupler?

    <p>1 piece at each production start-up and 5 pieces per hour</p> Signup and view all the answers

    What is the minimum percentage elongation when testing for maximum force?

    <p>The standard requires uniform elongation, but specific values are not given</p> Signup and view all the answers

    What should be ensured about reinforcement couplers during manufacturing?

    <p>They should be finished smooth and free from defects</p> Signup and view all the answers

    In the context of reducing couplers, what must be measured?

    <p>Criteria must be based on the lower size bar</p> Signup and view all the answers

    What indicates a properly calibrated 'GO' and 'NO GO' gauge?

    <p>It verifies the thread quality after manufacturing</p> Signup and view all the answers

    Study Notes

    Indian Standard IS 16172: 2023

    • This standard specifies reinforcement couplers for the mechanical splicing of steel bars in concrete
    • This is the first revision of the standard
    • International Standards referenced include ISO 15835-1: 2018, ISO 15835-2: 2018, and ISO 15835-3: 2018
    • Scope expanded to cover couplers corresponding to all grades covered in IS 1786
    • Definitions of some terms modified for clarity
    • Hybrid couplers, reducer/transition couplers added
    • Provisions on tensile strength, cyclic test, high cycle fatigue test modified
    • Slip test requirements modified to include swaged coupling sleeves, grout/steel-filled coupling sleeves exceeding 100 mm

    Terminology

    • Mechanical Splice: Complete assembly of a coupler and related materials for splicing two bars
    • Reinforcement Coupler: A coupling device (such as a sleeve or threaded coupler) for mechanical splicing of reinforcing bars, transferring axial tensile and compressive forces.
    • Coupler Length: Actual length of the coupler, including any load-transferring parts and locknuts where applicable.
    • Length of mechanical splice: Couplers length plus two times nominal bar diameter at both ends.
    • Slip: Permanent extension of mechanical splice after loading to a specified level
    • Slip Measurement Device: Assembly consisting of an extensometer and any fixing mechanisms for measuring slip.

    Performance Requirements

    • Couplers must meet requirements for static tensile test, slip test, cyclic tensile test, low-cycle fatigue test and (for Class H couplers) high-cycle fatigue test
    • Static tensile strength must meet a minimum of 130% of the specified minimum yield stress (or 0.2% proof stress) of the bar. Failure should occur outside the splice if the strength is less than 130%
    • Percentage elongation at maximum force, measured outside the splice, must be at least 3%

    Classification

    • Couplers classified into Class H and Class L
    • Class H: Meets both low-cycle and high-cycle fatigue tests
    • Class L: Meets only low-cycle fatigue test

    Packing

    • Couplers protected against rust through measures like rust prevention or packing in VCI bags. Stackable wooden boxes used for delivery

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    Indian Standard IS 16172:2023 PDF

    Description

    This quiz covers the key aspects of the Indian Standard IS 16172: 2023 concerning the mechanical splicing of steel reinforcement bars in concrete. It discusses the revisions made, modifications to terminology, and the testing requirements for reinforcement couplers. Expand your understanding of this crucial standard in construction materials.

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