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EMERGING TRENDS IN CIVIL ENGINEERING

EMERGING TRENDS IN CIVIL ENGINEERING BY : JATIN ARORA, ANUJ ARORA, AKSHAY RUHIL RAHUL CHHOKAR.

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EMERGING TRENDS IN CIVIL ENGINEERING

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  1. EMERGING TRENDS IN CIVIL ENGINEERING BY : JATIN ARORA, ANUJ ARORA, AKSHAY RUHIL RAHUL CHHOKAR

  2. INTRODUCTION TO NDT’S ON STRUCTURES

  3. WHAT IS NDT??? NDT-NONDESTRUCTIVE TEST: Detect Defects , Dimensions etc. without Damaging Material.

  4. TESTS ON STRUCTRES

  5. NDT Advantages

  6. NDT Disadvantages

  7. Typical Conditions to Verify

  8. METHODS FOR NDT ON STRUCTURES:

  9. Impact-Echo Method It is a technique used for flaw detection in concrete surface.

  10. Impact-Echo • Based upon evaluation of stress waves generated by an elastic impact on a concrete surface • Originally developed at Cornell University and NIST by M. Sansalone and N. Carino P – Compression waves R - Rayleigh waves S - Shear waves

  11. Impact-Echo Propagating P-waves generated by impact event. Multiply-reflected waves are detected by surface sensor. Reflected waves set up a resonance condition having a characteristic frequency Analogous to a bell’s tone

  12. Impact-Echo • Effective in determining thickness of slabs and depth of flaws in plate structures • Does not work on beams & columns

  13. IMPACT ECHO • Applications • Thickness of members – d,b • Location of internal defects • Voids / delaminations • Repair quality assurance • Internal damage • ASR / DEF / ACR

  14. IMPACT ECHO • Summary • Requires significant experience • Powerful method for flaw detection • Applications to quality control • Verification of results is critical

  15. REBOUND HAMMER TEST OBJECTIVE : Determine the Compressive Strength of concrete.

  16. WORKING OF SRH

  17. Rebound value V/S Compressive Strength

  18. Advantages & Disadvantages • Easy to Handle • Quick • Inexpensive • Used only on Smooth surfaces • Moisture Conditions • Age of Specimen

  19. COVER METER TESTING • OBJECTIVE : Determine Nominal cover.

  20. PRINCIPLE • Works on Electromagnetic Pulse Induction method

  21. HOW IT WORKS???

  22. ADVANTAGES & DISADVANTAGES • High Accuracy • Economical • Not Influenced by Moisture • Limited Detection Range • Spacing depends on Cover depth.

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