EMERGING TRENDS IN
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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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EMERGING TRENDS IN CIVIL ENGINEERING

BY : JATIN ARORA,

ANUJ ARORA,

AKSHAY RUHIL

RAHUL CHHOKAR


INTRODUCTION TO

NDT’S ON

STRUCTURES


WHAT IS NDT???

NDT-NONDESTRUCTIVE TEST:

Detect Defects , Dimensions etc. without Damaging Material.


TESTS ON STRUCTRES


NDT Advantages


NDT Disadvantages


Typical Conditions to Verify


METHODS FOR NDT ON STRUCTURES:


Impact-Echo Method

It is a technique used for flaw detection in concrete surface.


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


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


Impact-Echo

  • Effective in determining thickness of slabs and depth of flaws in plate structures

  • Does not work on beams & columns


IMPACT ECHO

  • Applications

    • Thickness of members – d,b

    • Location of internal defects

      • Voids / delaminations

    • Repair quality assurance

    • Internal damage

      • ASR / DEF / ACR


IMPACT ECHO

  • Summary

    • Requires significant experience

    • Powerful method for flaw detection

    • Applications to quality control

    • Verification of results is critical


REBOUND HAMMER TEST

OBJECTIVE : Determine the Compressive

Strength of concrete.


WORKING OF SRH


Rebound value V/S Compressive Strength


Advantages & Disadvantages

  • Easy to Handle

  • Quick

  • Inexpensive

  • Used only on Smooth surfaces

  • Moisture Conditions

  • Age of Specimen


COVER METER TESTING

  • OBJECTIVE : Determine Nominal cover.


PRINCIPLE

  • Works on Electromagnetic Pulse Induction method


HOW IT WORKS???


ADVANTAGES & DISADVANTAGES

  • High Accuracy

  • Economical

  • Not Influenced by Moisture

  • Limited Detection Range

  • Spacing depends on Cover depth.


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