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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.

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slide1
EMERGING TRENDS IN CIVIL ENGINEERING

BY : JATIN ARORA,

ANUJ ARORA,

AKSHAY RUHIL

RAHUL CHHOKAR

introduction to

INTRODUCTION TO

NDT’S ON

STRUCTURES

what is ndt

WHAT IS NDT???

NDT-NONDESTRUCTIVE TEST:

Detect Defects , Dimensions etc. without Damaging Material.

impact echo method
Impact-Echo Method

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

impact echo
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 echo1
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 echo2
Impact-Echo
  • Effective in determining thickness of slabs and depth of flaws in plate structures
  • Does not work on beams & columns
impact echo3
IMPACT ECHO
  • Applications
    • Thickness of members – d,b
    • Location of internal defects
      • Voids / delaminations
    • Repair quality assurance
    • Internal damage
      • ASR / DEF / ACR
impact echo4
IMPACT ECHO
  • Summary
    • Requires significant experience
    • Powerful method for flaw detection
    • Applications to quality control
    • Verification of results is critical
rebound hammer test
REBOUND HAMMER TEST

OBJECTIVE : Determine the Compressive

Strength of concrete.

advantages disadvantages
Advantages & Disadvantages
  • Easy to Handle
  • Quick
  • Inexpensive
  • Used only on Smooth surfaces
  • Moisture Conditions
  • Age of Specimen
cover meter testing
COVER METER TESTING
  • OBJECTIVE : Determine Nominal cover.
principle
PRINCIPLE
  • Works on Electromagnetic Pulse Induction method
advantages disadvantages1
ADVANTAGES & DISADVANTAGES
  • High Accuracy
  • Economical
  • Not Influenced by Moisture
  • Limited Detection Range
  • Spacing depends on Cover depth.
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