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

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.


Tests on structres

TESTS ON STRUCTRES


Ndt advantages

NDT Advantages


Ndt disadvantages

NDT Disadvantages


Typical conditions to verify

Typical Conditions to Verify


Methods for ndt on structures

METHODS FOR NDT ON STRUCTURES:


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.


Working of srh

WORKING OF SRH


Rebound value v s compressive strength

Rebound value V/S Compressive Strength


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


How it works

HOW IT WORKS???


Advantages disadvantages1

ADVANTAGES & DISADVANTAGES

  • High Accuracy

  • Economical

  • Not Influenced by Moisture

  • Limited Detection Range

  • Spacing depends on Cover depth.


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