n d Tofstructurdases 130202042533 Phpapp01

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BY

M.LAKSHMI SANJANA (3/4-B.ECIVIL)

P.SAI PAVAN REDDY (3/4-B.E

NON DESTRUCTIVE

TESTING OFSTRUCTURES

From

Sri Vasavi Institute of

Engineering

& Technology


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WHAT IS NON DESTRUCTIVE

TESTING?

Non Destructive testing are non invasive

techniues to !eter"ine the integrit# o$ a

"ateria%& co"'onent or structure or

uantitave%# "easure so"e characteristic o$an o()ect*+


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INTRODUCTIO

N:For inspecting the defects on surface.

Wide group of analysis techniques used in science

&industry.

Saves both the time &money.

Use of this N.D.T in specialist high risk areassuch as nuclear & sea shore structures , gas & oil

pipelines.


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WHY WE ARE USING

N.D.T FORSTRUCTURE?


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WHY WE ARE USING N.D.T?

Its an assessment withoutdoing harm, destroying the

test.

Plays crucial role inensuring cost effective

operation, safety and

reliability of plant.

Cost saving technique in

quality assurance process.


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N.D.TMETHODS

Ultrasonic Testing (UT)Ultrasonic pulse velocity

methodRebound hammer testRadiographic Testing (RT)Liquid penetrate TestingMagnetic particle TestingElectromagnetic Testing (ET)


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N.D.T TESTS

Ultrasonic Pulse

Velocity test.

ReboundHammer test.


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ULTRA SONIC PULSEVELOCITY TEST


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Ul!"#$%&' Pl# Vl$'&*Ul!"#$%&' Pl# Vl$'&*T#T# It measures the time !

tra"e# ! a$ u#tras$i%&u#se &assi$' thru'hthe %$%rete.

The a&&aratus !r

u#tras$i% &u#se"e#%it( measureme$t%$sists ! the!##)i$'*

+a, E#e%tri%a# &u#se'e$eratr

+-, Tra$su%er / $e &air+%, Ami0er+, E#e%tr$i% timi$'

e"i%e


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H$+ & +$!,#

I$ u#tras$i% testi$'1a$u#trasu$ tra$su%er%$$e%te t a

ia'$sti% ma%hi$e is&asse "er the-3e%t -ei$'

i$s&e%te.

There are t)

meths ! re%ei"i$'the u#trasu$)a"e!rm1 re4e%ti$

a$ atte$uati$.


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ULTRASONIC PULSE VELOCITYTEST

The transducer

performs both the

sending and the

receiving of the

pulsed waves as

the "sound" is

reflected back tothe device.

In attenuation mode,

a transmitter sends

ultrasound through

one surface, and a

separate receiver

detects the amount

that has reached it onanother surface after

traveling through the

medium.

Reflection mode: Attenuation mode:


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The &u#se "e#%it( meth is a$ iea#t# !r esta-#ishi$' )hether %$%reteis u$i!rm.

A&ie t -th e5isti$' stru%turesa$ thse u$er %$stru%ti$.

Hi'h &u#se "e#%it( reai$'s are'e$era##( i$i%ati"e ! ' 6ua#it(%$%rete.


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InterpretationInterpretation

To determine the quality & homogeneity ofthe concrete structures.

To determine the existence of the aws,cracks & voids in concrete structures.

Table: Velocity riterion for concrete !uality"rading #$% :'' (art $ ).

S.N$

Pl# l$'&* &% '!$##!$0&%1 (,2/#')

C$%'!"l&*

G!"&%17. A-"e 8.9 E5%e##e$t

:. ;.9 t 8.9 G

;. ;.< t ;.9 =eium

8. >e#) ;.< Du-t!u#


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Ultrasonic Pulse Velocity Test

Advantages:

High penetrating power

High sensitivity

!reater accuracy

Some capa"ility in

estimating the si#e $

shape $ nature of the

flawsporta"ility

Disadvantages:

%anual operation reuires

careful attention "y

e'perience( technicians )ifficulty in inspecting the

parts which are irregular

*euirement of the

couplants Test o"+ects shoul( "e

water resistant


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RE>OUND HA==ER

TEST


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REBOUND HAMMER TEST

This is a sime1 ha$( t#1)hi%h %a$ -e use t &r"ie a%$"e$ie$t a$ ra&i i$i%ati$! the %m&ressi"e stre$'th !%$%rete.


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Re-u$ Hammer test*Re-u$ Hammer test*

The s%hemati%ia'ram sh)i$'"arius &arts ! are-u$ hammer)ere

7.C$%rete sur!a%e:.Im&a%t s&ri$';.Rier $ 'uie r8.Wi$) a$ s%a#e9.Hammer 'uie

. Re#ease %at%[email protected]&ressi"e s&ri$'.L%Bi$' -utt$.Husi$'7


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The elastic mass depends on the hardness of the

surface.

It is related to the compressive strength of the concrete.

The rebound value is designated as the rebound number

or rebound index.

The results are significantly affected by :

A,-i. characteristics+/,Ang%e o$ inc%ination o$ !irection o$ ha""er+

C,-e"(er characteristics+

PRINCIPLE


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'0 '$2!##& #!%15 N/#6.22 l$"1"&%#

!0$% %20!


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A)S!%15 A####2%7

To assess the relative strength of concrete

based on the hardness.

Casting cubes were tested under controlledconditions.

This is due to hardening of concrete surface

due to carbonation.It restricted to relatively new structures only.


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B)S!* $8 +", "%

l"2&%"&%1 '$%'!7It helps to identify relative surface weakness in

cover concrete and to determine the relative

compressive strength of concrete.This survey is carried by dividing the member

into well-defined grid points.

The grid matrix should have a spacing ofapproximately !!mm x !!mm.


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ProcedureProcedure

Shu# -e teste a'ai$st the testa$"i#.

A&( #i'ht &ressure $ the u$'era$ a##) it t e5te$ t the rea(&siti$ !r the test.

A&( a 'raua# i$%rease i$ &ressure

u$ti# the hammer im&a%ts.TaBe the a"era'e ! a-ut 79 reai$'s.


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Advantages:

Assessi$' the #iBe#(%m&ressi"e stre$'th

! %$%rete .

Assessi$' the6ua#it( ! %$%rete i$re#ati$ t sta$arre6uireme$ts.

R0$% H"22! #7


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Interpretation of Results:

The re-u$ reai$' $ the i$i%atrs%a#e has -ee$ %a#i-rate -( thema$u!a%turer ! the re-u$ hammer !rhri$ta# im&a%t.

Average Re(oun! Nu"(er 0ua%it# o$ Concrete"#! $ery good hard layer

! to #! %ood layer

&! to ! 'air

( &! )oor concrete

! *elaminated

Ta-#e* A"era'e Re-u$ $um-er a$ 6ua#it( !%$%rete


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CONCLUSION

For better maintenance of existing

concrete structures, there are stillmore tests have to be done.


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n d Tofstructurdases 130202042533 Phpapp01