Oppenheimer Film Discussion for Philosophy and Film
Timmareddy
1. SEMINAR REPORT ON
NON DESTRUCTIVE TEST
Presented by
Timmareddy
VIII sem civil engg
under guide
prof ; RENUKASWAMY GAVAI1
2. INTRODUCTION
NEED FOR TESTING
VISUAL INSPECTION FOR NDT TESTING
NDT METHOD OF TESTING
CONCLUSION
CONTENTES
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3. The quality of product was checked & evaluated by NDT
method .
most of the materials made of concrete such as
buildings,tunnels,dams,bridges etc
NDT as ability to determine the strength & durability of
critical construction without damaging them
The main advantages is the quality of concrete structure
is determine without damaging
INTRODUCTION
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4. Proposed change of usage or extension of a
structure
Acceptability of a structure for purchase
Acceptability of a structure for insurance
To test the material components without disturbing
its excites
Monitoring long-term changes in material properties
and structural performance
NEED FOR TESTING
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5. Visual inspection is very important to knowing
structure details about any defects in concrete .to
note any presences of cracking and the cracking
type .
History of the structure
VISUAL INSPECTION FOR NDT TESTING
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6. Fig 3: Serious crack at building
structure. Fig 4: Exposed bar
Fig 1: Serious cracks at bridge
structure
Fig 2: Watermark indicates leak
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7. There are several NDT methods are applicable to
concrete structure
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1. Ultrasonic pulse velocity test
2. Rebound test
3. Rebar detective test
4. Rebar corrosion detective test
8. Used to asses the quality and strength of in-situ concrete
in structural member.
Its used to check the compaction of
concrete,uniformity,determination of cracks
PUNDIT (portable ultrasonic NON-destructive digital
indicating tester ) from U.K
Consists of a pair of transducers (probes) of different
frequencies, electrical pulse generatet,eletrical timing
devices and cables.
It’s based on the through-transmission technique.
ULTRASONIC PULS VELOCITY TEST
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12. Pulse velocity will be measured in concrete by
placing “TRANSDUCERS ACROSS” the member
exactly opposite to each other.
DIRECT METHOD
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13. INDIRECT METHOD
Pulse velocity will be measured in concrete by placing
transducers on the SAME PLANE of the member
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14. Pulse velocity will be measured in concrete by placing
transducers intermediate between those of the other two
method.
SEMI DIRECT METHOD
SEMI-DIRECT TRANSMISSION OF PULSE
IN R.C.DECK
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15. METHOD OF CALCULATION
OF PULSE VELOCITY
Velocity = distance traveled / path length
Time taken
Pulse Velocity in concrete will be represented
in Km/sec.
Classification of the quality of concrete on
the basis of the pulse velocity
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PLUSE VELOCITY (KM/SEC) QUALITY OF CONCRETE
ABOVE 4.5 EXCELLENT
3.5 TO 4.5 GOOD
3.1 TO 3.5 POOR
BELOW 3.O VERY POOR
16. This is quick method or assessing the quality of
concrete based on the surface hardness indicated
by the rebound number.
An higher rebound value indicates the higher
strength or surface hardness of concrete.
This equipment works based on the spring
controlled hammer mass or slides on a plunger
within a tubular housing.
REBOUND HAMMER TEST
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19. METHOD OF TESTING
Rebounb hammer can be used on the concrete
surface at five different positions for assessment of
surface hardness and strength estimation at site
depending on the availability of exposed surface of
concrete.
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oHORIZONTAL
oVERTICALLY UPWARDS
oVERTICALLY DOWNWARDS
oINCLINED VERTICALLY UPWARDS
oINCLINED VERTICAL DOWNWARDS
24. REBAR DETECTIVE TEST
The PROFOMETER 5 locates reinforcing bars,
spacing of bar, complete accuracy.
It also helps in preparing structural drawing of the
structural member in the absence of details about
the building.
This is works on electromagnetic principle
equipment consists of display unit coupled with
probes of different types
The identified concrete surface will be cleaned such
that it if free from dust, oil,
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29. The method of half cell potential measurements
normally involves measuring the potential of an
embedded reinforcing bar.
This is usually a copper / copper sulphate, or silver
/silver chloride cell
EQUIPMENTS RAE USED
HALF CELL
ELECTRICAL JUNCTION DEVIES
VOLTMETER
ELECTRICAL LEAD WIRES
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REBAR
CAROSSIVE
DETECTIVE TEST
32. Potential difference level (m v) Chances of rebar corroded
Less than -500 Visible evidence of corrosion
-350 to -500 95%
-200 to -350 50%
More then -200 05%
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RISK OF CORROSION AGAINST THE POTENTIAL
DIFFERENCES READING
33. Non destructive test are relatively performed in
concrete structure
The quality of product was checked & evaluated by
NDT method without disturbing the structure
NDT now considered as a powerful method for
evaluating existing concrete structure
Cover meter is the method from which approximate
mapping of the structure can be done
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CONCLUSION
