Timmareddy

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Timmareddy

  1. 1. SEMINAR REPORT ON NON DESTRUCTIVE TEST Presented by Timmareddy VIII sem civil engg under guide prof ; RENUKASWAMY GAVAI1
  2. 2.  INTRODUCTION  NEED FOR TESTING  VISUAL INSPECTION FOR NDT TESTING  NDT METHOD OF TESTING  CONCLUSION CONTENTES 2
  3. 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 3
  4. 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 4
  5. 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 5
  6. 6. Fig 3: Serious crack at building structure. Fig 4: Exposed bar Fig 1: Serious cracks at bridge structure Fig 2: Watermark indicates leak 6
  7. 7. There are several NDT methods are applicable to concrete structure 7 1. Ultrasonic pulse velocity test 2. Rebound test 3. Rebar detective test 4. Rebar corrosion detective test
  8. 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 8
  9. 9. Portable Ultrasonic Nondestructive Digital Indicative Technique (PUNDIT) Size: 180 X 110 X 160mm Weight 3kg 9
  10. 10. 10 1. DIRECT METHOD 2. IN DIRECT METHOD 3. SEMI DIRECT METHOD
  11. 11. 11 DIRECT METHOD SEMI-DIRECT METHOD INDIRECT METHOD PUNDITH METHODS
  12. 12.  Pulse velocity will be measured in concrete by placing “TRANSDUCERS ACROSS” the member exactly opposite to each other. DIRECT METHOD 12
  13. 13. INDIRECT METHOD  Pulse velocity will be measured in concrete by placing transducers on the SAME PLANE of the member 13
  14. 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 14
  15. 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 15 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. 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 16
  17. 17. Fig: Rebound Hammer. Weight < 2Kg Impact Energy = 2.2Nm Suitability 20 – 60 MPa 17
  18. 18. REBOUND HAMMER WORKING 18
  19. 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. 19 oHORIZONTAL oVERTICALLY UPWARDS oVERTICALLY DOWNWARDS oINCLINED VERTICALLY UPWARDS oINCLINED VERTICAL DOWNWARDS
  20. 20. Fig: Testing by Rebound Hammer by Horizantal 20
  21. 21. POSITION OF REBOUND HAMMER - VERTICAL UPWARDS 21
  22. 22. POSITION OF REBOUND HAMMER - VERTICAL DOWNWARDS 22
  23. 23. 23 DIGITAL REBOUND HAMMER REBOUND HAMMER
  24. 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, 24
  25. 25. ESTIMATION OF COVER AND MAPPING OF REBARS IN ABUTMENT 25
  26. 26. ESTIMATION OF COVER AND MAPPING OF REBARS IN BEAM 26
  27. 27. 27DISPLAY VIEW ONLY
  28. 28. 28
  29. 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 29 REBAR CAROSSIVE DETECTIVE TEST
  30. 30. 30
  31. 31. 31
  32. 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% 32 RISK OF CORROSION AGAINST THE POTENTIAL DIFFERENCES READING
  33. 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 33 CONCLUSION
  34. 34. THANK YOU

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