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NUKLEARMALAYSIA/L/2012/55

CONCRETE INSPECTION KUALATERENGGANU MEDICAL CENTRE

(2nd

FLOOR)

14 JULY 2012 16 JULY 2012


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Inspection Team

Noor Azreen MasenwatAbdul Bakhri Muhammad,

Rahmad Abd Rashid,Suhairy Sani

Report prepared by Reviewed by

Noor Azreen Masenwat Dr. Mohamad Pauzi Ismail


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MALAYSIAN NUCLEAR AGENCY (NUKLEAR MALAYSIA)INDUSTRIAL TECHNOLOGY DIVISION (BTI)

REPORT NO. BTI/NDTC/11/2

REV. NO 0

CONCRETE INSPECTION REPORTISSUE DATE 16-7-12

PAGE 1 OF

1. GENERAL

1.1 DATE OF SURVEY: 14 - 16 July 20121.2 SURVEYOR: Noor Azreen Masenwat, Abdul Bakhri Muhamad, Suhairy Sani

and Rahmad Rashid1.3 TEL: 03-89250510 (012 2789 542)1.6 PURPOSE OF SURVEY: Concrete Integrity Testing, Examination of Concrete Carbonation,

Examination of reinforcement bar corrosion, determination ofnumbers, size and loacation of reinforcement bar and links,

Concrete Strength Estimation (Rebound hammer andCompression test) ALL TEST WERE CONDUCTED ON 2NDFLOOR

2. SUMMARY OF BUILDING

2.1 NAME OF BLDG.: Kuala Terengganu Medical Centre2.2 ADDRESS: LOT 4075-4083, 4116-4118, Jalan Batas Baru, Kuala

Terengganu, Terengganu3 USE FOR: Building Structure (Abandoned for 20 years)2.4 DATE OF CONSTRUCTION: 19802 5 NO FLOORS: 4


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3.4 USE OF AIR CONDITION: Yes No

3.5 DISTANCE FROM SEA: N/A

3.6 SEA SIDE OF BLDG.: East South West North

3.7 PRINCIPAL DIRECTION OF WIND: East - West3.8 AVERAGE OF WIND SPEED: N/A

4. REFERENCE

4.1 GENERAL DRAWING: Yes

No4.2 DRAWING OF STRUCTURE: Yes No

4.3 CALCULATION OF STRUCTURE: Yes No

4.4 RECORD OF CONSTRUCTION: Yes No

4.5 SPECIFICATION: Yes No

4.6 DATA OF HISTORY: Yes No

5 HISTORY OF BUILDING

5.1 CHANGING OF USAGE: Yes No

5.2 EXTENSION/REBUILDING: Yes No

5.3 REPAIRING: Yes No

5.4 REINFORCEMENT: Yes No

5.5: ACCIDENT: Yes No

5.6 CLAIM: Yes No

6 MATERIAL UTILIZED


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7. RESULTS OF SURVEY

CRACK DENSITY ULTRASONIC REBOUND HAMMER WINDSOR PROBE BAR LOCATOR CARBONATION

RADIOGRAPHY THERMOGRAPHY HALF CELL POTENTIAL

OTHERS (PLEASE SPECIFY) VISUAL INSPECTION

(Please tick for the method (s) used and detailed results of the investigation shall be attached)


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JOB METHOD OF STATEMENT

0.0 GENERAL

0.1 Scope

This Job Method Statement (JMS) provides the details of work steps for performingconcrete integrity inspection at Kuala Terengganu Medical Centre.

The inspection works includes of supplying data such as main bar size, links size, number

of bars at columns, beams and distance of links used for redesigning.

Other tests conducted are Visual Inspection, Half Cell Potential, Rebound Hammer,Concrete Compression Strength and Carbonation Strength to estimate concrete life span.

The duration for the work execution at site is 5-6 days. Inspection was done on 2nd floorbuilding.

1.0 CONCRETE INTERGRITY INSPECTION

2.1Visual Inspection, please refer Attachment 1.

2.2Concrete Covermeter, please refer Attachment 2.

2.3Half Cell Potential, please refer Attachment 3.

2.4Rebound Hammer, please refer Attachment 4.2.5Concrete Compression Strength Test, please refer Attachment 5.

2.6Carbonation Test, please refer Attachment 6.


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Atth 1

METHOD OF STATEMENT FOR VISUAL INSPECTION

1.0 SCOPEThe purpose of visual inspection is to identified and differentiates various sign of distress includingcracks, pop outs, spalling, disintegration, colour change, weathering, staining, surface blemishesand lack of uniformity. Extensive information gathered from visual inspection gives preliminaryindication of the structure condition.

2.0 PRINCIPLEVisual testing is the most important of all non-destructive tests. It can often provide valuableinformation to the well trained eye. Visual features may be related to workmanship, structuralserviceability, and material deterioration and it is particularly important that the engineer is able todifferentiate between the various signs of distress which may be encountered.

3.0 APPARATUSa) Measuring tapes;

b) Rulers;c) Markers;d) Borescope; ande) Digital Camera.

4.0 PROCEDUREBefore any visual test can be made, the engineer must peruse all relevant structural drawings,plans and elevations to become familiar with the structure. Available documents must also beexamined and these include technical specification, past reports of tests or inspection made,construction records, details of materials used, methods and dates of construction, etc.


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Atth 2

METHOD OF STATEMENT FOR COVERMETER

1.0 SCOPEThe purpose of covermeter inspection is to determine the presence, location and depth of rebars inconcrete and masonry components. Advanced versions of covermeter can also indicate bardiameter when cover is known.

2.0 REFERENCES

The calibration report of covermeter meets the requirement of SIA 162/DIN 1045, DZZfP B2 andBS 1881: part 204.

3.0 PRINCIPLEThe basic principle is that the presence of steel affects magnetic field. An electromagnetic searchprobe is swept over the surface of the concrete under test. The presence of reinforcement withinthe range of the instrument is shown by movement of the indicator needle. When the probe ismoved until the deflection of the needle is at a maximum, the bar in question is then parallel to the

alignment of the probe and directly beneath it. The needle indicates the cover on the appropriatescale for the diameter of the reinforcing bar.

4.0 APPARATUSa) Profometer 5 (PROCEQ)

5.0 PROCEDUREThe search head is traversed systematically across the concrete until a position of maximumdisturbance of the electromagnetic field is indicated by a meter or by an audible signal. In such aposition, under ideal conditions, the indicated cover to the nearest piece of reinforcement may be


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Atth 3

METHOD OF STATEMENT FOR HALF CELL POTENTIAL MEASUREMENT

1.0 SCOPEThe half-cell provides a relatively quick method of assessing reinforcement corrosion over a widearea without the need for wholesale removal of the concrete cover. Quantitative measurements aremade so that a structure can be monitored over a period of time and any deterioration can benoted.

2.0 REFERENCESThe calibration report CANIN CORROSION ANALYSING INSTRUMENT meets the requirement ofRILEM TC 154-EMC, BS 1881 Part 201 and ASTM C876-91.

3.0 PRINCIPLEElectrical potential of steel reinforcement is measured relative to a reference electrode (half-cell).This enables potential contour maps to be plotted. The electrode potential of steel in concreteindicates the probability of corrosion.

4.0 APPARATUSa) Half Cell;b) Electrical Junction Device;c) Electrical Contact Solution;d) Voltmeter; ande) Electrical Lead Wire.

5.0 PROCEDUREMeasurements are made in either a grid or random pattern. The spacing between measurements


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Atth 4

METHOD OF STATEMENT FOR REBOUND HAMMER

1.0 SCOPERebound Hammer measured the surface hardness of concrete and provides an estimation ofsurface compressive strength, uniformity and quality of concrete.

2.0 REFERENCESThe calibration report of rebound hammer meets the requirement of ISO/DIS 8045, EN 12 504-2

and BS 1881 Part 202.

3.0 PRINCIPLERebound hammer consists essentially of a metal plunger, one end of which is held against theconcrete surface while the free end is struck by a spring loaded mass which rebounds to a point ona graduated scale. The point is indicated by an index rider. The amount of rebound increases withincrease in concrete strength for a particular concrete mix.

4.0 APPARATUSa) Schmidt Rebound Hammer.

5.0 PROCEDURERebound hammer is being pushed hard against the concrete until the latch connects the hammermass to the plunger. The plunger is then held perpendicular to the concrete surface and the bodypushed towards the concrete. This movement extends the spring holding the mass to the body.When the maximum extension of the spring is reached, the latch releases and the mass is pulledtowards the surface by the spring. The mass hits the shoulder of the plunger rod and reboundsbecause the rod is pushed hard against the concrete. During rebound the slide indicator travels


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Atth 5

METHOD OF STATEMENT FOR CONCRETE COMPRESSION STRENGTH

1.0 SCOPE AND PRINCIPLEThe purpose of concrete coring is to confirm the findings of the non-destructive test,

identifying the presence of deleterious matter in the concrete, ascertaining the strength ofthe concrete for design purposes, predicting the potential durability of the concrete,

confirming the mix composition of the concrete for dispute resolution and determining

specific properties of the concrete not attainable by non-destructive methods such as

intrinsic permeability.

2.0 APPARATUSa) Coring machine;

b) Clean water; andc) Diamond Core Rig.

d) Compression Machine

3.0 PROCEDUREDetermine the final location for concrete coring by locating the precise location of rebar

by using a covermeter. When the coring process is being utilized, it should be donecarefully without any contact to the reinforcement bar.

4.0 TEST REPORTThe data of concrete coring is being recorded systematically and being presented in the

test report for references.


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Atth 6

METHOD OF STATEMENT FOR CARBONATION TEST

1.0 SCOPECarbonation depth measurement is used to estimate the presence of moisture into the concrete. Ifthe entire concrete cover over the reinforcing steel is carbonated, corrosion of the steel wouldoccur.

2.0 PRINCIPLE

The 1% phenolthalein solution is made by dissolving 1gm of pehnolthalein in 90cc of ethanol. Thesolution is then made up to 100cc by adding distrilled water. On freshly extracted cores the core issprayed with phenolphthalein saolution, the depth of the uncoloured layer (the carbonated layer)from external surface is measured to the nearest mm.

Test can also be done in a drill hole.

3.0 APPARATUS

a) 1% phenolthalein solution

4.0 TEST REPORTThe rebound no. of concrete structure is being recorded systematically and being presented in thetest report for references.


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TEST RESULT FOR DETERMINATION OF NUMBER OF BAR, LINKS, DISTANCE AND SIZE

Gambar keseluruhan 2nd floor (tempat buat test)

Column (2nd Floor)Grid : 9-B

Distance between links : 200mm

Link size : 10mmBar size : 30mmNumber of Bar : 6Distance between bar : 250mm

250mm 250mm

200mm

= 10mm

= 30mm


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Column (2nd Floor)Grid : 10-B

Distance between links : 200mmLink size : 10mmBar size : 30mmNumber of Bar : 6Distance between bar : 250mm

250mm 250mm

200mm

= 10mm

= 30mm


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Column (2nd Floor)Grid : 9-A

Distance between links : 200mmLink size : 10mmBar size : 20mmNumber of Bar : 6Distance between bar : 250mm

250mm 250mm

200mm

= 10mm

= 20mm


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Beam (2nd Floor)Grid : E 9-10

Distance between links : 150mmLink size : 10mmUpper Bar size : 10mmLower Bar Size : 30mm

150mm

= 10mm

= 10mm = 10mm


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Beam (2nd Floor)Grid : B 9-10

Distance between links : 80mm (near column) and 150mm (middle of the beam)Link size : 10mmUpper Bar size : 10mmLower Bar Size : 25mm

gambar

= 10mm

= 10mm

= 25mm

80mm

150mm


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Beam (2nd Floor)Grid : 9 A-B


130mmm

= 30mm

= 10mm = 10mm


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Beam (2nd Floor)

Grid : A 9-10


= 10mm = 10mm

= 30mm

150mmm


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TEST RESULT TO ESTIMATE CONCRETE STRUCTURE LIFE SPAN

Gambar buat test (plan)

Rebound Hammer, Carbonation Test and Half Cell Potential results as shown in Table 1

Table 1 : Rebound Hammer, Carbonation Test and Half Cell Potential Result

Location Grid : 9-B Grid : 10-B Grid 9-A Grid E 9-10 Grid B 9-10

Condition of test Concrete Surface : Smooth SurfaceMoisture : Dry SurfaceMovement : No Structural MovementTest Direction : Horizontal

Rebound No. 52 53 5050 56 5250 50 50

50 50 50

48 46 5046 48 4848 46 50

48 48 50

48 50 5246 48 4846 48 50

48 48 50

48 50 5246 48 4846 48 50

48 48 50

48 50 5246 48 4846 48 50

48 48 50

Average Rebound No 51 48 49Estimated Strength (N/mm2) 51 48 49

Carbonation Test 0.1mm 0.1mm 0.1mm 0.1mm 0.1mm

Half Cell Potential Range 20.2mV 42.8mV -23mV 0.3mV 12.3mV 32mV 36mV 64mV -20mV 12mV

Concrete Compression Strength Test


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