mce487 sonic logging report bp mc140 00b 2

7/30/2019 MCE487 Sonic Logging Report BP MC140 00B 2

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--Site Office

Contract 487

SONIC LOGGING TEST REPORT

FOR

BORE PILE BP_MC140

REPORT NO: TESTING DATE:

TUKSU ENGINEERING AND CONSTRUCTION (S) LTD

Prepared by: Checked by:

1 04-Mar-2011

FJADI Engineering (S) Pte Ltd128 Joo Seng Road #05-06

DP Computer Building

Singapore 368356 Tel: 62876408 Fax: 62875848

Main Contractor:

Sonic Logging Test Contractor:


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Content

I. General .............................................................................................................................. 3

II. Test Results ....................................................................................................................... 5

1. General Information: ....................................................................................................... 52. Summary results: ............................................................................................................ 63. Interpretation and Comment: .......................................................................................... 64. Detail processed result, Graph and Image: ..................................................................... 7

III. Appendix ........................................................................................................................... 71. Sonic Testing Filed Work Record Sheet2. Pile Record

3. Calibration Certificate

4. Pile location and layout

5. Photo records

Notes:

Test and report are conducted and prepared in accordance to standard ASTM 6760-02


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I. General

The CSL (Cross hole Sonic Logging) test has been adopted to evaluate the integrity of

Bore Pile by measuring the response of an ultrasonic pulse passing from a signal source

in one access tube to a receiver in a second access tube.

Figure.1 Sonic Logging Test Scene Diagram

5~6 Access tubes had been pre-installed by main contractor during the Bored Pile casting

for each testing pile. The typical layout of the access tubes and section elevation are as

follows:

RS-ST01D

Digital. Ultrasonic Unit

Computer

Data processing

PileTubes

Transducer


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6 tubes layout 5 tubes layout

Figure.2:Section layout for Bored pile with Sonic logging and coring tube

50mm Sonic logging tube

150mm Sonic Coring

Tube

Main Bars

Links

S acer blocks

External Links

Toe Level

150mmSonic Corin tube

Bored hole

Spacer blocks

Main bars

200mm

500mm

Bentonite

slurr

Figure: 3 Section Elevation

50MMSonic logging tubes


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RS-ST10D Digital Ultrasonic Unite with a microprocessor-based system has been used for

the field test and data processing in this project. The equipment has been sent for the

calibration before the test, the field work has been carried out according to the submitted

method statement.

Sonic logging test has been carried out on site for the Bored Pile BP_MC140 on 04.03.11.

This report is to present the summary results of sonic logging test for BP_MC140. The

details comprise tabulated data and graph on wave velocity vs. depth, amplitude of the pulse

vs. depth and first arrival time vs. depth. The logging wave images are also attached in this

report for information. Based on the field record, processed results and analysis, the

engineering interpretation for each pile test is given in this report.

II. Test Results

1. General Information:

Pile No: BP_MC140 Test Date: 04.03.2011

Location: N30592.486 E32676.798 Ground Level: 105.12 (m RL)

Cut off Level: 89.997 mRL Pile length (below C.O.L): 53.997m

Pile/Barrette Size: 1800 Actual Toe. Level: 36.0 (m RL)

Grade of concrete: G40 No. of Tubes: 6

6

4

1 BP_MC140

N


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2. Summary results:

SectionNo.

First ArrivalTime (ms)

Wave Speed(m/s)

Dis. ofTube(mm)

Test Depth(m)*

Interpretation /

Remarks

1-2 0.161 5707 920 67 Integrated

2-3 0.146 2946 430 67 Integrated

3-4 0.189 4043 760 69 Integrated

4-5 0.151 2801 420 69 Integrated

5-6 0.155 2934 290 69 Integrated

6-1 0.167 3085 410 69 Integrated

1-5 0.279 3085 860 69 Integrated

1-4 0.332 3289 1090 69 Integrated

1-3 0.264 4450 1170 69 Integrated

2-6 0.286 3644 1040 67 Integrated

2-5 0.315 3997 1260 67 Integrated

2-4 0.278 4627 1080 67 Integrated

3-5 0.272 4051 1200 69 Integrated

3-6 0.329 3225 1060 69 Integrated

4-6 0.248 2629 650 69 Integrated

* Cut off Level 89.997m RL @ depth 11.218m from top level 101.084 m RL of the access tubes.

* The distance of section are base on distance measuring on site between the accesses tubes of the top

potion of the pile.

* Access tube 2 blocked at depth 67m so all testing depth relevant to tube 2 is 67m.

* The depth measured from the top of the Access tube 105.097~105.235 m RL.

3. Interpretation and Conclusion:

The most of first arrival time(FAT) and the amplitude of the longitudinal wave in all the section are

consistent and no significant weak signal potion found from the bottom to the cut off level of the pile

during testing of BP_MC_140. The average transmission velocities of all section which calculated

base on the distance measured on site is typical of being good quality concrete as stipulated in

ASTM6760-08. There was no clear outright indication of major irregularities in all sections. This pile

was identified to be structurally sound with no significant defects detectable.

The velocity range of Concrete is from around 3000 to 6000 mps that base on the brand of cement,

density of concrete, steel bar distributing, casting time and distance between access testing tubes. The


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analysis of the initial pulse arrival time, velocity, relative pulse energy/amplitude and stacked

waveform plotted versus depth. Base the results on the percent reduction in velocity value from a

nearby zone of good quality concrete with good signal amplitude and energy as correlated to the

following:

Concrete Condition Rating Criteria (CCRC)

CCRC Rating

Symbol

Velocity

Reduction

Indicative Results

Good G 10 % Good quality concrete

Questionable

Defect

Q >10 % & < 20 % Minor concrete contamination or intrusion and

questionable quality concrete

Poor P/D > 20 % Defects exist, possible water/slurry

contamination, soil intrusion and/or poor

quality concrete

No Signal NS No Signal

received

Soil intrusion or other severe defect absorbed

the signal (assumes good bond of the tube-

concrete interface)

Water W V = 4750 fps

(1450 mps)

to 5000 fps

(1525 mps)

Water intrusion or water filled gravel intrusion

with few or no fines present

4. Detail processed result: Data; Graph and Image:

III. Appendix

1. Sonic Testing Filed Work Record Sheet

2 Pile Record

3 Calibration Certificate

4 Pile location and layout

5 Photo records

mce487 sonic logging report bp mc140 00b 2

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