R3-050819-Sonic Complete Report

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Geotechnical Contractor & Engineering ServicesSpecialist in Design, Analysis, Supervision or Execution of:Dewatering - Pumping Test - Soil Nailing - MicroPile - Grouting -Soil Instrumentation - Pile/Plate Load Test - PDA -PIT - Vibrationmonitoring - Sonic Logging - Deep Foundations - Geosynthetics -Slope Stability - Ground Improvements & Other Geotechnical WorksAgent of PLAXIS computer software

GTL 8 Geylang East Ave 2 #02-05Singapore 389757Tel/Fax: 65-67461836Email : [email protected]

Report on

SONIC LOGGING TEST

For

CITYLOFTS PROJECT

Located at

Jalan KH Mas Mansyur

JAKARTA

VOL 3

By

GOUW Tjie Liong Ir., M.Eng.

Jakarta, August 19, 2005


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Report on

SONIC LOGGING TEST

forCITYLOFTS PROJECTJalan KH Mas Mansyur

JAKARTA

VOL 3

A. INTRODUCTION

To check the concrete integrity of bored piles at their on going CITYLOFTS project, PT.Duta Anggada Realty, has called for Sonic Logging Test. This report present the result of19 piles tested on August 12 and 13, 2005.

Up to this report 70 piles had been tested.

B. THE SONIC LOGGING TECHNIQUE

The Sonic Logging technique is used to detect defects in concrete structures such as castin-situ piles, caissons, barrettes and diaphragm walls.

Such tests can produce an economic survey of the homogeneity of each structure tocomplement the more expensive load capacity testing (pile loading test).

During the construction of caissons, bored and other cast-in-situ concrete piles, thefollowing defects may be encountered:

Honeycombing and/or Segregation due to improper concrete placement methods Washout of cement due to ground water flow Cracks in the pile shaft due to shrinkage Inclusion of soil causing contamination of concrete Necking and arching of the pile due to collapse of side walls during withdrawal of

temporary support / casing.

To perform the cross hole sonic logging, a number of steel tubes are installed duringconstruction of the foundation to allow the lowering of transmitter and receiver probes.Ultrasonic waves passed through the structures are delayed and absorbed depending onthe physical properties of the structure. The signal is displayed for interpretation.


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C. THE TEST RESULTS

The logging data are given in the appendix. The interpretation of the test results are givenbelow:

Table 1 The Test Result

Test No.Pile Design

Diameter (mm)Pile Reference

No.SONIC LOGGING

RESULTS

CONCLUSIONfrom

SONIC LOGGING

DateTested

FURTHER ACTIONREQUIRED

52 1000 21

relatively uniform signalalong 40-45m effective

length tested; One of thepipe clog at about 43 m

depth.

acceptable 13-Aug-05

Check the elevation ofthe sonic pipe to

proved that the soundconcrete at the cut offlevel. Reason: the logshows sound concretestarting from 13 m from

top of sonic pipe.

53 1000 23

Uniform signal obtain alongthe 46 m pile tested. Veryweak signal at toe. Could

be soft toe


54 1000 52Uniform signal along the

45m pile tested good pile 13-Aug-05

55 1000 53Uniform signal along the

45m pile tested good pile 13-Aug-05

56 1000 66relatively uniform signal

along 45m effective lengthtested


57 1000 80slight signal delay at about5-6m; weak signal at toe

(soft toe)acceptable 12-Aug-05


along 45m effective lengthtested

good pile 12-Aug-05

59 1000 320uniform signal along 43m

effective length tested;weak signal at toe (soft toe)



along the effective lengthtested;




top of sonic pipe.

61 1000 348

relatively uniform signalalong 42m the effective

length tested; weak signalat toe (soft toe)




top of sonic pipe.

August 12-13, 2005 SONIC LOGGING TEST RESULTS (Report Vol. 3)CITYLOFTS PROJECT - Jl. KH MAS MANSJUR - Jakarta


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Table 2 PILES THAT NEED IMMEDIATE ATTENTION

Test No.Pile Design

Diameter (mm)Pile Reference

No.SONIC LOGGING

RESULTSCONCLUSION

fromSONIC LOGGING

DateTested

FURTHER ACTIONREQUIRED

62 1000 48

Very weak signal /signallost at about 30 to 31.5 mdepth from ground (about

22.6-24.3m effectivelength); weak signal at toe

(soft toe)

defects at 30 to31.5m effective

length13-Aug-05

Coring / Jet grout / Replace

63 1000 54signal lost at 44 m depthfrom ground (about 42m

effective length)

defects at 41.8-42.2m effective

length13-Aug-05


64 1000 55

signal lost at 11-12m fromground (1-2m eff legnth)significant signal delay at23.5-24.5m from ground

(13.5-14.5m effective

length); soft toe

defects at 1-2m and13.5-14.5m effective

length13-Aug-05


65 1000 56

signal delay at 33m depth(25m eff. Length); signallost at 35.1-35.5m depth(27.1-27.5m eff. length)

defects at 25m and27.1-27.5m eff.

Length13-Aug-05 Coring / Jet grout /

Replace

66 1000 134significant signal delay at

38.5m; 46-47m depth(29.5; 37-38m eff length)

defects at 29.5m and37-38m eff. Length

13-Aug-05 Coring / Jet grout / Replace

67 1000 135

weak/lost of signal along11-18m; 25-27m; 36-

38m;48-49m (1-8; 15-17;26-28;38-39m eff length)

defects at 1-8; 15-17;26-28;38-39m eff

length13-Aug-05

BAUER has agreed tocore the pile to the

bottom to check thepile

68 1000 136Signal lost at 47-48m depth

(37-48m eff. Length)defects at 37-48m

eff. Length 13-Aug-05Coring / Jet grout /

Replace

69 1000 137

Signal lost at 18-19m depth(8-9m eff. Length); very

weak signal 2m from toe atloss signal at toe

defects at 37-48meff. Length; soft toe 13-Aug-05


70 1000 426

signal delay at 25.5; 27m(15.5-27m eff. Length); lostof signal at 43-43.5m (33-

43.5 eff.length)

defects at 15.5-27man 33-43.5 eff.length 12-Aug-05


Notes:

PILE THAT NEEDS IMMEDIATE ATTENTION

On Agust 18, 2005 meeting attended by DAR (Joko and Hutapea), GTL (Gouw), Arkonin (Juswadji, Zakky), Bauer (Tatok, Jatnoko,Fajar). Bauer has agreed to core pile no 135 and 137. Prior to coring PIT will be performed. Based on the result further action on thesuspected defected piles will be decided.

August 12-13, 2005 SONIC LOGGING TEST RESULTS (Report Vol. 3)CITYLOFTS PROJECT - Jl. KH MAS MANSJUR - Jakarta

Table 2 above, shows some of the piles that need immediate attention. The test resultsshows significant signal delay or signal lost. This indicating a certain defect or necking in

the piles.A meeting has been conducted on August 18, 2005. The meeting was attended by:

The Owner (PT Duta Anggada Mr. Joko and Mr. Hutapea) The Geotechnical Consultant (Gouw Tjie Liong) The Supervisor (PT Arkonin Mr. Juswadji, Mr. Zakky) The Piling Contractor (PT Bauer Pratama Indonesia Mr. Tatok, Mr. Jatnoko, Mr.

Fajar)


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During the meeting the suspected defective piles were discussed. It was presented thatpile no 51 and pile no 228 has been excavated, it was found out that indeed the piles hassome defects. The defective portion was totally hacked off and re-casted (see Table 3).

Table 3 Piles That Has Been Repaired

Test no. Pile DesignDiameter (mm)

Pile ReferenceNo.

SONIC LOGGINGRESULTS

CONCLUSIONfrom

SONIC LOGGING

DateTested

REMARK

47 1200 51

SIGNAL LOST at top 5 to7m from ground in all 3sonic pipes; very weak

signal at bottom

necking / significantdefects at top 5 to

7m; soft toe28-Jul-05

Pile has beenEXCAVATED, found

out that there aresoil/dirty

concrete/honey combsaround the concrete

sleeve. Inside the bodyof the pile is OK. Hack

off the top part andrecasted.

50 1000 228

SIGNAL LOST at top 3 to5.5m from ground in all 3sonic pipes; signal lost at50-50.3m in direction of

BC; the rest is OK

necking / significantdefects at top 3 to

5.5m; slight neckingat50-50.3m

28-Jul-05

Pile has been

EXCAVATED on July29, found out that thereare soil/dirty

concrete/honey combsaround the concretesleeve. The tie barexposed. Inside the

body of the pile is OK.Hack off the top part

and recasted onAugust 1.

PILE THAT HAS BEEN REPAIRED as of August 19, 2005

Figures 1 to 2 shows the defective pile no 228 when excavated.

Fig. 1 Condition of Pile 228 after Excavated(Defects clearly seen)


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Fig. 2 Condition of Pile 228 after Excavated(Defects clearly seen)

It was also decided that pile no 135 and 137 shall be immediately cored to the bottom toverify the pile integrity. Prior to that the pile, PT Bauer Pratama shall also perform PIT teston the piles. Further decision shall be taken when the PIT and coring results are available.

Jakarta, August 19, 2005Prepared by:

Ir. GOUW Tjie-Liong M.EngPrincipal - Certified Geotechnical Engineer (HATTI)

Encl: Sonic Logging Graphs (for piles tested on August 12-13, 2005)


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APPENDIX

THE TEST GRAPHS


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Documents

R3-050819-Sonic Complete Report