North Carolina Experience with Embedded Data Collectors
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1 North Carolina Experience with Embedded Data Collectors Mohammed A. Mulla, P.E., CPM, MCE. Assistant State Geotechnical Engineer / Contract and State wide Manager North Carolina Department of Transportation Geotechnical Engineering Unit August 13,
2 Presentation Outline NCDOT History with Dynamic Testing NCDOT Familiarity with EDC Experience with EDC Current and Future Plans for EDC Embedded Data Collectors Mohammed A. Mulla NCDOT 8/13/2014 Benefits of Using EDC 1
3 NCDOT History with Dynamic Testing Pile Dynamic Testing 1987 GC back PDA Pile Driving 1997 PDA with DOS PAK version 2001 PDA with Window version GC Blue Box PAK-DOS PAK-Window 2
4 NCDOT History with Dynamic Testing Pile Integrity Testing 1992 PDI (Pile Integrity Testing) 1993 TNO (Sonic Integrity Testing) 2007 PIT-W (Unknown Foundation) 3
5 Pile Dynamic Testing Process During Design Process GRLWEAP (WEAP) Driveability analysis Select hammer size (assume hammer) Recommend specific range of hammer energy Embedded Data Collectors Mohammed A. Mulla NCDOT 8/13/2014 During Construction Evaluate the specific hammer submitted by contractor Provide driving criteria If PDA is recommended, then CAPWAP will be used to refine WEAP analysis to generate driving criteria 4
6 Our familiarity with Embedded Data Collectors (EDC) FDOT and University of Florida research Estimating pile capacity during construction was completed Smart Structures got license agreement from University of Florida FDOT mandated that all of their test piles must have EDC to collect enough data to conduct their own comparison with PDA and static load tests Embedded Data Collectors Mohammed A. Mulla NCDOT 8/13/ FDOT adapted the use of EDC in their special provision AFT and Smart Structures communication with us 5
7 NCDOT Experience with EDC NCDOT agreed with AFT to try the EDC in 2 piles B-1381 Sampson County 12 (305mm) Prestressed Concrete Pile See Table 1 Embedded Data Collectors Mohammed A. Mulla NCDOT 8/13/2014 NCDOT prepared the Pile detail and special provision 6
8 Embedded Data Collectors Do not use the EDC Consultant shown above for the PDA consultant on the prestressed concrete piles Mohammed A. Mulla NCDOT 8/13/2014 This is a sample image. Similar documentation will be posted to the AII Embedded Data Collectors website in the near future. 7
9 EDC Pile Details This is a sample image. Similar documentation will be posted to the AII Embedded Data Collectors website in the near future. 8
10 EDC and PDA 9
11 EDC Communication Problem Embedded Data Collectors Mohammed A. Mulla NCDOT 8/13/2014 PDA test by different consultant 10
12 PDA and EDC during driving Short Pile (28 ) 11
13 EDC Total Capacity Comparison to PDA 12
14 EDC Force Comparison to PDA This is a sample image. Similar documentation will be posted to the AII Embedded Data Collectors website in the near future. 13
15 Cost: Sole source: Confidence: The EDC was more expensive than the PDA (probably twice the cost) and for that reason we did not pursue the EDC as another dynamic test method at that time. It was an issue to use and recommend a technology with sole source without proper justification. Without trying and confirming the results of the EDC with static load tests and PDA, it would be very hard for us to accept and implement such technology. Embedded Data Collectors Mohammed A. Mulla NCDOT 8/13/2014 Smart Structures mentioned a few future changes that will enhance the results of the analysis. 14
16 Current and Future Plans for EDC 2011 NCDOT designated a couple of projects to use EDC, PDA, and Static Load tests Embedded Data Collectors Mohammed A. Mulla NCDOT 8/13/ R-3307 New Bridge over Gallants Channel in Carteret County: Unfortunately, this project was delayed letting multiple times. Current letting date is January R-2633BB Dual Bridges on L- (US17) over Cape Fear River in Brunswick and New Hanover Counties. Current letting date is September
17 R-2633BB Dual Bridges on L-(US 17) over Cape Fear River (Let September 2013) 16
18 Access by Swamp Loggers 17
19 Concrete Piles with HP Steel Pile Stinger Tip 18
20 18 voided Concrete Piles 19
21 EDC Installation Details R2633BB This is a sample image. Similar documentation will be posted to the AII Embedded Data Collectors website in the near future. 20
22 EDC and PDA during Driving the concrete pile Wireless EDC PDA Install Gauges PDA 21
23 After the restrike (4hrs., 12 hrs. and 72hrs.) Static Axial Compressive Load Test 22
24 Premature Failure during Static Load Test Design Load= 1,660 kips Pile Cracked= 1,641 kips Ultimate capacity = 4841 kips (7.5 ksi Conc.) 23
25 R-3307 Bridge over Gallants Channel (Under Construction now) A total of four (4) EDC are required for the same prestressed concrete piles tested with the Pile Driving Analyzer (PDA) One (1) EDC on the Static Axial Compressive Load Test pile Bridge Length = 3,395 24
26 R-3307 Bridge over Gallants Channel 25
27 PDA Pile Length 105 EDC 26
28 PDA Install Gauges 27
29 NCDOT Current and Future Plans for EDC EDC is ready to use technology (FDOT success) NCDOT is pursuing this technology by taking the first step (two pilot projects) The outcome from the two proposed pilot projects will determine the implementation program Embedded Data Collectors Mohammed A. Mulla NCDOT 8/13/2014 The AASHTO AII (TIG) program 28
30 Benefits Cost Eliminating over driving piles Detect pile tip damage Efficient (time) Embedded Data Collectors Mohammed A. Mulla NCDOT 8/13/2014 Improving safety Reuse existing foundation (future testing) 29
31 Thank You Very Much Embedded Data Collectors Mohammed A. Mulla NCDOT 8/13/
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