Corrosion-Free Precast Prestressed Concrete Piles Made ...
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Introduction Corrosion-Free Precast Prestressed Concrete Piles Made with Stainless Steel Reinforcement: Construction, Test and Evaluation Lorintz Gleich, Alvaro Paul, Lawrence Kahn (PI), Kimberly Kurtis, Preet Singh School of Civil and Environmental Engineering - Georgia Institute of Technology Acknowledgements This material is based upon work supported by Georgia Department of Transportation (GDOT) under Research Project No. 11-34. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of GDOT. Main Finding Precast prestressed concrete piles may be constructed with 2205 stainless steel 250 ksi low-relaxation strand and spiral, using the same procedures as used for conventional prestressing and wire reinforcement. Proposed Research GDOT Research Project No. 11-34 Next Activities of the Project The purpose of this research is to develop corrosion-free precast prestressed concrete piles which can be adopted for use in Georgia’s coastal, marine environment. The specific objectives are to prove that precast concrete piles constructed with high- strength stainless steel (HSSS) prestressing strand and spiral wire reinforcement and with high- durability concrete may be easily fabricated, driven without failure, designed using standard AASHTO LRFD provisions, and possess long-term durability. The research will provide specifications and design standards for corrosion-free piles for implementation by GDOT. Task 1: Experiment design and fabrication of piles and test specimens. Task 2: Driving of test piles and evaluation of driving performance. Task 3: Laboratory testing of piles, beams and quality control samples. Task 4: Monitoring of in-place piles to assess deterioration of concrete and corrosion of steel. Task 5: Development of design standards using high-strength stainless steel and high-performance concrete for marine environments. Piles and Specimens Construction The piles and test specimens were fabricated at Standard Concrete Company, Savannah, GA. Instrumentation for Transfer Length and Prestress Losses Durability Assessment - Drive and extract piles (Savannah, GA). - Flexure test and development length measurements (GT Structures Lab). HSSS Duplex alloy 2205 7-wire strand Piles and specimens*: 3 70-ft piles with HSSS. 2 70-ft piles with A417 steel. 2 27-ft piles with HSSS. 2 27-ft piles with A417 steel. 4 30-in specimens with HSSS. 4 30-in specimens with A417 steel. * All elements have a 16 in. square transversal section. Preliminary Results 0 50 100 150 200 250 300 350 400 450 500 0 5 10 15 20 25 30 35 40 Prestress Losses (microstarins) Time (days) #270 SS • Prestress Losses: • Transfer Length: Average #270: 19.5 inches Average HSSS: 18.2 inches 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 0 5 10 15 20 25 30 f' c (psi) Age (days) Concrete class AAA HPC w/c = 0.38 Material Properties 0 50 100 150 200 250 300 0 0.005 0.01 0.015 0.02 Stress (ksi) Strain (in/in) Flexure Test Beams
Transcript of Corrosion-Free Precast Prestressed Concrete Piles Made ...
Introduction
Corrosion-Free Precast Prestressed Concrete Piles Made with Stainless Steel Reinforcement:
Construction, Test and Evaluation
Lorintz Gleich, Alvaro Paul, Lawrence Kahn (PI), Kimberly Kurtis, Preet Singh School of Civil and Environmental Engineering - Georgia Institute of Technology
Acknowledgements
This material is based upon work supported by Georgia Department
of Transportation (GDOT) under Research Project No. 11-34. Any
opinions, findings, and conclusions or recommendations expressed
in this material are those of the authors and do not necessarily reflect
the views of GDOT.
Main Finding
Precast prestressed concrete piles may be constructed with 2205
stainless steel 250 ksi low-relaxation strand and spiral, using the
same procedures as used for conventional prestressing and wire
reinforcement.
Proposed Research
GDOT Research Project No. 11-34
Next Activities of the Project
The purpose of this research is to develop corrosion-free precast prestressed concrete
piles which can be adopted for use in Georgia’s coastal, marine environment.
The specific objectives are to prove that precast concrete piles constructed with high-
strength stainless steel (HSSS) prestressing strand and spiral wire reinforcement and with high-
durability concrete may be easily fabricated, driven without failure, designed using standard
AASHTO LRFD provisions, and possess long-term durability. The research will provide
specifications and design standards for corrosion-free piles for implementation by GDOT.
Task 1:
Experiment design and fabrication of
piles and test specimens.
Task 2:
Driving of test piles and evaluation of
driving performance.
Task 3:
Laboratory testing of piles, beams and quality
control samples.
Task 4:
Monitoring of in-place piles to assess
deterioration of concrete and corrosion of steel.
Task 5:
Development of design standards
using high-strength stainless steel
and high-performance concrete for
marine environments.
Piles and Specimens Construction
The piles and test specimens were fabricated at Standard Concrete Company, Savannah, GA.
Instrumentation for Transfer
Length and Prestress Losses
Durability Assessment
- Drive and extract piles (Savannah, GA).
- Flexure test and development length measurements
(GT Structures Lab).
HSSS
Duplex alloy 2205
7-wire strand
Piles and specimens*:
3 70-ft piles with HSSS.
2 70-ft piles with A417 steel.
2 27-ft piles with HSSS.
2 27-ft piles with A417 steel.
4 30-in specimens with HSSS.
4 30-in specimens with A417
steel.
* All elements have a 16 in.
square transversal section. Preliminary Results
0
50
100
150
200
250
300
350
400
450
500
0 5 10 15 20 25 30 35 40
Pre
str
ess L
osses (
mic
rosta
rin
s)
Time (days)
#270
SS
• Prestress Losses:
• Transfer Length: Average #270: 19.5 inches
Average HSSS: 18.2 inches
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
0 5 10 15 20 25 30
f'c (psi)
Age (days)
Concrete class
AAA HPC
w/c = 0.38
Material Properties
0
50
100
150
200
250
300
0 0.005 0.01 0.015 0.02
Stress
(ksi)
Strain (in/in)
Flexure Test Beams
