Details:

Creators:
Roddenberry, Michelle ; Mtenga, Primus ; Joshi, Kunal
Roddenberry, Michelle ; Mtenga, Primus ; Joshi, Kunal Less -
Corporate Creators:
Florida Agricultural and Mechanical University. Dept. of Civil and Environmental Engineering
Subject/TRT Terms:
[+]
Bridge Foundations Cables Carbon Fibers Corrosion Resistant Materials Fiber Composites Laboratory Tests Piles (Supports) Prestressed Concrete Reinforcement (Engineering)
Publication/ Report Number:
BDK83-977-17 ; 31045
BDK83-977-17 ; 31045 Less -
Resource Type:
Tech Report
Geographical Coverage:
Florida
Corporate Publisher:
Florida. Dept. of Transportation
Abstract:
The Florida Department of Transportation (FDOT) commonly uses prestressed concrete piles in

bridge foundations. These piles are prestressed with steel strands that, when installed in aggressive or

marine environments, are subject to corrosion and therefore rapid degradation. Many solutions may

address this issue, but they are not long-term. Hence, it would be desirable to use advanced materials

that do not corrode. The goal of this research was to assess the suitability of using carbon fiber

composite cables (CFCC), which do not corrode, in lieu of conventional steel prestressing strands.

Five (5) 24-in. square prestressed concrete piles, three (3) 40-ft long and two (2) 100-ft long,

were cast using 0.6-in. diameter CFCC strands produced by Tokyo Rope Manufacturing Company. A

special anchoring system was used because CFCC strands cannot be conventionally gripped using

wedges and a jack. The techniques employed to prestress these strands were documented, as well as the

unique aspects involved in constructing and precasting CFCC-prestressed piles. During strand

detensioning, stresses were monitored in the concrete at the piles' ends to determine the transfer length

of CFCC strands, as a means of evaluating their bond characteristics.

Development length tests and flexural tests were performed on two (2) of the 40-ft piles at the

FDOT Marcus H. Ansley Structures Research Center to further assess the performance of the CFCC

strands. Lastly, the two (2) 100-ft piles were driven at a bridge construction site, adjacent to standard

steel-prestressed concrete piles. During driving operations, the behavior of the piles was monitored

using embedded data collectors and a Pile Driving Analyzer®.

The precasting efforts and test results show that the performance of piles prestressed with CFCC

strands is comparable to those prestressed with steel. Using CFCC strands in prestressed concrete piles

for bridge foundations, particularly in harsh environments, could potentially result in bridges that

require less maintenance and have longer lifespans.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:4c0aa2cb1af322b477046630abf0b996aaa6ed707ecc46c73f1a4e1cb699b3f7
Download URL:
https://rosap.ntl.bts.gov/view/dot/27245/dot_27245_DS1.pdf
File Type:

Supporting Files

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