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SUMMARY:'Long term performance of CFRP tendons in pretensioned structures'
  - Eleni Toumpanaki - PhD Student
DTSTART:20141017T143000Z
DTEND:20141017T150000Z
UID:TALK55213@talks.cam.ac.uk
CONTACT:Lorna Everett
DESCRIPTION:Carbon fibre reinforced polymers (CFRPs) are promising alterna
 tives to steel reinforcement for marine and offshore structures.  CFRPs do
  not corrode but\, in humid environments\, it is important to ensure that 
 the long-term durability of the CFRP is not adversely affected due to mois
 ture absorption in the epoxy-matrix material. This research project focuse
 s on two main issues: the long-term durability of the matrix dominated pro
 perties in CFRP reinforcement in isolation and the long-term bond performa
 nce between CFRP tendons and concrete in pretensioned structures. Exposure
  of CFRP tendons to moisture may be detrimental to matrix dominated proper
 ties such as bond strength\, creep and dowel strength. The bond failure be
 tween concrete and internal CFRP reinforcement lies mainly in the resin la
 yer of the CFRP. To take a conservative estimate of the matrix component d
 egradation in CFRP tendons\, samples were fully immersed in distilled wate
 r. Torsion tests were carried out over exposure time and the reduction in 
 torsional shear stiffness (matrix dominated property) was recorded. Next\,
  the long term performance of CFRP tendons was studied in a concrete envir
 onment by carrying out pull out tests in specimens immersed in water. The 
 exposure in water seems not to decrease significantly the bond strength in
  sand coated CFRP tendons embedded in high performance concrete. The quali
 ty of the sand coating layer seems to dominate the bond behaviour between 
  CFRP sand coated tendons and concrete. The need for better quality contro
 ls and standardisation in the manufacturing process is opportune and signi
 ficant to ensure consistency between design guidelines and structural appl
 ications.\n
LOCATION:Cambridge University Engineering Department\, LR5
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