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SUMMARY:'Effect of Moisture Uptake on the Shear Stiffness of CFRP Tendons 
 and the Role of the Manufacturing Route' - Eleni Toumpanaki – PhD Studen
 t
DTSTART:20130531T143000Z
DTEND:20130531T150000Z
UID:TALK45640@talks.cam.ac.uk
CONTACT:Lorna Everett
DESCRIPTION:The influence of moisture uptake on the shear stiffness of car
 bon fibre reinforced (CFRP) tendons is important for CFRP prestressed conc
 rete off-shore applications. To evaluate the shear stiffness degradation\,
  torsion tests were conducted (in accordance with the ASTM E143-02 standar
 d) on cylindrical CFRP tendons subjected to different moisture environment
 s. A torsion test was considered to be advantageous since it facilitates a
  direct interpretation of the matrix dominated degradation properties. Two
  different diameter CFRP tendons with similar resin properties were tested
 . \n\n \n\nThe smaller diameter tendons were smooth whereas the larger dia
 meter tendons were originally sand coated but the coating was manually scr
 aped off. The 300 mm long CFRP tendon sections were dried in an oven at 60
 °C and were then immersed in distilled water at 20°C. To avoid a prematu
 re failure in the clamping areas\, only the central 200 mm length was expo
 sed. The shear stiffness of the tendons was regularly measured by conducti
 ng torsion tests over exposure time. It was found that the measured torsio
 nal shear stiffness decreased with exposure time for both groups of CFRP t
 endons. The degree of degradation was higher for the smaller diameter tend
 ons. The difference in the degradation and moisture uptake rate between th
 e two groups of CFRP tendons are attributed to the different manufacturing
  routes. The degree of curing and the void growth during the pultrusion ma
 nufacturing process are being investigated.\n\n
LOCATION:Cambridge University Engineering Department\, LR3B
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