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Shear modulus of cylindrical cfrp tendons exposed to moisture

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Toumpanaki, E 
Lees, JM 
Terrasi, GP 


Two groups of cylindrical CFRP tendons were exposed in distilled water at 23°C and 60 °C to study the diffusion mechanisms and the effect of moisture uptake on the tendon shear modulus. The two tendon groups had different manufacturing processes, so DMA tests and optical microscopy were used to help characterise the materials. Mass uptake readings of tendon samples were recorded and the uptake generally agreed with Fickian predictions. To study the time-dependent changes in the matrix stiffness due to exposure, torsion tests within the elastic range of loading were conducted. The tendon shear modulus was then derived from the torque versus twist plots. For both groups of tendons the measured shear modulus decreased due to exposure in water. A long-term shear modulus prediction model was developed to relate the tendon torsional shear stiffness and the moisture concentration and the results appeared to agree well with the experimental findings.



Carbon fiber reinforced polymer, Durability, Prediction model

Journal Title

Journal of Composites for Construction

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American Society of Civil Engineers (ASCE)
We are grateful to SACAC for their technical and financial support. We also appreciate the financial support from the Onassis Foundation.