Shear Modulus of Cylindrical CFRP Tendons Exposed to Moisture

Eleni Toumpanaki; Janet Lees; Giovanni Terrasi

doi:10.1061/(ASCE)CC.1943-5614.0000521

Shear Modulus of Cylindrical CFRP Tendons Exposed to Moisture

Eleni Toumpanaki, Janet Lees, Giovanni Terrasi

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Abstract

Two groups of cylindrical carbon fiber-reinforced polymer (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 characterize 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.

Original language	English
Article number	04014059
Number of pages	12
Journal	Journal of Composites for Construction
Volume	19
Issue number	3
Early online date	2 Sep 2014
DOIs	https://doi.org/10.1061/(ASCE)CC.1943-5614.0000521
Publication status	Published - 1 Jun 2015

Keywords

Carbon fiber reinforced polymer
Durability
Prediction model

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10.1061/(ASCE)CC.1943-5614.0000521

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This is the author accepted manuscript (AAM). The final published version (version of record) is available online via American Society of Civil Engineers at https://ascelibrary.org/doi/10.1061/%28ASCE%29CC.1943-5614.0000521. Please refer to any applicable terms of use of the publisher.
Accepted author manuscript, 2.12 MB

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Dr Eleni Toumpanaki
- eleni.toumpanaki@bristol.ac.uk
- Department of Civil Engineering - Lecturer
- Cabot Institute for the Environment
Person: Academic , Member

Cite this

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title = "Shear Modulus of Cylindrical CFRP Tendons Exposed to Moisture",

abstract = "Two groups of cylindrical carbon fiber-reinforced polymer (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 characterize 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.",

keywords = "Carbon fiber reinforced polymer, Durability, Prediction model",

author = "Eleni Toumpanaki and Janet Lees and Giovanni Terrasi",

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T1 - Shear Modulus of Cylindrical CFRP Tendons Exposed to Moisture

AU - Toumpanaki, Eleni

AU - Lees, Janet

AU - Terrasi, Giovanni

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Y1 - 2015/6/1

N2 - Two groups of cylindrical carbon fiber-reinforced polymer (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 characterize 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.

AB - Two groups of cylindrical carbon fiber-reinforced polymer (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 characterize 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.

KW - Carbon fiber reinforced polymer

KW - Durability

KW - Prediction model

U2 - 10.1061/(ASCE)CC.1943-5614.0000521

DO - 10.1061/(ASCE)CC.1943-5614.0000521

M3 - Article (Academic Journal)

VL - 19

JO - Journal of Composites for Construction

JF - Journal of Composites for Construction

SN - 1090-0268

IS - 3

M1 - 04014059

ER -

Shear Modulus of Cylindrical CFRP Tendons Exposed to Moisture

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Keywords

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Dr Eleni Toumpanaki

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