Effects of UV radiation, moisture and elevated temperature on mechanical properties of GFRP pultruded profiles

Milad Bazli, Armin Jafari, Hamed Ashrafi, Xiao-Ling Zhao, Yu Bai, R. K. Singh Raman

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The present research examines the effects of UV radiation, moisture and elevated temperature on the mechanical properties of GFRP pultruded profiles. Flexural, compressive and tensile properties of different GFRP sections were studied after they were exposed for 1000, 1500, 2000 and 3000 h to UV radiation and water vapour condensation cycles. Mechanical tests, including three-point bending, compression and tension tests, SEM analyses, and statistical studies were conducted to gather comprehensive results. The results showed that the mechanical properties of various GFRP sections generally decreased with the duration of conditioning: however, the rate of the decrease that was only slight up to 1000 h, increased rapidly during 1000–2000 h, and again it was slow during 2000–3000 h. The maximum reductions were 34%, 28% and 23% after exposure to 3000 h cycles for bending, tensile and compression tests, respectively. In the bending tests, where inter-laminar shear failure controls ultimate strength, the degradation was greater compared to the situation where fibres fracture controls the failure. Further, regarding the cross-section parameter, it was concluded that the thickness and perimeter are the effective factors; the thinner the sample and the larger the perimeter, the greater is the reduction. However, the maximum effect of the cross section in terms of thickness and perimeter did not exceed 13% among all sections.

Original languageEnglish
Article number117137
Number of pages19
JournalConstruction and Building Materials
Volume231
DOIs
Publication statusPublished - 20 Jan 2020

Keywords

  • Degradation mechanism
  • GFRP pultruded sections
  • Hydrothermal condition
  • Mechanical properties
  • UV radiation

Cite this

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title = "Effects of UV radiation, moisture and elevated temperature on mechanical properties of GFRP pultruded profiles",
abstract = "The present research examines the effects of UV radiation, moisture and elevated temperature on the mechanical properties of GFRP pultruded profiles. Flexural, compressive and tensile properties of different GFRP sections were studied after they were exposed for 1000, 1500, 2000 and 3000 h to UV radiation and water vapour condensation cycles. Mechanical tests, including three-point bending, compression and tension tests, SEM analyses, and statistical studies were conducted to gather comprehensive results. The results showed that the mechanical properties of various GFRP sections generally decreased with the duration of conditioning: however, the rate of the decrease that was only slight up to 1000 h, increased rapidly during 1000–2000 h, and again it was slow during 2000–3000 h. The maximum reductions were 34{\%}, 28{\%} and 23{\%} after exposure to 3000 h cycles for bending, tensile and compression tests, respectively. In the bending tests, where inter-laminar shear failure controls ultimate strength, the degradation was greater compared to the situation where fibres fracture controls the failure. Further, regarding the cross-section parameter, it was concluded that the thickness and perimeter are the effective factors; the thinner the sample and the larger the perimeter, the greater is the reduction. However, the maximum effect of the cross section in terms of thickness and perimeter did not exceed 13{\%} among all sections.",
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Effects of UV radiation, moisture and elevated temperature on mechanical properties of GFRP pultruded profiles. / Bazli, Milad; Jafari, Armin; Ashrafi, Hamed; Zhao, Xiao-Ling; Bai, Yu; Singh Raman, R. K.

In: Construction and Building Materials, Vol. 231, 117137, 20.01.2020.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Singh Raman, R. K.

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