Durability of composites in aqueous environments

Helbling, Christoph; Karbhari, Vistasp M.

doi:10.1533/9781845693565.1.31

Cited by 7 publications

(4 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The degradation effect of moisture on composite materials can be understood by considering its effect on the constituent elements of the system, which are the fibre, the matrix and the fibre-matrix interphase. The absorption of moisture mainly damages the resin, which may lead to changes in the structure of the polymer [ 13 ]. Nevertheless, moisture can also deteriorate the interphase fibre-matrix, by reducing the fibre-matrix bond, and lead to the degradation at the fibre level.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding chemical ageing, it can occur after longer exposure to moisture. This is mostly an irreversible process of degradation which occurs in all constituent elements of the system (fibre, matrix and interface fibre-matrix) [ 13 ]. Finally, the mechanical degradation may result from the combination of different chemical and physical mechanisms, as swelling leads to microcracking in the weakened resin after hydrolysis as well as debonding effects at the interface [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Durability of Epoxy Adhesives and Carbon Fibre Reinforced Polymer Laminates Used in Strengthening Systems: Accelerated Ageing versus Natural Ageing

et al. 2021

View full text Add to dashboard Cite

This work addresses the durability of structural epoxy adhesives and carbon fibre reinforced polymer (CFRP) laminates typically used in strengthening of existing reinforced concrete structures exposed to natural ageing. The experimental program included four natural (real) outdoor environments inducing ageing mainly caused by carbonation, freeze-thaw attack, elevated temperatures, and airborne chlorides from seawater. Moreover, a control (reference) environment (20 °C of temperature and 55% of relative humidity) and an environment involving water immersion of the materials under controlled temperature (20 °C of temperature) were also included in this investigation. The characterization involved the assessment of the physical, chemical and mechanical properties along a study period of up to two years. Furthermore, comparisons between the natural ageing tests developed in the scope of the present work and accelerated ageing tests existing in the literature were performed. Regarding to the epoxy adhesives, an increase in the glass transition temperature with the time was observed, while the tensile properties decreased, regardless of the outdoor environment. The CFRP laminates were marginally affected by the studied environments. Despite the remarkable dispersion of the results observed in the accelerated ageing tests for the period investigated, this testing protocol yielded higher mechanical degradation than under natural ageing.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Durability of Epoxy Adhesives and Carbon Fibre Reinforced Polymer Laminates Used in Strengthening Systems: Accelerated Ageing versus Natural Ageing

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Capillary action may cause molecules of water to seep into the composite fiber-matrix interface. A hydrolysis reaction of unsaturated groups within the resin could cause degradation of polyester resin and the interface of fiber and matrix (HELBLING & KARBHARI, 2007). As presented in Table 2, for an immersion period of 180 days, the retention rate of flexural strength is observed to be at 91% for a composite with 50 wt.% glass fiber in comparison to 86 & 84% for composites with 40 and 30 weight percentages, respectively.…”

Section: Flexural Strengthmentioning

confidence: 97%

Durability prediction analysis on mechanical properties of GFRP upon immersion in water at ambient temperature

et al. 2021

View full text Add to dashboard Cite

In this article, the influence of varying the weight percentage of glass fiber on the water uptake, tensile and flexural strengths of glass fiber-polyester composites are evaluated. The composites are fabricated by hand lay-up process and further subjected to water immersion for a varied time period (between 0 and 180 days) at ambient temperature. Tests for Tensile and flexural strengths are conducted according to the specifications of ASTM. The test results indicate that the increase in the weight percentage of glass fiber enhanced the tensile strength (by 9-17%) and flexural strength (by 10-17%). Higher retention rates of tensile and flexural strengths are detected at higher weight percentages of glass fiber. An 86% retention rate of tensile strength and a 92% retention rate of flexural strength is detected with 50 wt.% glass fiber reinforced, water immersed specimen. The causes for the failure of specimens under tensile load are discovered with the help of SEM images. The experimental data and the data generated by the ExpDec1 model are significantly closer to each other, which indicates that the ExpDec1 model can be used for predicting the values based on the days of immersion.

show abstract

“…Fibre/polymer composites have a long history of use in marine vessels, piping, corrosion equipment and underground storage tanks; anecdotal evidence and limited testing show that they can be successfully engineered to have a long service life in contact with moisture and aqueous solutions (Helbling and Karbhari, 2007). Durability and dynamic failure properties are critical parameters for fibre/polymer composite in seawater.…”

Section: Seawater Environmentsmentioning

confidence: 99%

Advanced fibre-reinforced polymer (FRP) composite materials for sustainable energy technologies

Hollaway

2013

Advanced Fibre-Reinforced Polymer (FRP) Composites for Structural Applications

View full text Add to dashboard Cite

Durability of composites in aqueous environments

Cited by 7 publications

References 43 publications

Durability of Epoxy Adhesives and Carbon Fibre Reinforced Polymer Laminates Used in Strengthening Systems: Accelerated Ageing versus Natural Ageing

Durability of Epoxy Adhesives and Carbon Fibre Reinforced Polymer Laminates Used in Strengthening Systems: Accelerated Ageing versus Natural Ageing

Durability prediction analysis on mechanical properties of GFRP upon immersion in water at ambient temperature

Advanced fibre-reinforced polymer (FRP) composite materials for sustainable energy technologies

Contact Info

Product

Resources

About