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Evaluation of selected properties and surface quality of cured pre-impregnated carbon-fiber fabrics after exposure to sulphuric acid

Kojnoková Tatiana, Nový František, Markovičová Lenka, Harea Evgheni, Harea Evghenii

Production Engineering Archives

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2023

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Vol. 29, Iss. 1

1--6

EN

This paper deals with changes in selected properties of composite material and surface degradation after exposure to an acidic environment. A carbon fiber-reinforced composite (CFRP) produced from prepregs was tested. The weight change, micro-hardness, and surface degradation of the CFRP composite made of cured pre-impregnated laminates were evaluated in this study. Material consisting of a DT121R epoxy resin matrix with high reactivity and high viscosity, with two reinforcing carbon fabrics layers, is characterized by a low value of tensile strength. Evaluation of changes in the material properties was performed before and after exposure to specific environmental conditions, which are achieved by using a chemical solution of 15% H2SO4 at various temperatures. Subsequently, the effect of 15% H2SO4 at various temperatures on the material properties was monitored. The specimens were immersed in the solution for up to 3 and 6 weeks at the temperatures of 23°C, 40°C, and 60°C. It was found out, that the degradation of the composite material is conditioned by the aging of the epoxy resin (matrix). Carbon fibers (reinforcement) are relatively stable. The weight change, micro-hardness, and surface quality depend on the time of exposure to acidic solution and temperature. The micro-hardness tests show a significant influence on exposure time. The biggest changes in weight change and surface quality of the CFRP composite were observed after exposure at the temperature of 60°C.

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Tkaniny węglowe stosowane do budowy przewodów wodociągowych i kanalizacyjnych

Kubicka U., Bąba K.

Instal

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2018

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nr 4

58--60

PL

W artykule zaprezentowano tkaniny węglowe przeznaczone do budowy przewodów wodociągowych i kanalizacyjnych. Scharakteryzowano technologię InfinitPipe® pozwalającą przygotowywać rury bezpośrednio na placu budowy. Przedstawiono ich budowę, sposób wykonania, właściwości oraz możliwości zastosowania.

EN

Carbon fabrics for pipelying of water pipes and sewage systems have been presented in the paper. The method called InfinitPipe® to pipe production at the construction site has been discussed. The pipes construction, the manner of their execution, characteristics and advantages have been given.

3

Tkaniny węglowe w bezwykopowej odnowie przewodów wodociągowych i kanalizacyjnych

Kubicka U., Bąba K.

Instal

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2017

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nr 1

51--55

PL

W artykule zaprezentowano tkaniny węglowe przeznaczone do odnowy przewodów wodociągowych i kanalizacyjnych. Scharakteryzowano metodę WetLayup System – pierwszą, w której zastosowano te tkaniny. Ponadto omówiono powłoki StifPipeTM wykorzystujące materiał o strukturze plastra miodu oraz system FlexiTube ®. Dla każdej z metod scharakteryzowano budowę powłoki, sposób jej instalacji, właściwości oraz zalety i wady.

EN

Carbon fabrics for rehabilitation of water pipes and sewage systems have been presented in the paper. The first method called WetLayup System that uses FRP has been characterized. In addition, StifPipeTM coatings that use honeycomb material and FlexiTube® technology have been discussed. For each of the methods the construction of individual coatings, the manner of their execution, characteristics, advantages and disadvantages have been given.