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Thermophysical and mechanical properties of fiber‐reinforced composite material subjected to high temperatures

    Eva Vejmelková Affiliation
    ; Petr Konvalinka Affiliation
    ; Pavel Padevět Affiliation
    ; Robert Černý Affiliation

Abstract

The bulk density, open porosity, matrix density, tensile strength, bending strength, thermal diffusivity, specific heat capacity, thermal conductivity and linear thermal expansion coefficient of high‐density glass fiber reinforced cement composite are determined as functions of temperature up to 1000 °C. The basic physical parameters and mechanical parameters are found to exhibit the most important changes between the reference state and 600 °C pre‐heating where the increase of porosity is as high as 40% and both the tensile strength and bending strength decrease to about one third of their original values. The measured dependences of thermal diffusivity and thermal conductivity on temperature indicate that the heat transfer in the studied material is accelerated once temperature achieves 500–600 °C but the change in heat storage expressed by the specific heat capacity is less important. The linear thermal expansion coefficient is not found to be affected by high temperatures in a negative way; it is either lower or comparable to its low‐temperature values.


Santrauka


Tiriama, kaip kinta tankiojo stiklo pluoštu armuoto cementinio kompozito tankis, atvirasis poringumas, matricinis tankis, tempiamasis bei lenkiamasis stipris, terminis laidumas, savitasis šilumos imlumas, savitasis šilumos laidumas ir tiesinis terminio pletimosi koeficientas, kai šia medžiaga veikia temperatūra, kylanti iki 1000 °C. Rasta, kad pagrindiniai fiziniai ir mechaniniai parametrai daugiausia keičiasi temperatūrai kylant nuo pradines iki 600 °C. Šioje temperatūros kilimo atkarpoje poringumas išaugo iki 40 %, o tempiamasis ir lenkiamasis stipriai sumažejo maždaug trečdaliu, palyginti su pradinemis reikšmemis. Išmatuotoji terminio laidumo ir savitojo šilumos laidumo priklausomybe nuo temperatūros rodo, kad šilumos perdavimas tiriamoje medžiagoje pagreiteja temperatūrai pasiekus 500–600 °C, tačiau šilumos kaupimas, išreikštas savituoju šilumos imlumu, yra ne toks svarbus. Nenustatyta, kad tiesinis terminio pletimosi koeficientas būtu neigiamai veikiamas aukštos temperatūros. Šio koeficiento reikšmes yra mažesnes arba maždaug lygios reikšmems, išmatuotoms žemoje temperatūroje.


First Published Online: 10 Feb 2011


Reikšminiai žodžiai: stiklo pluoštu stiprinti cemento kompozitaiaukšta temperatūratempiamasis stiprislenkiamasis stipristerminis laidumassavitasis šilumos imlumassavitasis šilumos laidumastiesinis terminio pletimosi koeficientas

Keyword : glass-fiber reinforced cement composites, high temperatures, tensile strength, bending strength, thermal diffusivity, specific heat capacity, thermal conductivity, linear thermal expansion coefficient

How to Cite
Vejmelková, E., Konvalinka, P., Padevět, P., & Černý, R. (2010). Thermophysical and mechanical properties of fiber‐reinforced composite material subjected to high temperatures. Journal of Civil Engineering and Management, 16(3), 395-400. https://doi.org/10.3846/jcem.2010.45
Published in Issue
Sep 30, 2010
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