Ceramics-Silikáty 52, (3) 172 - 182 (2008) |
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EFFECT OF AGING OF PET FIBRE ON THE MECHANICAL PROPERTIES OF PET FIBRE REINFORCED CEMENT COMPOSITE
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Machovič Vladimír 1,3, Andertová Jana 1, Kopecký Lubomír 2,
Černý Martin 3,
Borecká Lenka 3,
Přibyl Oldřich 3,
Kolář František 3,
Svítilová Jaroslava 3
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1 Institute of Chemical Technology Prague, Technická 5, 166 28, Prague, Czech Republic
2 Czech Technical University in Prague, Faculty of Civil Engineering, Thákurova 7, 166 29 Prague, Czech Republic
3 Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic,
V Holešoviè
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Keywords: Cement composite, PET fibre, Aging, Mechanical testing
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Poly(ethylene terephthalate) (PET) fibres have been used as a dispersed micro-reinforcement in a cementitious matrix. The
micro-reinforcement in the fibre reinforced concrete absorbs tensile strain and prevents formation of microcracks originating
from concrete shrinkage. The present work has been aimed at studying the effects of aging PET fibres by alkali hydrolysis and
temperature cycles on the compressive and flexural strength of the PET-cement composite. Using differential scanning
calorimetry, infrared spectroscopy and water vapour sorption, chemical changes of PET fibres after their degradation have
been characterized together with their effect on mechanical properties of the fibres and the resulting PET-cement composite.
It has been found that the flexural strength of the composite has been increased by alkali hydrolysis of PET fibres in sodium
hydroxide. |
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