Ceramics-Silikáty 52, (1) 54 - 60 (2008) |
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RAMAN MICRO-SPECTROSCOPY MAPPING AND MICROSTRUCTURAL AND MICROMECHANICAL STUDY OF INTERFACIAL TRANSITION ZONE IN CONCRETE REINFORCED BY POLY(ETHYLENE TEREPHTHALATE) FIBRES
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Machovič Vladimír 1,3, Kopecký Lubomír 1, Němeček Jiří 1,
Kolář František 3,
Svítilová Jaroslava 3,
Bittnar Zdeněk 2,
Andertová Jana 1
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1 Institute of Chemical Technology Prague, Technická 5, 166 28, Prague, Czech Republic
2 Faculty of Civil Engineering, Czech Technical University in Prague,
Thakurova 7, 166 29 Prague, Czech Republic
3 Institute of Rock Mechanic and Structure AS CR, V Holešoviè
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Keywords: Interfacial transition zone, Raman spectroscopy, Microstructure, PET fiber reinforcement
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A new application, the Raman microspectroscopy mapping technique, was successfully used to study of the interfacial transition
zone (ITZ) around poly(ethylene terephtalate) (PET) reinforcement in concrete. Waste from PET bottles has been used
in form of fibers as a reinforcing element in Portland cement concrete. Raman spectra represent the compositional variation
of the cement matrix within the distance range of 5 to 65 µm from the PET fibre. The Raman band at 357 cm⁻¹ corresponding
to the vibrations of Ca–O bond at Ca(OH)₂ was used for quantitative distribution of portlandite within the ITZ area. The most
intensive band of portlandite occurs at the distance from 0 to 30 µm from the PET fibre. Raman spectroscopy has been completed
with nanoindentation and environmental scanning electron microscopy (ESEM) in combination with microanalysis
(EDX), and electron diffraction (EBSD-OIM). The contact zone is characterized by a higher porosity (both air and water
pores) and occurrence of newly formed mineral phases - portlandite, hydrocarbonate, ettringite, and lower Ca²⁺ saturated
C–S–H gels. |
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