Microstructure of interfacial transition zone between PET fibres and cement paste

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F13%3A00485589" target="_blank" >RIV/67985891:_____/13:00485589 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.13168/AGG.2013.0012" target="_blank" >http://dx.doi.org/10.13168/AGG.2013.0012</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.13168/AGG.2013.0012" target="_blank" >10.13168/AGG.2013.0012</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure of interfacial transition zone between PET fibres and cement paste

Popis výsledku v původním jazyce

Considerable amount of waste in the form of polyethylene terephthalate (PET) bottles could be utilized in the form of dispersed microreinforcement in concrete. PET fibres, however, have poor wettability and adhesion to cement paste, which can be modified by alkaline hydrolysis with sodium hydroxide at elevated temperature. The alkaline treatment was used to increase fibre surface, which was followed by changes in the structure of the interfacial transition zone (ITZ) and interfacial bond between fibre and cementitious matrix. Raman microspectroscopy mapping was employed to study microstructural changes of ITZ within the distance 0 - 250 mu m from a PET fibre. The band at 357 cm(-1) corresponding to the Ca-O bond vibration in portlandite was used to determine its distribution. For determination of the relative abundance of ettringite, the SO42- stretching vibration at 987 cm(-1) was used. The most intensive bands of portlandite and ettringite were found within the distance 0 - 50 mu m from an unmodified PET fibre. Besides the elevated concentration of these minerals, abundant pores occur in this region. In the case of alkaline modified PET fibres the ITZ zone was not found.

Název v anglickém jazyce

Microstructure of interfacial transition zone between PET fibres and cement paste

Popis výsledku anglicky

Considerable amount of waste in the form of polyethylene terephthalate (PET) bottles could be utilized in the form of dispersed microreinforcement in concrete. PET fibres, however, have poor wettability and adhesion to cement paste, which can be modified by alkaline hydrolysis with sodium hydroxide at elevated temperature. The alkaline treatment was used to increase fibre surface, which was followed by changes in the structure of the interfacial transition zone (ITZ) and interfacial bond between fibre and cementitious matrix. Raman microspectroscopy mapping was employed to study microstructural changes of ITZ within the distance 0 - 250 mu m from a PET fibre. The band at 357 cm(-1) corresponding to the Ca-O bond vibration in portlandite was used to determine its distribution. For determination of the relative abundance of ettringite, the SO42- stretching vibration at 987 cm(-1) was used. The most intensive bands of portlandite and ettringite were found within the distance 0 - 50 mu m from an unmodified PET fibre. Besides the elevated concentration of these minerals, abundant pores occur in this region. In the case of alkaline modified PET fibres the ITZ zone was not found.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Acta geodynamica et geomaterialia

ISSN

1214-9705

e-ISSN

—

Svazek periodika

10

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

7

Strana od-do

121-127

Kód UT WoS článku

000320087700012

EID výsledku v databázi Scopus

2-s2.0-84874820349