Degree of reactivity of two kaolinitic minerals in alkali solution using zeolitic tuff or silica sand filler

Rushdi I. Yousef; Bassam El-Eswed; Mazen Alshaaer; Fawwaz Khalili; Hubert Rahier

doi:10.1016/j.ceramint.2012.03.008

Degree of reactivity of two kaolinitic minerals in alkali solution using zeolitic tuff or silica sand filler

Rushdi I. Yousef, Bassam El-Eswed, Mazen Alshaaer, Fawwaz Khalili, Hubert Rahier

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

Four geopolymers were synthesized by NaOH-activation of a mixture of kaolinite (Jordanian kaolinite or Ukrainian kaolinite) and a filler (zeolitic tuff or silica sand). X-ray powder diffraction (XRD), Fourier-transform infrared spectrometry (FTIR), and solid-state magic angle spinning nuclear magnetic resonance (MAS-NMR) were employed to monitor the extent of reaction and to characterize the phases in the geopolymer. Remaining kaolinite in all produced geopolymer specimens unambiguously indicated an incomplete reaction. The ²⁹Si MAS-NMR spectra of the geopolymers revealed the presence of tetrahedral-SiO ₄ whereas the ²⁷Al MAS-NMR spectra revealed the presence of both tetrahedral-AlO ₄ and octahedral-AlO ₆. The XRD patterns of geopolymers showed the formation of a new feldspar mineral. Replacing silica sand filler by zeolitic tuff enhanced markedly the specific surface area of the corresponding geopolymers.

Original language	English
Pages (from-to)	5061-5067
Number of pages	7
Journal	Ceramics International
Volume	38
Issue number	6
DOIs	https://doi.org/10.1016/j.ceramint.2012.03.008
State	Published - Aug 2012
Externally published	Yes

Keywords

Geopolymers
Inorganic polymers
Kaolinite
Zeolitic tuff

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10.1016/j.ceramint.2012.03.008

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title = "Degree of reactivity of two kaolinitic minerals in alkali solution using zeolitic tuff or silica sand filler",

abstract = "Four geopolymers were synthesized by NaOH-activation of a mixture of kaolinite (Jordanian kaolinite or Ukrainian kaolinite) and a filler (zeolitic tuff or silica sand). X-ray powder diffraction (XRD), Fourier-transform infrared spectrometry (FTIR), and solid-state magic angle spinning nuclear magnetic resonance (MAS-NMR) were employed to monitor the extent of reaction and to characterize the phases in the geopolymer. Remaining kaolinite in all produced geopolymer specimens unambiguously indicated an incomplete reaction. The 29Si MAS-NMR spectra of the geopolymers revealed the presence of tetrahedral-SiO 4 whereas the 27Al MAS-NMR spectra revealed the presence of both tetrahedral-AlO 4 and octahedral-AlO 6. The XRD patterns of geopolymers showed the formation of a new feldspar mineral. Replacing silica sand filler by zeolitic tuff enhanced markedly the specific surface area of the corresponding geopolymers.",

keywords = "Geopolymers, Inorganic polymers, Kaolinite, Zeolitic tuff",

author = "Yousef, \{Rushdi I.\} and Bassam El-Eswed and Mazen Alshaaer and Fawwaz Khalili and Hubert Rahier",

year = "2012",

month = aug,

doi = "10.1016/j.ceramint.2012.03.008",

language = "English",

volume = "38",

pages = "5061--5067",

journal = "Ceramics International",

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TY - JOUR

T1 - Degree of reactivity of two kaolinitic minerals in alkali solution using zeolitic tuff or silica sand filler

AU - Yousef, Rushdi I.

AU - El-Eswed, Bassam

AU - Alshaaer, Mazen

AU - Khalili, Fawwaz

AU - Rahier, Hubert

PY - 2012/8

Y1 - 2012/8

N2 - Four geopolymers were synthesized by NaOH-activation of a mixture of kaolinite (Jordanian kaolinite or Ukrainian kaolinite) and a filler (zeolitic tuff or silica sand). X-ray powder diffraction (XRD), Fourier-transform infrared spectrometry (FTIR), and solid-state magic angle spinning nuclear magnetic resonance (MAS-NMR) were employed to monitor the extent of reaction and to characterize the phases in the geopolymer. Remaining kaolinite in all produced geopolymer specimens unambiguously indicated an incomplete reaction. The 29Si MAS-NMR spectra of the geopolymers revealed the presence of tetrahedral-SiO 4 whereas the 27Al MAS-NMR spectra revealed the presence of both tetrahedral-AlO 4 and octahedral-AlO 6. The XRD patterns of geopolymers showed the formation of a new feldspar mineral. Replacing silica sand filler by zeolitic tuff enhanced markedly the specific surface area of the corresponding geopolymers.

AB - Four geopolymers were synthesized by NaOH-activation of a mixture of kaolinite (Jordanian kaolinite or Ukrainian kaolinite) and a filler (zeolitic tuff or silica sand). X-ray powder diffraction (XRD), Fourier-transform infrared spectrometry (FTIR), and solid-state magic angle spinning nuclear magnetic resonance (MAS-NMR) were employed to monitor the extent of reaction and to characterize the phases in the geopolymer. Remaining kaolinite in all produced geopolymer specimens unambiguously indicated an incomplete reaction. The 29Si MAS-NMR spectra of the geopolymers revealed the presence of tetrahedral-SiO 4 whereas the 27Al MAS-NMR spectra revealed the presence of both tetrahedral-AlO 4 and octahedral-AlO 6. The XRD patterns of geopolymers showed the formation of a new feldspar mineral. Replacing silica sand filler by zeolitic tuff enhanced markedly the specific surface area of the corresponding geopolymers.

KW - Geopolymers

KW - Inorganic polymers

KW - Kaolinite

KW - Zeolitic tuff

UR - http://www.scopus.com/inward/record.url?scp=84861349148&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2012.03.008

DO - 10.1016/j.ceramint.2012.03.008

M3 - Article

AN - SCOPUS:84861349148

SN - 0272-8842

VL - 38

SP - 5061

EP - 5067

JO - Ceramics International

JF - Ceramics International

IS - 6

ER -

Degree of reactivity of two kaolinitic minerals in alkali solution using zeolitic tuff or silica sand filler

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Keywords

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