Role of Al in the crystal growth of alkali-activated fly ash and slag under a hydrothermal condition

S. J. Bae; Solmoi Park; H. K. Lee

doi:10.1016/j.conbuildmat.2019.117842

Role of Al in the crystal growth of alkali-activated fly ash and slag under a hydrothermal condition

S. J. Bae, Solmoi Park, H. K. Lee

Korea Advanced Institute of Science and Technology

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

23 Scopus citations

Abstract

The present study investigates the role of Al in the evolution of the crystalline phases of an alkali-activated binder. Samples were synthesized corresponding to the binder composition with various Al₂O₃/Na₂O and MgO/binder ratios in a hydrothermal condition. Thermodynamic modelling was carried out to predict the effect of the Al content in the binder composition on the formation of Al-bearing phases. The test results showed that an increasing Al content led to the alteration of the predominant zeolite phases in the alkali-activated binder. In addition, MgO incorporation enhanced the reaction degree of hydration in the alkali-activated system and the crystal growth, specifically hydrotalcite-like phase. Consequently, the formed reaction products had a great effect on the pore characteristics of the alkali-activated binder given their variations in the crystal structure.

Original language	English
Article number	117842
Journal	Construction and Building Materials
Volume	239
DOIs	https://doi.org/10.1016/j.conbuildmat.2019.117842
State	Published - 10 Apr 2020
Externally published	Yes

Keywords

AlO
Alkali-activated binder
Characterization
Hydrotalcite
Hydrothermal condition
MgO
Thermodynamic modeling
Zeolite

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10.1016/j.conbuildmat.2019.117842

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title = "Role of Al in the crystal growth of alkali-activated fly ash and slag under a hydrothermal condition",

abstract = "The present study investigates the role of Al in the evolution of the crystalline phases of an alkali-activated binder. Samples were synthesized corresponding to the binder composition with various Al2O3/Na2O and MgO/binder ratios in a hydrothermal condition. Thermodynamic modelling was carried out to predict the effect of the Al content in the binder composition on the formation of Al-bearing phases. The test results showed that an increasing Al content led to the alteration of the predominant zeolite phases in the alkali-activated binder. In addition, MgO incorporation enhanced the reaction degree of hydration in the alkali-activated system and the crystal growth, specifically hydrotalcite-like phase. Consequently, the formed reaction products had a great effect on the pore characteristics of the alkali-activated binder given their variations in the crystal structure.",

keywords = "AlO, Alkali-activated binder, Characterization, Hydrotalcite, Hydrothermal condition, MgO, Thermodynamic modeling, Zeolite",

author = "Bae, \{S. J.\} and Solmoi Park and Lee, \{H. K.\}",

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doi = "10.1016/j.conbuildmat.2019.117842",

language = "English",

volume = "239",

journal = "Construction and Building Materials",

issn = "0950-0618",

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TY - JOUR

T1 - Role of Al in the crystal growth of alkali-activated fly ash and slag under a hydrothermal condition

AU - Bae, S. J.

AU - Park, Solmoi

AU - Lee, H. K.

PY - 2020/4/10

Y1 - 2020/4/10

N2 - The present study investigates the role of Al in the evolution of the crystalline phases of an alkali-activated binder. Samples were synthesized corresponding to the binder composition with various Al2O3/Na2O and MgO/binder ratios in a hydrothermal condition. Thermodynamic modelling was carried out to predict the effect of the Al content in the binder composition on the formation of Al-bearing phases. The test results showed that an increasing Al content led to the alteration of the predominant zeolite phases in the alkali-activated binder. In addition, MgO incorporation enhanced the reaction degree of hydration in the alkali-activated system and the crystal growth, specifically hydrotalcite-like phase. Consequently, the formed reaction products had a great effect on the pore characteristics of the alkali-activated binder given their variations in the crystal structure.

AB - The present study investigates the role of Al in the evolution of the crystalline phases of an alkali-activated binder. Samples were synthesized corresponding to the binder composition with various Al2O3/Na2O and MgO/binder ratios in a hydrothermal condition. Thermodynamic modelling was carried out to predict the effect of the Al content in the binder composition on the formation of Al-bearing phases. The test results showed that an increasing Al content led to the alteration of the predominant zeolite phases in the alkali-activated binder. In addition, MgO incorporation enhanced the reaction degree of hydration in the alkali-activated system and the crystal growth, specifically hydrotalcite-like phase. Consequently, the formed reaction products had a great effect on the pore characteristics of the alkali-activated binder given their variations in the crystal structure.

KW - AlO

KW - Alkali-activated binder

KW - Characterization

KW - Hydrotalcite

KW - Hydrothermal condition

KW - MgO

KW - Thermodynamic modeling

KW - Zeolite

UR - https://www.scopus.com/pages/publications/85076713011

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DO - 10.1016/j.conbuildmat.2019.117842

M3 - Article

AN - SCOPUS:85076713011

SN - 0950-0618

VL - 239

JO - Construction and Building Materials

JF - Construction and Building Materials

M1 - 117842

ER -

Role of Al in the crystal growth of alkali-activated fly ash and slag under a hydrothermal condition

Abstract

Keywords

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