TY - JOUR
T1 - Synthesis, solubility and thermodynamic properties of N-A-S-H gels with various target Si/Al ratios
AU - Chen, Yun
AU - de Lima, Luiz Miranda
AU - Li, Zhenming
AU - Ma, Bin
AU - Lothenbach, Barbara
AU - Yin, Suhong
AU - Yu, Qijun
AU - Ye, Guang
PY - 2024
Y1 - 2024
N2 - The synthesis of N-A-S-H gel with high Si/Al ratios (>2) has been rarely reported in the literature, leaving the establishment of a reliable synthesis route as an open challenge. This paper aims to synthesize N-A-S-H gels with Si/Al ratios ranging from 1 to 3 and establish their thermodynamic database. The effects of reaction temperature, reaction time, initial Si/Al, concentration of reactants and pH of the matrix on the Si/Al ratios of the synthesized N-A-S-H gel were investigated. Results showed that N-A-S-H gels with target Si/Al ratios can be synthesized by controlling the concentration of reactants, pH and initial Si/Al ratios. The solubility products of the obtained N-A-S-H gels were determined via dissolution tests at different temperatures, to determine thermodynamic data. The development of this experimentally derived thermodynamic database of N-A-S-H gels constitutes a crucial step in the advancement of thermodynamic modeling of geopolymer, providing valuable insight into geopolymer reactions and phase assemblages.
AB - The synthesis of N-A-S-H gel with high Si/Al ratios (>2) has been rarely reported in the literature, leaving the establishment of a reliable synthesis route as an open challenge. This paper aims to synthesize N-A-S-H gels with Si/Al ratios ranging from 1 to 3 and establish their thermodynamic database. The effects of reaction temperature, reaction time, initial Si/Al, concentration of reactants and pH of the matrix on the Si/Al ratios of the synthesized N-A-S-H gel were investigated. Results showed that N-A-S-H gels with target Si/Al ratios can be synthesized by controlling the concentration of reactants, pH and initial Si/Al ratios. The solubility products of the obtained N-A-S-H gels were determined via dissolution tests at different temperatures, to determine thermodynamic data. The development of this experimentally derived thermodynamic database of N-A-S-H gels constitutes a crucial step in the advancement of thermodynamic modeling of geopolymer, providing valuable insight into geopolymer reactions and phase assemblages.
KW - N-A-S-H gel
KW - Si/Al ratio
KW - Sol-gel method
KW - Solubility product
KW - Thermodynamic properties
UR - http://www.scopus.com/inward/record.url?scp=85189104468&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2024.107484
DO - 10.1016/j.cemconres.2024.107484
M3 - Article
AN - SCOPUS:85189104468
SN - 0008-8846
VL - 180
JO - Cement and Concrete Research
JF - Cement and Concrete Research
M1 - 107484
ER -