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.

中文翻译：

---

具有不同目标硅铝比的 NASH 凝胶的合成、溶解度和热力学性质

高硅铝比（>2）的 NASH 凝胶的合成在文献中很少报道，这使得建立可靠的合成路线成为一个开放的挑战。本文旨在合成硅铝比为1~3的NASH凝胶并建立其热力学数据库。研究了反应温度、反应时间、初始Si/Al、反应物浓度和基质pH值对合成NASH凝胶Si/Al比的影响。结果表明，通过控制反应物浓度、pH值和初始Si/Al比，可以合成具有目标Si/Al比的NASH凝胶。通过不同温度下的溶出测试测定获得的 NASH 凝胶的溶度积，以确定热力学数据。这种通过实验得出的 NASH 凝胶热力学数据库的开发构成了地质聚合物热力学建模进步的关键一步，为地质聚合物反应和相组合提供了宝贵的见解。