Calcium sodium aluminosilicate hydrate C-(N-)A-S-H gels, formed through the alkali-activation of calcium silicate-based materials, may exhibit greater susceptibility to aqueous environments when compared to traditional C-(A-)S-H phases formed by hydration of blended Portland cements. This study investigates structural changes in synthesized C-(N-)A-S-H gels triggered by water immersion. Three gels have been examined, each with stoichiometrically controlled ratios of Ca/Si (0.8 and 1.2), Al/Si (0.1 and 0.3), and Na/Si (0.1, 0.2, and 0.3). The gel with a higher Ca/Si ratio demonstrated enhanced resistance to water leaching and only experienced marginal decalcification whereas the gels with lower Ca/Si ratios exhibited more pronounced effects including leaching losses of Si. Notably, all gels displayed rapid and substantial sodium leaching, contributing to an increased degree of polymerization for the aluminosilicate tetrahedra in the gels. A plausible mechanism for this change is that Na leaches out from the interlayer and Ca ions progressively take over the role of charge compensators in the interlayer of the C-(N-)A-S-H structure.

硅铝酸钙钠水合物 C-(N-)ASH 凝胶是通过硅酸钙基材料的碱活化形成的，与通过混合材料水合形成的传统 C-(A-)SH 相相比，可能对水环境具有更大的敏感性。波特兰水泥。本研究研究了水浸泡引发的合成 C-(N-)ASH 凝胶的结构变化。研究了三种凝胶，每种凝胶的 Ca/Si（0.8 和 1.2）、Al/Si（0.1 和 0.3）以及 Na/Si（0.1、0.2 和 0.3）的化学计量比受控。具有较高Ca/Si比率的凝胶表现出增强的抗水浸出性并且仅经历边缘脱钙，而具有较低Ca/Si比率的凝胶表现出更显着的影响，包括Si的浸出损失。值得注意的是，所有凝胶都表现出快速且大量的钠浸出，有助于提高凝胶中硅铝酸盐四面体的聚合度。这种变化的一个可能机制是 Na 从夹层中滤出，Ca 离子逐渐接管 C-(N-)ASH 结构夹层中电荷补偿器的作用。