The soluble silicate species introduced by waterglass undergo both physical state and chemical structure evolution in WAS pastes at early age. After 15 min of reaction time, a portion of the silicate species remains in liquid form, but eventually most are exhausted and transformed into primary gels until the induction period. The volume and structure of these primary gels depend on the silicate concentration and configuration, respectively. Furthermore, although the contribution from rapidly available silicate species diminishes to nanostructures during the stable period, they still play a significant role in microstructure formation. Notably, substantial differences are observed in terms of gel chemistry and spatial distribution throughout the monitoring process. It is found that gels with nuclei rapidly formed on the slag surface exhibit relatively higher Ca/Si ratio compared to those with nuclei generated in solution. In addition, the presence of silicon-rich gels, which are formed within gaps between slag particles in highly silicious WAS samples, might be partially attributed to the abundance of cyclic and/or cage-like species available in waterglass.

中文翻译：

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早期水玻璃活性渣（WAS）糊中水玻璃中硅酸盐物种的演变

水玻璃引入的可溶性硅酸盐物质在早期的 WAS 浆料中经历了物理状态和化学结构的演变。反应时间 15 分钟后，一部分硅酸盐物质仍保持液体形式，但最终大部分被耗尽并转化为初级凝胶，直到诱导期。这些初级凝胶的体积和结构分别取决于硅酸盐浓度和构型。此外，尽管在稳定期间快速可用的硅酸盐物质对纳米结构的贡献减弱，但它们仍然在微观结构形成中发挥重要作用。值得注意的是，在整个监测过程中，在凝胶化学和空间分布方面观察到了显着差异。研究发现，与在溶液中生成核的凝胶相比，在渣表面快速形成核的凝胶表现出相对较高的Ca/Si比。此外，在高硅含量WAS样品中的炉渣颗粒之间的间隙内形成的富硅凝胶的存在可能部分归因于水玻璃中存在丰富的环状和/或笼状物质。