A luminescent sensor technique for pH analyses has been tested in cementitious media. The optical sensors monitor in-situ pH every 5 s during early hydration reactions over a period of 100 h from initial fluid up to consolidated stage. The pH development was analysed in calcium aluminate, calcium sulfoaluminate and OPC/slag cements up to a pH level of 13.3 and directly correlated with the heat of hydration. Thus tracing the dissolution and formation processes of solid phases via pH sensor monitoring is possible. This measurement technique enables the recording of continuous and highly reproducible pH data sets from slurries, pastes, and hardening materials leading to new vistas for individual (trans)formation pathways of solids, hydration and consolidation reactions in high alkaline cementitious systems.

用于 pH 分析的发光传感器技术已在水泥介质中进行了测试。在从初始流体到固结阶段的 100 小时内的早期水合反应期间，光学传感器每 5 秒监测一次原位 pH 值。分析了铝酸钙、硫铝酸钙和 OPC/矿渣水泥的 pH 值变化，pH 值最高为 13.3，并且与水化热直接相关。因此，通过 pH 传感器监测追踪固相的溶解和形成过程是可能的。这种测量技术能够记录来自浆体、糊状物和硬化材料的连续和高度可重复的 pH 数据集，从而为高碱性胶凝体系中固体、水化和固结反应的个体（转化）路径提供新的前景。