The effect of the supplementary materials (SCMs) on the moisture content and ion diffusivity at different hydration time is important for the service life modelling of modern concrete. This study designed a simple but valid method to monitor the microstructure change in pastes during hydration. A procedure easy to implement was proposed to detect the water content in pastes. The electrical conductivity of pore solution was evaluated by the evaporable water content in pastes and chemical composition in the binders. Results show that the electrical properties of pastes (conductivity, formation factor and its growth rate) can effectively indicate the hydration reactivity of binder, pore connectivity and volume of pore solution in the hardened pastes. The effect of water-binder ratio and SCMs on the structure of pastes are effectively indexed by the formation factor which is the conductivity of pore solution divided by that of paste. The inflection point of average growth rate of formation factor is a good index for the final setting of pastes. The relation between volume of evaporable water and formation factor is well demonstrated by the extended percolation theory. The real-time monitored electrical conductivity and formation factor of pastes can be used to calculate the chloride migration coefficient in hardened cement pastes.

补充材料（SCMs）在不同水化时间下对水分含量和离子扩散率的影响对于现代混凝土的使用寿命建模具有重要意义。本研究设计了一种简单但有效的方法来监测水化过程中浆料的微观结构变化。提出了一种易于实施的程序来检测糊状物中的水含量。孔隙溶液的电导率通​​过浆料中的可蒸发水含量和粘合剂中的化学成分来评价。结果表明，浆料的电性能（电导率、形成因子及其生长速率）可以有效地指示硬化浆料中粘合剂的水合反应性、孔隙连通性和孔隙溶液的体积。水胶比和SCMs对浆料结构的影响可以通过孔隙溶液的电导率除以浆料的电导率来有效地反映。形成因子平均增长率的拐点是浆料最终凝固的一个很好的指标。扩展渗流理论很好地证明了可蒸发水量与形成因子之间的关系。实时监测的浆体电导率和形成因子可用于计算硬化水泥浆体中的氯化物迁移系数。扩展渗流理论很好地证明了可蒸发水量与形成因子之间的关系。实时监测的浆体电导率和形成因子可用于计算硬化水泥浆体中的氯化物迁移系数。扩展渗流理论很好地证明了可蒸发水量与形成因子之间的关系。实时监测的浆体电导率和形成因子可用于计算硬化水泥浆体中的氯化物迁移系数。