Time-series surface resistivity (SR) measurements are evaluated as an indicator of pozzolanicity in concretes containing 13 materials of both known and unknown pozzolanicity, under standard and accelerated curing conditions, and the results were validated against portlandite consumption obtained through thermogravimetric analysis. Change-point detection (CPD) analysis is applied to the data to provide a rigorous indicator of hydration age of the onset and rate of the pozzolanic reaction, if occurring. The SR measurements were able to capture the onset of the pozzolanic reactions in concretes curing at elevated temperature regimes, which allows determination of pozzolanicity weeks earlier than at standard curing temperatures. Using CPD along with slope analysis allows a comprehensive analysis of a material's reactivity and determination of pozzolanicity in as quickly as two days. Time-series SR measurements at elevated curing conditions, along with limits on material composition, are recommended for determination of pozzolanic reactivity in novel or variable materials.

在标准和加速固化条件下，时间序列表面电阻率 (SR) 测量值被评估为包含 13 种已知和未知火山灰性材料的混凝土的火山灰性指标，并且结果针对通过热重分析获得的硅酸盐消耗进行了验证。对数据应用变化点检测 (CPD) 分析，以提供严密的指示水化反应开始的时间和火山灰反应的速率（如果发生）。SR 测量能够捕获在高温状态下固化的混凝土中火山灰反应的开始，这允许比在标准固化温度下提前几周确定火山灰度。使用 CPD 和斜率分析可以对材料进行全面分析 在短短两天内即可完成反应性和火山灰性测定。建议在升高的固化条件下进行时间序列 SR 测量以及材料成分的限制，以测定新型或可变材料中的火山灰反应性。