The incorporation of locally available supplementary cementitious materials (SCMs) in cement blends is essential for reducing the environmental impact of construction. However, assessing the pozzolanic kinetics, and thus the pozzolanic contribution at a given age, is challenging due to temperature differences between the two main evaluation methods: ASTM C1897 (40 °C, continuous heat release) and ASTM C311 (20 °C, Strength Activity Index at 28 days). This study examines 22 SCMs, analysing their composition, mineralogy, texture, and pozzolanic behaviour. ASTM C1897 was applied as prescribed, while ASTM C311 was modified by maintaining a constant water-to-binder ratio and introducing an additional 68% PC–20% SCM–10% limestone–2% gypsum series to better isolate pozzolan effects. The results confirmed established pozzolanic trends, with kaolinite-rich calcined clays ≳ silica fume > smectite-rich calcined clays > natural pozzolans ≳ class-F fly ashes. The modified series yielded clearer correlations, particularly between SAI^20ºC_28d and Heat^40ºC_3d, forming two well-defined clusters that reflect general behaviour. These findings suggest that the modified series could serve as a more reliable framework for future SAI evaluations. Moreover, for the 80% PC–20% SCM, the best correlation is found for the R³-heat release at 12 h (at 40ºC) and the SAI values at 28 days (at 20ºC). Additional insights into the pozzolanic kinetics and performance of the materials are also presented, contributing to a deeper understanding of their potential in sustainable construction practices.

中文翻译：

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R3 测试结果与五类补充胶凝材料抗压强度之间的一般相关性

在水泥混合物中加入当地可用的补充胶凝材料 （SCM） 对于减少施工对环境的影响至关重要。然而，由于两种主要评估方法之间的温度差异，评估火山灰动力学以及火山灰在给定年龄的贡献是具有挑战性的：ASTM C1897（40 °C，连续放热）和 ASTM C311（20 °C，28 天时的强度活性指数）。本研究研究了 22 种 SCM，分析了它们的成分、矿物学、质地和火山灰行为。ASTM C1897 按规定应用，而 ASTM C311 通过保持恒定的水与粘合剂比例并引入额外的 68% PC-20% SCM-10% 石灰石-2% 石膏系列进行修改，以更好地隔离火山灰效应。结果证实了既定的火山灰趋势，富含高岭石的煅烧粘土 ≳ 硅灰 > 富含蒙脱石的煅烧粘土 > 天然火山灰 ≳ F 类粉煤灰。修改后的序列产生了更清晰的相关性，特别是在 SAI^20ºC_28d 和 Heat^40ºC_3d 之间，形成了两个反映一般行为的明确定义的集群。这些发现表明，修改后的系列可以作为未来 SAI 评估的更可靠框架。此外，对于 80% PC-20% SCM，12 小时 （40ºC） 时的 R³ 热释放和 28 天 （20ºC） 时的 SAI 值具有最佳相关性。此外，还介绍了对材料火山灰动力学和性能的更多见解，有助于更深入地了解它们在可持续建筑实践中的潜力。