Abstract Ground granulated blast furnace slag (GGBS) is a glassy by-product of pig iron production and is commonly used in concrete industry to replace cement and thereby lower the carbon footprint of the material. Large variations in reactivity exist depending on the GGBS physical and chemical features. Here we investigate the ability of three rapid calorimetric methods to evaluate the reactivity of GGBS. On a set of 16 industrial GGBS, we show that 24 h heat release, using the R3-protocol, correlates well with 2d compressive strength of standard mortars using 75 wt% GGBS. The correlation of R3-test results (R2 = 0.87) is better than for traditional reactivity indices calculated from chemical composition. Furthermore, we present data on the repeatability of the test protocol and show that the R3-protocol is very sensitive to sample fineness. Finally, XRD patterns show that slight differences in phase assemblage exist between the most and least reactive GGBS.

中文翻译：

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R3 测试评估 16 种工业磨粒高炉矿渣 (GGBS) 早期反应性差异的能力

摘要 磨碎的高炉矿渣（GGBS）是生铁生产的玻璃状副产品，常用于混凝土行业以替代水泥，从而降低材料的碳足迹。根据 GGBS 物理和化学特征，反应性存在很大差异。在这里，我们研究了三种快速量热法评估 GGBS 反应性的能力。在一组 16 个工业 GGBS 上，我们表明使用 R3 协议的 24 小时放热与使用 75 wt% GGBS 的标准砂浆的 2d 抗压强度密切相关。R3 测试结果的相关性 (R2 = 0.87) 优于根据化学成分计算的传统反应性指数。此外，我们提供了有关测试协议可重复性的数据，并表明 R3 协议对样品细度非常敏感。