The pozzolanic reaction degree of supplementary cementitious materials (SCMs) is a crucial parameter influencing the performance of SCM-blended concrete. Although several methods, such as partial-or-no-known-crystal-structure (PONKCS) analysis with X-ray diffraction (XRD) testing and image analysis, have been developed to estimate the pozzolanic reaction degree of SCMs, they have their own challenges in achieving reliable estimation. Ethylenediaminetetraacetic acid (EDTA) with NaOH is an efficient and reliable agent for selectively dissolving calcium-rich phases (e.g., cement clinkers and hydration products) without dissolving low-calcium SCMs. In this study, the ionic selective dissolution method (ISDM) that combines the use of an EDTA–NaOH dissolving agent and inductively coupled plasma–optical emission spectroscopy is developed to efficiently and reliably determine the pozzolanic reaction degree of low-calcium SCMs. Furthermore, the chemical compositions of aluminium-incorporated calcium–silicate–hydrate gel are determined via the ISDM coupled with the Rietveld analysis of XRD data, according to mass conservation principles.

中文翻译：

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测定混合水泥浆体中低钙辅助胶凝材料火山灰反应程度的有效方法


辅助胶凝材料（SCM）的火山灰反应程度是影响SCM掺混混凝土性能的关键参数。尽管已经开发了几种方法来估计 SCM 的火山灰反应程度，例如部分或无已知晶体结构 (PONKCS) 分析结合 X 射线衍射 (XRD) 测试和图像分析，但它们都有自己的特点实现可靠估计的挑战。乙二胺四乙酸 (EDTA) 与 NaOH 是一种高效可靠的试剂，用于选择性溶解富钙相（例如水泥熟料和水化产物），而不溶解低钙 SCM。在本研究中，开发了结合使用 EDTA-NaOH 溶解剂和电感耦合等离子体光发射光谱的离子选择性溶解方法 (ISDM)，以有效、可靠地测定低钙 SCM 的火山灰反应程度。此外，根据质量守恒原理，通过 ISDM 结合 XRD 数据的 Rietveld 分析，确定了掺铝硅酸钙水合物凝胶的化学成分。