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Polymorph and minor phase quantification in Portland clinker by X-ray powder diffraction analysis: Addressing challenges and foreign ion effects
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2025-01-29 , DOI: 10.1016/j.cemconres.2025.107801
Paulo R. de Matos, José S. Andrade Neto, Carlos E.M. Campos, Ruben Snellings, Robert E. Dinnebier, Ana P. Kirchheim

A comprehensive investigation of the phase composition of eight commercial clinkers was conducted through state-of-the-art synchrotron (SXRD) and laboratory (LXRD) X-ray diffraction, and supporting techniques. Challenges involved in polymorph and minor phase quantification, and the effects of foreign ions on the clinker chemistry were addressed. SXRD yielded higher C3S and lower C2S contents than LXRD, besides higher C3S M3. Visual identification of C3S predominant polymorphs did not always match the Rietveld results for LXRD. Using orthorhombic-C3A in the refinement of samples that did not have this polymorph led to an underestimation of C4AF and α′H-C2S. Axial divergence made the quantification of β-C2S inaccurate for non-monochromatic LXRD. C3S formation was governed by the sulfate/magnesium ratio and Na2Oeq content rather than LSF, while C3S polymorphism was governed by the sulfate/magnesium + alkali ratio. Optimal chemistry ranges were proposed for maximizing C3S formation. C3A polymorphism was generally controlled by the sulfate/alkali ratio.

中文翻译:


通过 X 射线粉末衍射分析对波特兰熟料进行多晶型和微量相定量:应对挑战和外来离子效应



通过最先进的同步加速器 (SXRD) 和实验室 (LXRD) X 射线衍射和支持技术,对八种商业熟料的物组成进行了全面调查。解决了多晶型和微量相定量所涉及的挑战,以及外来离子对熟料化学的影响。除了更高的 C3S M3 外,SXRD 产生的 C3S 高于 LXRD,C2S 含量较低。C3S 主要多晶型物的视觉识别并不总是与 LXRD 的 Rietveld 结果相匹配。在精炼没有这种多晶型物的样品中使用正方晶型 C3A 导致 C4AF 和 α′H-C2S 的低估。轴向发散使得非单色 LXRD 的 β-C2S 定量不准确。C3S 的形成受硫酸盐/镁比和 Na2Oeq 含量的控制,而不是 LSF,而 C3S 多态性受硫酸盐/镁 + 碱比的控制。提出了最大化 C3S 形成的最佳化学范围。C3A 多态性通常受硫酸盐/碱比控制。
更新日期:2025-01-29
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