Print Email Facebook Twitter Some Critical Reflections on the SEM-EDS Microanalysis of the Hydrotalcite-like Phase in Slag Cement Paste Title Some Critical Reflections on the SEM-EDS Microanalysis of the Hydrotalcite-like Phase in Slag Cement Paste Author Zhang, Y. (TU Delft Materials and Environment) Saravanakumar, Karthikeyan (Student TU Delft) Copuroglu, Oguzhan (TU Delft Materials and Environment) Date 2023 Abstract For a better understanding of the hydrotalcite-like phase with SEM-EDS microanalysis, the present research paid special attention to the data acquisition and interpretation of this technique. A lower Mg/Al ratio was obtained when using a higher accelerating voltage, and a beam energy of 10 kV was more appropriate than 15 kV for investigation when the slag rim was thin, to compromise to meet the requirements of obtaining an adequate overvoltage ratio and minimizing the interference. Additionally, it was noted that the Mg/Al ratio decreased from zones rich in hydrotalcite-like phase to zones rich in the C−S−H gel phase, and indiscriminately fitting scatter points selected from the slag rim would bias the Mg/Al ratio of the hydrotalcite-like phase. According to the standard-based microanalysis, it was concluded that the analysis total of the hydrates within the slag rim was in the range of 30–40%, lower than that located in the cement matrix. Besides the water chemically bound in the C−S−H gel phase, the hydrotalcite-like phase also contained a certain amount of hydroxide ions and chemically bound water. Subject hydrotalcite-like phaseaccelerating voltagestandard-based and standardlessmicroanalysiscompositional zonation To reference this document use: http://resolver.tudelft.nl/uuid:876baca5-3797-40c0-a3ba-94a9146c4cfd DOI https://doi.org/10.3390/ma16083143 ISSN 1996-1944 Source Materials, 16 (8) Part of collection Institutional Repository Document type journal article Rights © 2023 Y. Zhang, Karthikeyan Saravanakumar, Oguzhan Copuroglu Files PDF materials_16_03143_v2.pdf 3.54 MB Close viewer /islandora/object/uuid:876baca5-3797-40c0-a3ba-94a9146c4cfd/datastream/OBJ/view