Print Email Facebook Twitter EDS Microanalysis of Unhydrated Blast Furnace Slag Grains in Field Concrete with Different Service Life Title EDS Microanalysis of Unhydrated Blast Furnace Slag Grains in Field Concrete with Different Service Life Author Zhang, Y. (TU Delft Materials and Environment) Saravanakumar, Karthikeyan (Student TU Delft) Copuroglu, Oguzhan (TU Delft Materials and Environment) Date 2022 Abstract Because the essential quality metrics of blast furnace slag are based on its oxide composition, the determination of chemical compositions of unhydrated slag grains in an aged concrete could be useful for understanding its past performance and in predicting the remaining service life of existing slag-bearing concrete. In this research, the authors explored the feasibility of using standard-based energy-dispersive X-ray spectroscopy (EDS) microanalysis, in tandem with electron imaging, as a tool for quantitative measurement of the chemical composition of blast furnace slag grains in cement/concrete. In the experimental study, seven concrete samples representing various service life durations were collected in the Netherlands. The microanalysis results of the samples revealed that the change in slag chemistry is insignificant for samples B (1985) to F (2006); however, elevated CaO and SiO2 contents are found in slag used for sample G (2015), opposite to that of Al2O3 and MgO. After discussing compositional characterization, the paper discusses favorable microanalysis protocols for acceptable elemental quantification accuracy. It was concluded that quantitative EDS microanalysis is a strong tool to characterize the chemical composition of unhydrated slag used in field concrete, which could potentially contribute to understanding the correlations between composition and long-term performance in slag concrete structures. Subject blast furnace slagBSEEDSmicroanalysisservice life To reference this document use: http://resolver.tudelft.nl/uuid:da790c2c-4a9f-4f8e-a413-bb2cbd9d0e82 DOI https://doi.org/10.1017/S1431927622000848 ISSN 1431-9276 Source Microscopy and Microanalysis, 28 (5), 1493-1503 Part of collection Institutional Repository Document type journal article Rights © 2022 Y. Zhang, Karthikeyan Saravanakumar, Oguzhan Copuroglu Files PDF eds_microanalysis_of_unhy ... e_life.pdf 746.99 KB Close viewer /islandora/object/uuid:da790c2c-4a9f-4f8e-a413-bb2cbd9d0e82/datastream/OBJ/view