Scanning electron micoroscope (SEM) micrographs with of 3D printed concrete specimens containing bismuth-oxide and gadolinium-oxide particles

Raw Scanning electron micoroscope (SEM) Images for publication Sikora P., Skibicki S., Chougan M., Szewczyk P., Cendrowski K., Federowicz K., El-Khayatt A.M., Saudi H.A., Strzałkowski J., Abd Elrahman M., Techman M., Sibera D., Chung S.Y. Silica-coated admixtures of bismuth and gadolinium oxides for 3D printed concrete applications: Rheology, hydration, strength, microstructure, and radiation shielding perspective. Construction and Building Materials (2025) 470, 140563, https://doi.org/10.1016/j.conbuildmat.2025.140563 
Names of files corresponding to sample designation in the publication.
A Hitachi TM3000 SEM instrument with Bruker Quantax EDS was used to assess the uniformity of the distribution and the possible occurrence of coagulation of silica-coated bismuth and gadolinium oxides. Specimens with an area of approx. 2 cm2 and a thickness of up to 3 mm were prepared for the tests from the middle sections of cubic specimens. The samples were sputtered with gold-palladium alloy in a vacuum chamber to increase the electrical conductivity of the tested surface. Photos were taken in a magnification range from 50 × to 1000 × . Energy-dispersive X-ray spectroscopy was used to assess the elemental composition and the distribution of the bismuth element in the specimen. Before the EDS tests, the device was calibrated on a reference copper specimen.
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