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. 2021 Oct 28;14(21):6487. doi: 10.3390/ma14216487

Figure 1.

Figure 1

Figure 1

The scanning microscope images of (a) blank concrete sample, (b) concrete sample with bulk 5% of bismuth oxide sample, (c) concrete sample with 5% of nano-bismuth oxide sample, and (d) concrete sample with 10% of nano-bismuth oxide sample.