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. 2021 Dec 13;14(24):7691. doi: 10.3390/ma14247691

Figure 2.

Figure 2

Strength and porosity in concrete: (a) time-dependent evolution of compressive strength; (b) time-dependent evolution of porosity (the initial porosity, i.e., the porosity at 0 day was calculated based on the mix proportion); (c) correlation between compressive strength and porosity.