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. 2023 Nov 16;16(22):7195. doi: 10.3390/ma16227195
ρ Growth rate of the compressive strength in the current aging period;
f2 Compressive strength at the current age, MPa;
f1 Compressive strength at the previous age, MPa;
R Roundness (mean);
p Perimeter of the sample, cm;
a Pore area.