Barely Significant

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The silica content is highly significant in pozzolans used as an additive or partial replacement for cement in concrete, as the silica present in these ashes can react with the calcium hydroxide released during cement hydration, forming calcium silicate hydrates (C-S-H) [ 7 ], which are responsible for the mechanical properties of cement [ 1 , 8 ].
An examination of Figure 10 and Figure 11 reveals a clear trend: with the increase in the annealing temperature, the proportion of low- and medium-angle grain boundaries in the alloy gradually decreases, while the proportion of high-angle grain boundaries (HAGBs, misorientation angles > 15°) increases.
As shown in Figure 6 , the lower d (0.02–0.04 mm), the greater the measurement accuracy and the lower the fatigue life; h (0.3–0.6 mm), l A (6–11 mm), and the optimal value between the measurement accuracy and the fatigue life; N S (1–11) and the measurement accuracy of the optimal value; the fatigue life with the increase in N S is a decreasing trend [ 41 ].
During the frost durability test, when the substitution rate of RCA was kept constant, the loss rate of the flexural strength of PAN-RC showed a trend of decrease followed by the increase in PANF, in which the loss rate of flexural strength of concrete with PANF mixing content of 0.8 kg/m 3 was the smallest, and its frost durability was the best. 4.