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 ].
After tempering at 200–800 °C, the hardness of the 1Cr13 specimens showed a trend of first increasing, then significantly decreasing and finally rapidly increasing with the increase in the tempering temperature, while the hardness of 2Cr13 showed a consistent decreasing trend, after tempering at 200–770 °C, with the increase in the tempering temperature.