Influence of Fly Ash Content on the Durability of Mortar Specimens under Dry/Wet Sulfate Attack.

Flexural Strength As shown in Figure 3 a, under the standard-curing condition of 20 °C, with the extension of the erosion cycles, the flexural strength of all specimens showed an increasing trend first, and then decreased.

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Compressive Strength Figure 4 a demonstrates that, under the standard-curing conditions, throughout the observed erosion cycles, the compressive strength of the mortar specimens exhibited an overall trend of increasing at first and then decreasing with the rise in the number of erosion cycles.

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