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Compressive strength vs. age for different ultrafine dosages with different w/c ratios: (a) compressive strength vs. age for different ultrafine dosages at w/c 0.25; (b) compressive strength vs. age for different ultrafine dosages at w/c 0.30; (c) compressive strength vs. age for different ultrafine dosages at w/c 0.35; (d) compressive strength vs. age for different ultrafine dosages at w/c 0.40.
