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Error curves using linear with and without intercept and power function: (a) 50-mm cubes to 100-mm cubes; (b) 50-mm cubes to 75 × 150 mm cylinders; (c) 100-mm cubes to 75 × 150 mm cylinders (fexp=experimental strength, fpred=predicted strength, f75 = 75 × 150 mm cylinder strength, f100 = 100 × 100 mm cube strength, f50 = 50 × 50 mm cube strength).
