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🏗️ Concrete Strength Evaluation & Acceptance
GB/T 50107-2010: statistical (n≥10) / non-statistical (3–9) strength acceptance
Cube strength values f_cu,i (MPa, one per line or space-separated)
Evaluation logic (GB/T 50107-2010)
· Statistical method (n≥10): mfcu ≥ fcu,k + λ1·s and fmin ≥ λ2·fcu,k. λ1, λ2 per Table 5.1.3 (n 10–14: λ1=1.15, λ2=0.90; 15–19: 1.05, 0.85; ≥20: 0.95, 0.85).
· Non-statistical method (3≤n<10): mfcu ≥ 1.15·fcu,k and fmin ≥ 0.95·fcu,k.
· In the statistical method, when s < 0.06·fcu,k, use 0.06·fcu,k (minimum dispersion floor).
· If rejected, resample at a higher frequency per the code or investigate the cause.
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About Concrete Strength Evaluation
Evaluate concrete cube strength per GB/T 50107: statistical methods (known or unknown σ) and the non-statistical method, with acceptance decisions.
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