Steel diameter < 10 mm subgroup I (CI), 10 mm diameter > subgroup III (CIII) suitable for TCVN 1651 1, 2, TCVN 2008 and 2008. The durability of B35 concrete has, not shrink, stick steadily 16 + 2cm for TCVN 3105:1993, 10mm Dmax is less than or equal to the diameter of the material
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