Technical regulations for concrete reinforcement steel in Vietnam
Based on Section 2.1 Section 2 of the Vietnam National Technical Regulation QCVN 07:2019/BKHCN issued together with Circular 13/2019/TT-BKHCN stipulating technical regulations for concrete reinforcement steel as follows:
- Dimensions, weight per meter length, and permissible deviations according to Table 1.
- Grades, chemical composition, and mechanical properties of smooth round bars according to the provisions of TCVN 1651-1:2018, Concrete Reinforcement Steel - Part 1: Smooth Round Bars.
- Requirements for ribs, grades, chemical composition, and mechanical properties of deformed bars according to the provisions of TCVN 1651-2:2018, Concrete Reinforcement Steel - Part 2: Deformed Bars.
- Shape, dimensions, chemical composition, and mechanical properties of welded steel mesh according to the provisions of TCVN 1651-3:2008 (ISO 6935-3:2007), Concrete Reinforcement Steel - Part 3: Welded Steel Mesh.
- Dimensions, weight, tolerances, geometric shapes of deformed wires, indented wires, chemical composition, mechanical properties of cold-drawn steel wires for concrete reinforcement and production of welded steel mesh for concrete reinforcement according to the provisions of TCVN 6288:1997 (ISO 10544:1992), Cold-Drawn Steel Wires for Concrete Reinforcement and Production of Welded Steel Mesh.
Table 1 - Dimensions, weight per meter length, and permissible deviations
| Nominal Diameter d mm |
Nominal Cross-Sectional Area ^a^ S0 mm^2^ |
Weight per meter length | |
| Requirement ^b^ kg/m |
Permissible Deviation ^c^ % |
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| 6 | 28.3 | 0.222 | ± 8 |
| 8 | 50.3 | 0.395 | ± 8 |
| 10 | 78.5 | 0.617 | ± 6 |
| 12 | 113 | 0.888 | ± 6 |
| 14 | 154 | 1.21 | ± 5 |
| 16 | 201 | 1.58 | ± 5 |
| 18 | 255 | 2.00 | ± 5 |
| 20 | 314 | 2.47 | ± 5 |
| 22 | 380 | 2.98 | ± 5 |
| 25 | 491 | 3.85 | ± 4 |
| 28 | 616 | 4.83 | ± 4 |
| 32 | 804 | 6.31 | ± 4 |
| 36 | 1018 | 7.99 | ± 4 |
| 40 | 1257 | 9.86 | ± 4 |
| 50 | 1964 | 15.42 | ± 4 |
| ^a^ S0 = 0.7854 x d^2^. ^b^ Weight per length = 7.85 x 10^-^^3^ x S0. ^c^ Permissible deviation for a single bar. 1) Diameter d50 is only applicable for deformed bars. 2) According to the agreement between the manufacturer and the buyer, it is possible to use smooth round bars and deformed bars with nominal diameters different from those stated in Table 1 but must have the chemical composition and mechanical properties specified in this technical regulation, with the permissible deviation for the weight per meter length as follows: - For d ≤ 8, the permissible deviation is ± 8 %. - For 8 < d ≤ 12, the permissible deviation is ± 6 %. - For 12 < d ≤ 22, the permissible deviation is ± 5 %. - For d > 22, the permissible deviation is ± 4 %. |
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