Research Article
Structural Safety Assessment of Existing Multiarch Tunnel: A Case Study
Table 4
Concrete strength grade.
| | Type | C15 | C20 | C25 | C30 | C35 |
| | Axial compressive strength | 7.5 | 10 | 12.5 | 15 | 16.1 | | Flexural compressive strength | 8.5 | 11 | 13.5 | 16.5 | 17.7 | | Axial tensile strength | 0.93 | 1.13 | 1.33 | 1.47 | 1.52 |
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