Table 6.
Physical and mechanical properties of concrete compositions.
| Composition No. |
Design Grade | Compressive Strength (MPa) (Rb) |
Flexural Strength (MPa) (Rbt) |
Frost Resistance, Cycles (F) |
Volumetric Water Absorption (%) |
Average Density (kg/m3) | ||
|---|---|---|---|---|---|---|---|---|
| After Heating | 28 Days | After Heating | 28 Days | |||||
| 1 | B 25 | 24.9 | 32.4 | 3.1 | 3.3 | 150 | 7.1 | 2396 |
| B 30 | 29.7 | 38.7 | 3.7 | 3.9 | 150 | 6.8 | 2402 | |
| B 35 | 31.4 | 45.3 | 4.0 | 4.3 | 200 | 6.5 | 2425 | |
| B 40 | 37.2 | 52.7 | 4.4 | 5.0 | 200 | 6.0 | 2437 | |
| 2 | B 25 | 25.2 | 32.6 | 3.0 | 3.3 | 250 | 6.2 | 2434 |
| B 30 | 30.1 | 38.9 | 3.7 | 3.8 | 250 | 5.7 | 2445 | |
| B 35 | 35.1 | 45.5 | 3.9 | 4.4 | 300 | 5.0 | 2460 | |
| B 40 | 42.0 | 53.1 | 4.1 | 4.9 | 300 | 4.7 | 2475 | |
| 3 | B 25 | 26.0 | 32.5 | 3.1 | 3.4 | 300 | 5.1 | 2451 |
| B 30 | 29.3 | 39.0 | 3.6 | 4.0 | 300 | 4.4 | 2460 | |
| B 35 | 39.3 | 45.1 | 4.1 | 4.6 | 300 | 4.0 | 2496 | |
| B 40 | 47.2 | 53.5 | 4.4 | 5.3 | 300 | 3.6 | 2504 | |
| 4 | B 25 | 24.6 | 33.0 | 4.7 | 6.3 | 300 | 5.8 | 2385 |
| B 30 | 29.5 | 39.7 | 5.0 | 6.7 | 300 | 5.3 | 2397 | |
| B 35 | 36.2 | 50.1 | 5.1 | 6.9 | 300 | 4.8 | 2405 | |
| B 40 | 44.1 | 52.5 | 5.4 | 7.1 | 300 | 4.2 | 2451 | |