Table 4 Unconfined compressive strength results of CSM under different mixing conditions.
Cement dosage (%) | Mixing code | Curing ages (days) | Unconfined compressive strength | Percentage strength increase compared with CM0 | ||
|---|---|---|---|---|---|---|
Average compressive strength (MPa) | Standard deviation (MPa) | Coefficient of variation Cv (%) | ||||
2.0 | CM0 | 7 | 1.59 | 0.269 | 16.9 | 0.0 |
VM1.0 | 7 | 2.49 | 0.258 | 10.4 | 56.6 | |
VM2.0 | 7 | 2.73 | 0.261 | 9.6 | 71.7 | |
VM3.5 | 7 | 2.87 | 0.222 | 7.7 | 80.5 | |
3.0 | CM0 | 7 | 2.36 | 0.366 | 15.5 | 0.0 |
VM1.0 | 7 | 3.60 | 0.274 | 7.6 | 52.5 | |
VM2.0 | 7 | 4.07 | 0.390 | 9.6 | 72.5 | |
VM3.5 | 7 | 4.26 | 0.307 | 7.2 | 80.5 | |
4.0 | CM0 | 7 | 3.48 | 0.575 | 16.5 | 0.0 |
VM1.0 | 7 | 4.74 | 0.460 | 9.7 | 36.2 | |
VM2.0 | 7 | 5.46 | 0.460 | 8.4 | 56.9 | |
VM3.5 | 7 | 5.77 | 0.380 | 6.6 | 65.8 | |
5.0 | CM0 | 3 | 4.15 | 0.648 | 15.6 | 0.0 |
VM1.0 | 3 | 4.93 | 0.506 | 10.3 | 18.8 | |
VM2.0 | 3 | 5.19 | 0.514 | 9.9 | 25.1 | |
VM3.5 | 3 | 5.49 | 0.542 | 9.9 | 32.3 | |
CM0 | 7 | 4.39 | 0.631 | 14.4 | 0.0 | |
VM1.0 | 7 | 5.27 | 0.502 | 9.5 | 20.0 | |
VM2.0 | 7 | 5.83 | 0.563 | 9.7 | 32.8 | |
VM3.5 | 7 | 6.18 | 0.493 | 8.0 | 40.8 | |
CM0 | 14 | 5.38 | 0.869 | 16.2 | 0.0 | |
VM1.0 | 14 | 6.27 | 0.662 | 10.6 | 16.5 | |
VM2.0 | 14 | 6.99 | 0.732 | 10.5 | 29.9 | |
VM3.5 | 14 | 7.27 | 0.536 | 7.4 | 35.1 | |