Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Concrete mix composition
| Concrete type | Quantities (kg/m3) | ||||
|---|---|---|---|---|---|
| Cement | Water | Silica fume | Coarse agg. | Fine agg. | |
| CEMI | 462 | 175 | 38 | 607 | 1014 |
| CEM II | 462 | 175 | 38 | 607 | 1014 |
| BABC | 462 | 175 | 38 | 607 | 1014 |
Chemical, physical and mechanical properties of cements
| Composition (%) | CEMI 42,5R | CEM II B-M (P-LL)32,5R | BAB |
|---|---|---|---|
| SiO2 | 20.79 | 19.15 | 21.56 |
| Fe2O3 | 2.23 | 2.2 | 2.76 |
| AI2O3 | 4.78 | 4.7 | 5.15 |
| CaO | 63.41 | 56.16 | 60.74 |
| MgO | 2.26 | 2.99 | 3.38 |
| SO3 | 2.65 | 1.94 | 2.25 |
| CI- | 0.0172 | 0.0187 | 0.0354 |
| Loss on Ignition | 2.36 | 11.38 | 2.43 |
| Na2O | 0.38 | 0.34 | 0.47 |
| Specific Surface (cm2/g) | 4089 | 4911 | 3646 |
| Specific Gravity (gr/cm3) | 3.11 | 2.96 | 3.08 |
| Comp. Strength (2 days) | 30.4 | 22 | 12.7 |
| (MPa) (28 days) | 59.8 | 45 | 35.8 |
Effect of different cement types on rheological properties
| Mix | Flow diameter | J-ring (mm) | L-box | V-funnel (s) | |
|---|---|---|---|---|---|
| D (mm) | t500 (s) | ||||
| CEMI | 700 | 2.5 | 20 | 0.8 | 9.6 |
| CEMII | 630 | 5.0 | 40 | 0.7 | 10.5 |
| BABC | 710 | 2.4 | 10 | 0.9 | 8.0 |
Experimental results
| Compressive strength (MPa) | |||||||
| Control | 100°C | 200°C | 300°C | 400°C | 600°C | 750°C | |
| BABC | 45.21 | 43.91 | 35.37 | 34.59 | 32.6 | 20.49 | 8.3 |
| CEMI | 39.40 | 35.10 | 34.36 | 29.21 | 27.81 | 14.75 | 5.3 |
| CEMII | 29.80 | 26.74 | 24.98 | 22.79 | 20.61 | 12.31 | 3.5 |
| Splitting tensile strength (MPa) | |||||||
| BABC | 5.13 | 5.07 | 4.11 | 4.00 | 3.75 | 2.37 | 0.95 |
| CEMI | 4.37 | 4.04 | 3.96 | 3.38 | 3.21 | 1.61 | 0.61 |
| CEMII | 3.40 | 3.11 | 2.88 | 2.63 | 2.37 | 1.43 | 0.40 |
| UPV (m/sn) | |||||||
| BABC | 4250 | 4201 | 3905 | 3756 | 2945 | 1750 | 1560 |
| CEMI | 4055 | 4049 | 3750 | 3456 | 2875 | 1659 | 1458 |
| CEMII | 3879 | 3854 | 3423 | 3105 | 2469 | 1480 | 1210 |
| Unit weight (kg/m3) | |||||||
| BABC | 2271 | 2269 | 2250 | 2201 | 2156 | 2140 | 2079 |
| CEMI | 2266 | 2255 | 2216 | 2198 | 2145 | 2120 | 2018 |
| CEMII | 2250 | 2247 | 2213 | 2174 | 2153 | 2059 | 2042 |