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Chemical composition of the steel slag micro powder and FA
| Chemical composition | SiO2 | Al2O3 | CaO | Fe2O3 | K2O | MgO | P2O5 | Na2O | |
|---|---|---|---|---|---|---|---|---|---|
| Content (%) | Steel slag micro powder | 21.04 | 4.61 | 30.82 | 24.39 | 0.11 | 2.47 | 0.63 | 1.85 |
| FA | 53.24 | 31.37 | 4.26 | 3.95 | - | 1.49 | - | - | |
Design experimental for FGSG
| Number | Volume fraction [v%] | Fiber length [mm] |
|---|---|---|
| B0L0 | 0 | 0 |
| B1L1 | 0.05 | 9 |
| B1L2 | 0.05 | 12 |
| B1L3 | 0.05 | 15 |
| B1L4 | 0.05 | 18 |
| B2L1 | 0.1 | 9 |
| B2L2 | 0.1 | 12 |
| B2L3 | 0.1 | 15 |
| B2L4 | 0.1 | 18 |
| B3L1 | 0.15 | 9 |
| B3L2 | 0.15 | 12 |
| B3L3 | 0.15 | 15 |
| B3L4 | 0.15 | 18 |
| B4L1 | 0.2 | 9 |
| B4L2 | 0.2 | 12 |
| B4L3 | 0.2 | 15 |
| B4L4 | 0.2 | 18 |
Orthogonal experiment table of geopolymer
| Number | Slag-to-powder ratio | Alkali content [%] | Water glass modulus |
|---|---|---|---|
| A1 | 2:8 | 6 | 1.2 |
| A2 | 2:8 | 8 | 1.6 |
| A3 | 2:8 | 10 | 1.4 |
| A4 | 3:7 | 6 | 1.6 |
| A5 | 3:7 | 8 | 1.4 |
| A6 | 3:7 | 10 | 1.2 |
| A7 | 4:6 | 6 | 1.4 |
| A8 | 4:6 | 8 | 1.2 |
| A9 | 4:6 | 10 | 1.6 |
Compressive strength range analysis table
| 7d compressive strength | 28d compressive strength | |||||
|---|---|---|---|---|---|---|
| Slag-to-powder ratio | Alkali content | Water glass modulus | Slag-to-powder ratio | Alkali content | Water glass modulus | |
| k1 | 1.73 | 1.67 | 1.67 | 6.98 | 6.68 | 6.68 |
| k2 | 1.92 | 2.06 | 2.01 | 7.51 | 8.17 | 7.90 |
| k3 | 1.51 | 1.43 | 1.48 | 6.08 | 5.72 | 5.98 |
| R | 0.41 | 0.63 | 0.53 | 1.43 | 2.45 | 1.92 |
Physical properties of FA
| Fineness (45μm) [%] | Water demand [%] | Loss on ignition [%] | Moisture content [%] | Specific surface area [cm2.g−1] |
|---|---|---|---|---|
| 18.9 | 87 | 2.5 | 0.03 | 3025 |
Technical indicators of aeolian sand
| Bulk density [g·cm−3] | Apparent density [g·cm−3] | Natural moisture content [%] | Mud content [%] | Weight density [KN·m−3] |
|---|---|---|---|---|
| 1.629 | 2.842 | 1.58 | 1.52 | 16.6 |
Compressive strength variance analysis table
| 7d compressive strength | 28d compressive strength | |||||
|---|---|---|---|---|---|---|
| Slag-to-powder ratio | Alkali content | Water glass modulus | Slag-to-powder ratio | Alkali content | Water glass modulus | |
| SS | 0.252 | 0.609 | 0.435 | 3.154 | 9.125 | 5.665 |
| DF | 2 | 2 | 2 | 2 | 2 | 2 |
| MS | 0.126 | 0.304 | 0.217 | 1.577 | 4.563 | 2.832 |
| F | 33.099 | 79.857 | 57.029 | 15.100 | 43.688 | 27.122 |
| P | 0.029 | 0.012 | 0.017 | 0.062 | 0.022 | 0.036 |
Effect of different number of freeze-thaw cycles on BDR
| Group | RC / MPa | Cycles | RDC / MPa | BDR / [%] | Cycles | RDC / MPa | BDR / % |
|---|---|---|---|---|---|---|---|
| B3L0 | 4.96 | 3 | 4.70 | 94.76 | 9 | 4.26 | 85.89 |
| B3L1 | 5.20 | 3 | 4.98 | 95.77 | 9 | 4.51 | 86.73 |
| B3L2 | 5.37 | 3 | 5.21 | 97.02 | 9 | 4.80 | 89.39 |
| B3L3 | 5.31 | 3 | 5.15 | 96.99 | 9 | 4.71 | 88.70 |
| B3L4 | 5.25 | 3 | 5.07 | 96.57 | 9 | 4.63 | 88.19 |
| B3L0 | 4.96 | 6 | 4.49 | 90.52 | 12 | 4.00 | 80.64 |
| B3L1 | 5.20 | 6 | 4.78 | 91.92 | 12 | 4.22 | 81.15 |
| B3L2 | 5.37 | 6 | 5.03 | 93.67 | 12 | 4.45 | 82.87 |
| B3L3 | 5.31 | 6 | 4.95 | 93.22 | 12 | 4.37 | 82.29 |
| B3L4 | 5.25 | 6 | 4.87 | 92.76 | 12 | 4.30 | 81.90 |