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Basic information on raw materials_
| Raw materials | Main chemical compositions | SO3 | Specific gravity | Surface area (g/cm2) | PSAI (%) at 28 days | |||
|---|---|---|---|---|---|---|---|---|
| CaO | SiO2 | Al2O3 | Fe2O3 | |||||
| CFA | 45.89 | 19.99 | 15.61 | 4.07 | 10.78 | 2.73 | 4,560 | 108 |
| FA | 4.80 | 48.60 | 34.31 | 6.46 | 0.71 | 2.21 | 10,800 | 86 |
| RUFA | 11.75 | 43.65 | 21.95 | 13.31 | 0.30 | 2.25 | 33,600 | 128 |
| slag | 44.68 | 24.85 | 20.47 | 0.67 | 1.79 | 2.88 | 5,840 | 115 |
Lists of test methods_
| Type | Experimental | Specification | Specimen size | Test age |
|---|---|---|---|---|
| Fresh properties | Setting time | ASTM C191 | — | — |
| Fluidity | ASTM C1437 | — | — | |
| Mini-slump | ASTM C143 | — | — | |
| Mechanical and thermal properties | Compressive strength (mold casting) | ASTM C109 | 5 cm × 5 cm × 5 cm | 7, 14, 28, 56 |
| Compressive strength (3D printing) | ASTM C109 | 5 cm × 5 cm × 5 cm | 7, 28 | |
| Thermal conductivity | — | ϕ10 cm × 5 cm | 28, 56 | |
| Gap inspection | Optical microscopy (OM) | — | 5 cm × 5 cm × 5 cm for printed specimens | 56 |
Mix proportions for first stage (unit: g)_
| Mix no. | w/b (l/b) | CFA | slag | RUFA | FA | water | NaOH | Na2SiO3 |
|---|---|---|---|---|---|---|---|---|
| C1 | 0.55 | 400 | 600 | — | — | 550 | — | — |
| C2 | 0.55 | 350 | 600 | 50 | — | 550 | — | — |
| C3 | 0.55 | 300 | 600 | 100 | — | 550 | — | — |
| C4 | 0.55 | 300 | 600 | — | 100 | 550 | — | — |
| A1 | 0.55 | 800 | 200 | — | — | 399.7 | 30.2 | 120.1 |
| A2 | 0.55 | 600 | 400 | — | — | 399.7 | 30.2 | 120.1 |
| A3 | 0.55 | 300 | 700 | — | — | 399.7 | 30.2 | 120.1 |
| A4 | 0.55 | 200 | 800 | — | — | 324.5 | 45.3 | 180.2 |
Mix proportions for second stage (unit: g)_
| Mix no. | w/b (l/b) | CFA | slag | RUFA | FA | water | NaOH | Na2SiO3 |
|---|---|---|---|---|---|---|---|---|
| C1* | 0.47 | 400 | 600 | — | — | 470 | — | — |
| C2* | 0.45 | 350 | 600 | 50 | — | 450 | — | — |
| C3* | 0.45 | 300 | 600 | 100 | — | 450 | — | — |
| C4* | 0.45 | 300 | 600 | — | 100 | 450 | — | — |
| A1* | 0.60 | 800 | 200 | — | — | 436.0 | 32.9 | 131.0 |
| A2* | 0.65 | 600 | 400 | — | — | 472.4 | 35.6 | 142.0 |
| A3* | 0.48 | 300 | 700 | — | — | 348.8 | 26.4 | 104.8 |
| A4* | 0.70 | 200 | 800 | — | — | 354.0 | 49.4 | 196.6 |