Research Article
Waste Foundry Sand Usage for Building Material Production: A First Geopolymer Record in Material Reuse
Table 4
The results of the WFS-based geopolymer materials produced by using Na2SiO3.
| Curing temperature (°C) | Na2SiO3 amount (with respect to WFS, w/w) (%) | UW (g/cm3) | CS (MPa) | WAP (%) | Porosity (%) | 7 days | 28 days |
| 75 | 38 bome | 10 | 1.69 | — | — | BIW | BIW | 20 | 1.60 | — | — | BIW | BIW | 30 | 1.65 | — | — | BIW | BIW | 48 bome | 10 | 1.68 | — | — | BIW | BIW | 20 | 1.80 | — | — | BIW | BIW | 30 | 1.73 | — | — | BIW | BIW |
| 100 | 38 bome | 10 | 1.65 | 0.7 | — | BIW | BIW | 20 | 1.69 | 2.7 | — | BIW | BIW | 30 | 1.57 | 0.9 | — | BIW | BIW | 48 bome | 10 | 1.67 | 0.9 | 1.3 | BIW | BIW | 20 | 1.72 | 0.9 | — | BIW | BIW | 30 | 1.55 | 0.9 | — | BIW | BIW |
| 150 | 38 bome | 10 | 1.61 | 0.9 | — | BIW | BIW | 20 | 1.56 | 0.9 | 1.3 | BIW | BIW | 30 | 1.43 | 2.1 | 2.0 | BIW | BIW | 48 bome | 10 | 1.62 | 0.3 | — | BIW | BIW | 20 | 1.59 | 0.6 | 2.6 | BIW | BIW | 30 | 1.52 | 4.4 | 4.2 | BIW | BIW |
| 200 | 38 bome | 10 | 1.64 | 0.9 | 0.7 | BIW | BIW | 20 | 1.61 | 3.2 | 2.75 | BIW | BIW | 30 | 1.39 | 4 | 4.3 | BIW | BIW | 48 bome | 10 | 1.63 | 1.1 | 1.1 | BIW | BIW | 20 | 1.53 | 4.6 | 4.25 | BIW | BIW | 30 | 1.41 | 9.1 | 12.3 | BIW | BIW |
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