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Comparison of geopolymer strength and OPC.
| Grade | Standard | Brittleness | Toughness |
|---|---|---|---|
| C25 | SS22 (20% alkali, M0.4) |
SS17 (18% alkali, M0.4) |
|
| C30 | SS18, SS20 (18% alkali, M0.6, M1.2) |
SS21, SS26, SS31 (18–22% alkali, M1.4) |
SS16, SS27 (22% alkali M0.4–M0.6) |
| C35 | SS19, SS24, SS28 (18–22% alkali, M1–M0.8) |
SS25, SS29 (20–22% alkali, M1–1.2) |
SS30 (22% alkali, M1.2) |
| C40 | SS15, SS23 (20% alkali, M0.6–M0.8) |
||
| C45 | SS14 (18% alkali, M0.8) |
