Oxide composition (in weight %) of samples after 18 d exposure to sulfuric acid at 90°C (pH 2·5 for 6 d followed by pH 0·5 for 12 d)
| Control | Core | Surface | Control | Core | Surface | |
|---|---|---|---|---|---|---|
| TSRC-1 | TSRC-2 | |||||
| Aluminium oxide | 48 | 49 | 48 | 35 | 32 | 21 |
| Silicon dioxide | 25 | 24 | 28 | 23 | 24 | 36 |
| Calcium oxide | 19 | 21 | 1·5 | 32 | 33 | 11 |
| Iron oxide | 4·3 | 4·8 | 4·9 | 6·1 | 6·0 | 7·6 |
| Potassium oxide | 2·0 | 1·0 | 3·3 | 1·3 | — | 2·7 |
| Titanium dioxide | 0·80 | — | 1·0 | 2·3 | 2·7 | 3·2 |
| Sulfur trioxide | — | — | 14 | — | 2·7 | 18 |
| Control | Core | Surface | Control | Core | Surface | |
|---|---|---|---|---|---|---|
| TSRC-1 | TSRC-2 | |||||
| Aluminium oxide | 48 | 49 | 48 | 35 | 32 | 21 |
| Silicon dioxide | 25 | 24 | 28 | 23 | 24 | 36 |
| Calcium oxide | 19 | 21 | 1·5 | 32 | 33 | 11 |
| Iron oxide | 4·3 | 4·8 | 4·9 | 6·1 | 6·0 | 7·6 |
| Potassium oxide | 2·0 | 1·0 | 3·3 | 1·3 | — | 2·7 |
| Titanium dioxide | 0·80 | — | 1·0 | 2·3 | 2·7 | 3·2 |
| Sulfur trioxide | — | — | 14 | — | 2·7 | 18 |
| TSRC-3 | TSRC-4 | |||||
|---|---|---|---|---|---|---|
| Aluminium oxide | 41 | 41 | 38 | 29 | 30 | 18 |
| Silicon dioxide | 35 | 31 | 35 | 35 | 32 | 48 |
| Calcium oxide | 13 | 12 | 6·4 | 24 | 25 | 13 |
| Iron oxide | 6·6 | 6·2 | 5·5 | 7·4 | 8·1 | 6·5 |
| Potassium oxide | 2·7 | 2·3 | 2·6 | 3·0 | 2·5 | 1·9 |
| Titanium dioxide | 1·3 | 1·1 | 1·0 | 2·1 | 2·5 | 2·8 |
| Sulfur trioxide | — | 7·0 | 11 | — | 2·3 | 13 |
| TSRC-3 | TSRC-4 | |||||
|---|---|---|---|---|---|---|
| Aluminium oxide | 41 | 41 | 38 | 29 | 30 | 18 |
| Silicon dioxide | 35 | 31 | 35 | 35 | 32 | 48 |
| Calcium oxide | 13 | 12 | 6·4 | 24 | 25 | 13 |
| Iron oxide | 6·6 | 6·2 | 5·5 | 7·4 | 8·1 | 6·5 |
| Potassium oxide | 2·7 | 2·3 | 2·6 | 3·0 | 2·5 | 1·9 |
| Titanium dioxide | 1·3 | 1·1 | 1·0 | 2·1 | 2·5 | 2·8 |
| Sulfur trioxide | — | 7·0 | 11 | — | 2·3 | 13 |
| CPC | Class G/silica | |||||
|---|---|---|---|---|---|---|
| Aluminium oxide | 29 | 35 | 27 | 2·9 | — | — |
| Silicon dioxide | 18 | 21 | 31 | 29 | 30 | 15 |
| Calcium oxide | 29 | 32 | 17 | 59 | 60 | 38 |
| Phosphorus pentoxide | 15 | 2·6 | 4·0 | — | — | — |
| Iron oxide | 5·1 | 5·5 | 6·3 | 5·5 | 5·7 | 1·2 |
| Potassium oxide | 1·9 | 0·8 | — | 0·9 | — | — |
| Titanium dioxide | 2·0 | 2·2 | 2·7 | 0·2 | 0·3 | — |
| Sulfur trioxide | — | — | 12 | 2·8 | 4·3 | 46 |
| CPC | Class G/silica | |||||
|---|---|---|---|---|---|---|
| Aluminium oxide | 29 | 35 | 27 | 2·9 | — | — |
| Silicon dioxide | 18 | 21 | 31 | 29 | 30 | 15 |
| Calcium oxide | 29 | 32 | 17 | 59 | 60 | 38 |
| Phosphorus pentoxide | 15 | 2·6 | 4·0 | — | — | — |
| Iron oxide | 5·1 | 5·5 | 6·3 | 5·5 | 5·7 | 1·2 |
| Potassium oxide | 1·9 | 0·8 | — | 0·9 | — | — |
| Titanium dioxide | 2·0 | 2·2 | 2·7 | 0·2 | 0·3 | — |
| Sulfur trioxide | — | — | 12 | 2·8 | 4·3 | 46 |
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