| AQ-TiO2 | aqueous solution containing TiO2 (P25) |
| SURF-noIMP | concrete cube with TiO2 (P25) on the surface, no impregnation |
| SURF-IMP | concrete cube with TiO2 (P25) on the surface, with impregnation |
| MIX | concrete cube with TiO2 (P25) distributed throughout the entire concrete mass |
| REF | reference concrete cube without TiO2 |
| Xe-arc | xenon lamp |
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