Assessment of sandstone deterioration at Ta Keo temple (Angkor): first results and future prospects

摘要: A first application of geomorphological methods to the assessment sandstone deterioration at Angkor is presented. Damage diagnosis was carried out on eastern tier central pyramid 1,000 year-old Ta Keo temple. Methods combine field observations and measurements 230 sampling points, high-resolution lasergrammetry stereophotogrammetry a 2-m2 test zone, SEM observations. The results indicate that decay operates through synergistic combination weathering phenomena dominated by scaling solution, exhibits high spatial variability. Percentages deteriorated surfaces vary from 17.6 93.8%, average stone recession values 0.00 2.71 cm (minimum) 0.34 5.49 (maximum). On test-zone, 3D-mapping present reconstructed initial states using erosion scars up 6 deep have formed since 1963. whole, amount more than tripled between 1963 2008. degree implication salts in remains unclear for most efflorescences are composed calcite (CaCO3), with secondary importance barite (BaSO4) gypsum (CaSO4 2H2O). Future prospects aim evaluate impact clearing temple forest 1920s.