Cit:Shen.etal:2014
| Autor | Shen, Y.X. and Chen, W.W. and Kuang, J. and Du, W.F. |
| Jahr | 2014 |
| Titel | Experimental study on salt deterioration of salt contaminated earthen materials under dry-wet cycles |
| Bibtex | |
| DOI | 10.5165/hawk-hhg/269 |
| Link | Datei:15 SWBSS-2014 Shen etal.pdf |
| Bemerkungen | In: De Clercq, Hilde (editor): Proceedings of SWBSS 2014. Third International Conference on Salt Weathering of Buildings and Stone Sculptures Royal Institute for Cultural Heritage, Brussels, Belgium, 14-16 October 2042, S. 211-222 |
Eintrag in der Bibliographie
| [Shen.etal:2014] | Shen, Y.X.; Chen, W.W.; Kuang, J.; Du, W.F. (2014): Experimental study on salt deterioration of salt contaminated earthen materials under dry-wet cycles. In: Hilde De Clercq (Hrsg.): Proceedings of SWBSS 2014 3rd International Conference on Salt Weathering of Buildings and Stone Sculptures,KIK-IRPA, Royal Institute for Cultural Heritage Brussels 211-222, 10.5165/hawk-hhg/269. |   |
Keywords[Bearbeiten]
Jiaohe Ruins, dry-wet cycles, mechanical properties, wind erosion, salt crystallisation
Abstract[Bearbeiten]
On the Silk Road in the northwest of China, there is a large number of precious ancient relics, such as the Great Wall with beacon towers and castles, the Jiaohe Ruins etc. Most of these ancient relics are earthen architecture sites, which is different from many monuments that are usually made of rocks or metal materials. Specifically, these ancient relics have suffered different levels of deterioration due to long term dry-wet cycles in this typical arid and semi-arid region. The damage patterns have been studied by field investigations, and the dynamics of salt precipitation have been confirmed to be crucial for understanding the deterioration mechanism in these earthen relics. However, the influence of the nature of the salt and its content on the mechanical properties and erosion responses of relic soils under dry-wet cycles are not well understood. In the present research, the deterioration of the saline ancient relics soil under dry-wet cycles was investigated in comparison to the mechanical properties (i.e., direct shear test, unconfined compression test and tensile test) and the effect of erosion response to artificial sandstorms. The specimens studied were remoulded samples from the Jiaohe Ruins loaded with different concentrations of NaCl, Na2SO4 and a mixture of these two salts. Meanwhile, the deterioration process was monitored by an ultrasonic test. It is found that the P-wave velocity decreases with increasing number of dry-wet cycles and the salts added to the samples accelerate the deterioration process. The degree of deterioration is reflected by the decrease of shear strength, compression strength and tensile strength of the relic soils. We also conducted wind erosion tests to investigate the erosion characteristics of remoulded samples by considering different salt distributions. The results indicate that most serious deterioration is on the surface of the samples due to salt crystallisation. Na2SO4 contributed most of the surface weathering of the soils while NaCl played little role in the weathering.