Driving mechanisms and hydro-chemical variation for assessing salt-induced weathering of sandstone in grotto relics
文献类型：期刊论文
| 作者 | Wang, Junxia2; Yan, Hongbin1; Ren, Weizhong2 |
| 刊名 | EARTH SURFACE PROCESSES AND LANDFORMS
 |
| 出版日期 | 2024-05-08 |
| 页码 | 15 |
| 关键词 | driving mechanisms field observation partial immersion salt-induced weathering spatial distribution |
| ISSN号 | 0197-9337 |
| DOI | 10.1002/esp.5862 |
| 英文摘要 | Salt weathering is considered as one of the most damaging processes acting on cultural heritage sites and salt crystallization significantly contributes to the deterioration of natural sandstone in grotto relics. A laboratory partial immersion experiment was carried out to elucidate how humidity influences the salt-induced weathering in grotto relics. Field environmental observations at the Yungang Grottoes were conducted to evaluate the differences between experimental endeavours and field observations. Superficial salt accumulation was characterized by hydro-chemical and quantitative atomistic analysis. It revealed the co-existence of calcium sulphate and magnesium sulphate, with a Ca/Mg molar ratio of 0.27 at RHam and 4.13-18.15 at a constant RH. An average increase of 165 mg/L in Na+ concentration and 120.7 mg/L in Mg2+ concentration in the groundwater was detected after immersion, which was attributed to the dissolution of the sandstone rock. The reduction of 322.5 mg/L in the SO42- concentration in the groundwater after partial immersion shows that capillary forces influence the migration of SO42- from the immersion solution. Calcium sulphate and magnesium sulphate accumulation with a Ca/Mg molar ratio of 0.03-0.17 in the field environment is strongly correlated with the occurrence of salt efflorescence. The upward transport of soluble salt was driven by capillary forces after partial immersion in the groundwater collected from the Yungang Grottoes. It then migrated from the interior to the exterior of the sandstone specimen due to evaporation. Salt efflorescence formed on the upper exposed stone close to the capillary fringe owing to the combined effects of condensation, hygroscopicity and evaporation. These processes were driven by wetting-drying and dissolution-crystallization cycles in response to fluctuating environmental conditions. These results contribute to a better understanding the mechanism of salt-induced weathering and provide a basis for future conservation to mitigate the harmful impact of salts in heritage sites. Laboratory partial immersion experiments were conducted to elucidate how humidity influences the salt-induced weathering in grotto relics. Loose efflorescence was preferentially formed at RHam and smaller crystals with dense arrangements were obtained under constant RH conditions. It revealed the co-existence of CaSO4 and MgSO4 with a Ca/Mg molar ratio of 0.27 at RHam and 4.13-18.15 at a constant RH. Salt efflorescence formed owing to the combined effects of condensation, hygroscopicity and evaporation, driven by wetting-drying and dissolution-crystallization cycles. image |
| 资助项目 | National Key R&D Program of China ; Science and Technology Project for Cultural Relic Conservation of Shanxi Culture Relics Bureau[208141400237] ; [2021YFC1523400] |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001215751700001 |
| 出版者 | WILEY |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/41201]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Wang, Junxia |
| 作者单位 | 1.Yungang Res Inst, Datong, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Junxia,Yan, Hongbin,Ren, Weizhong. Driving mechanisms and hydro-chemical variation for assessing salt-induced weathering of sandstone in grotto relics[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2024:15. |
| APA | Wang, Junxia,Yan, Hongbin,&Ren, Weizhong.(2024).Driving mechanisms and hydro-chemical variation for assessing salt-induced weathering of sandstone in grotto relics.EARTH SURFACE PROCESSES AND LANDFORMS,15. |
| MLA | Wang, Junxia,et al."Driving mechanisms and hydro-chemical variation for assessing salt-induced weathering of sandstone in grotto relics".EARTH SURFACE PROCESSES AND LANDFORMS (2024):15. |
入库方式： OAI收割
来源：武汉岩土力学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。