Mechanical Properties of Weathered Feldspar Sandstone after Experiencing Dry-Wet Cycles
Weathering is one of the important geological hazards to many stone cultural relics carved on feldspar sandstone (such as the Datong Yungang Grottoes). To study the mechanical properties of the weathered Yungang Grottoes, feldspar sandstone was subjected to comparative dry-wet cycle tests with water...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2020-01-01
|
| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/6268945 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841524435449806848 |
|---|---|
| author | Wen-bo An Laigui Wang He Chen |
| author_facet | Wen-bo An Laigui Wang He Chen |
| author_sort | Wen-bo An |
| collection | DOAJ |
| description | Weathering is one of the important geological hazards to many stone cultural relics carved on feldspar sandstone (such as the Datong Yungang Grottoes). To study the mechanical properties of the weathered Yungang Grottoes, feldspar sandstone was subjected to comparative dry-wet cycle tests with water-rock interaction (Group A) and salt-rock interaction (Group B). The variation patterns of the macroscopic physical and mechanical parameters as well as the micro/mesoscopic structures of the two groups of feldspar sandstone with the number of dry-wet cycles were measured. The results showed that for the Group A and Group B sandstones, as the number of dry-wet cycles increased the saturated water absorption and the longitudinal wave velocity increased, with the maximum variation rates reaching 28.02%, 36.98%, 16.20%, and 33.27%. The peak strength and elastic modulus gradually decreased, with the maximum variation rate reaching 48.53%, 73.44%, 26.61%, and 72.39%. The surface height deviation increased by as much as 1.06 μm and 3.34 μm. The mechanism of weathering for the water-rock interaction included three effects, namely, the hydrolysis of the K-Na feldspar, the water swelling of the clay minerals such as kaolinite, and the dissolution of the soluble minerals. The mechanism of weathering for the salt-rock interaction included salt crystallization in the pores or fissures and chemical reactions between the minerals (such as feldspar and calcite) and sulfate, in addition to the above three effects. Therefore, the crystallization stress of the salt exerted the most notable effect on the deterioration of the feldspar sandstone. The results are expected to provide a reference for the stability evaluation and protection of the rock mass of the Grottoes. |
| format | Article |
| id | doaj-art-1839f9b777604191af9b501e2a7c9f43 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-1839f9b777604191af9b501e2a7c9f432025-02-03T05:53:09ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/62689456268945Mechanical Properties of Weathered Feldspar Sandstone after Experiencing Dry-Wet CyclesWen-bo An0Laigui Wang1He Chen2College of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, ChinaCollege of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, ChinaCollege of Civil and Engineering, Liaoning Technical University, Fuxin 123000, ChinaWeathering is one of the important geological hazards to many stone cultural relics carved on feldspar sandstone (such as the Datong Yungang Grottoes). To study the mechanical properties of the weathered Yungang Grottoes, feldspar sandstone was subjected to comparative dry-wet cycle tests with water-rock interaction (Group A) and salt-rock interaction (Group B). The variation patterns of the macroscopic physical and mechanical parameters as well as the micro/mesoscopic structures of the two groups of feldspar sandstone with the number of dry-wet cycles were measured. The results showed that for the Group A and Group B sandstones, as the number of dry-wet cycles increased the saturated water absorption and the longitudinal wave velocity increased, with the maximum variation rates reaching 28.02%, 36.98%, 16.20%, and 33.27%. The peak strength and elastic modulus gradually decreased, with the maximum variation rate reaching 48.53%, 73.44%, 26.61%, and 72.39%. The surface height deviation increased by as much as 1.06 μm and 3.34 μm. The mechanism of weathering for the water-rock interaction included three effects, namely, the hydrolysis of the K-Na feldspar, the water swelling of the clay minerals such as kaolinite, and the dissolution of the soluble minerals. The mechanism of weathering for the salt-rock interaction included salt crystallization in the pores or fissures and chemical reactions between the minerals (such as feldspar and calcite) and sulfate, in addition to the above three effects. Therefore, the crystallization stress of the salt exerted the most notable effect on the deterioration of the feldspar sandstone. The results are expected to provide a reference for the stability evaluation and protection of the rock mass of the Grottoes.http://dx.doi.org/10.1155/2020/6268945 |
| spellingShingle | Wen-bo An Laigui Wang He Chen Mechanical Properties of Weathered Feldspar Sandstone after Experiencing Dry-Wet Cycles Advances in Materials Science and Engineering |
| title | Mechanical Properties of Weathered Feldspar Sandstone after Experiencing Dry-Wet Cycles |
| title_full | Mechanical Properties of Weathered Feldspar Sandstone after Experiencing Dry-Wet Cycles |
| title_fullStr | Mechanical Properties of Weathered Feldspar Sandstone after Experiencing Dry-Wet Cycles |
| title_full_unstemmed | Mechanical Properties of Weathered Feldspar Sandstone after Experiencing Dry-Wet Cycles |
| title_short | Mechanical Properties of Weathered Feldspar Sandstone after Experiencing Dry-Wet Cycles |
| title_sort | mechanical properties of weathered feldspar sandstone after experiencing dry wet cycles |
| url | http://dx.doi.org/10.1155/2020/6268945 |
| work_keys_str_mv | AT wenboan mechanicalpropertiesofweatheredfeldsparsandstoneafterexperiencingdrywetcycles AT laiguiwang mechanicalpropertiesofweatheredfeldsparsandstoneafterexperiencingdrywetcycles AT hechen mechanicalpropertiesofweatheredfeldsparsandstoneafterexperiencingdrywetcycles |