Effect of Wet-Dry Cycles on the Mechanical Performances and Microstructure of Pisha Sandstone
The effects of the wet–dry cycles on the chemical compositions, microstructure, and mechanical properties of Pisha sandstone were experimentally investigated in the current study. A series of uniaxial compression tests were conducted to validate the deterioration of the mechanical property of specim...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-03-01
|
| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/28/6/2533 |
| _version_ | 1797609934155677696 |
|---|---|
| author | Yanbing Zhao Caiqian Yang Feng Qu Zhiren Wu Kejie Ding Zhishui Liang |
| author_facet | Yanbing Zhao Caiqian Yang Feng Qu Zhiren Wu Kejie Ding Zhishui Liang |
| author_sort | Yanbing Zhao |
| collection | DOAJ |
| description | The effects of the wet–dry cycles on the chemical compositions, microstructure, and mechanical properties of Pisha sandstone were experimentally investigated in the current study. A series of uniaxial compression tests were conducted to validate the deterioration of the mechanical property of specimens after wet–dry cycles. In addition, the evolutions of the mineral compositions and microstructure characteristics were confirmed by X-ray diffraction (XRD) and scanning electron microscope (SEM). Experimental results indicated that with the increase of wet–dry cycles, the mechanical properties of Pisha sandstone gradually decrease. After five wet–dry cycles, the uniaxial compressive strength, elastic modulus, and fracture energy of specimens were reduced by 41.06%, 62.39%, and 31.92%, respectively. The failure mode of the specimen changes from inclined shear failure to peel failure. Compared to the initial specimens, the relative content of primary minerals after five wet–dry cycles declined by 5.94%, and the relative content of clay minerals after five wet–dry cycles increased by 54.33%. Additionally, the porosity of samples exhibits a positive correlation with wet–dry cycles. Compared to the initial specimens, the porosity of specimens after five wet–dry cycles increased by 176.32%. Finally, a prediction model of the correlation between uniaxial compressive strength and porosity is proposed and verified. |
| first_indexed | 2024-03-11T06:08:31Z |
| format | Article |
| id | doaj.art-9e73d58715da4c70bbc3049c90783f8b |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T06:08:31Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-9e73d58715da4c70bbc3049c90783f8b2023-11-17T12:51:40ZengMDPI AGMolecules1420-30492023-03-01286253310.3390/molecules28062533Effect of Wet-Dry Cycles on the Mechanical Performances and Microstructure of Pisha SandstoneYanbing Zhao0Caiqian Yang1Feng Qu2Zhiren Wu3Kejie Ding4Zhishui Liang5Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, ChinaKey Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, ChinaKey Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, ChinaSchool of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, ChinaKey Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, ChinaKey Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, ChinaThe effects of the wet–dry cycles on the chemical compositions, microstructure, and mechanical properties of Pisha sandstone were experimentally investigated in the current study. A series of uniaxial compression tests were conducted to validate the deterioration of the mechanical property of specimens after wet–dry cycles. In addition, the evolutions of the mineral compositions and microstructure characteristics were confirmed by X-ray diffraction (XRD) and scanning electron microscope (SEM). Experimental results indicated that with the increase of wet–dry cycles, the mechanical properties of Pisha sandstone gradually decrease. After five wet–dry cycles, the uniaxial compressive strength, elastic modulus, and fracture energy of specimens were reduced by 41.06%, 62.39%, and 31.92%, respectively. The failure mode of the specimen changes from inclined shear failure to peel failure. Compared to the initial specimens, the relative content of primary minerals after five wet–dry cycles declined by 5.94%, and the relative content of clay minerals after five wet–dry cycles increased by 54.33%. Additionally, the porosity of samples exhibits a positive correlation with wet–dry cycles. Compared to the initial specimens, the porosity of specimens after five wet–dry cycles increased by 176.32%. Finally, a prediction model of the correlation between uniaxial compressive strength and porosity is proposed and verified.https://www.mdpi.com/1420-3049/28/6/2533Pisha sandstonemicrostructuremineral compositionsuniaxial compressive strengthwet–dry cycles |
| spellingShingle | Yanbing Zhao Caiqian Yang Feng Qu Zhiren Wu Kejie Ding Zhishui Liang Effect of Wet-Dry Cycles on the Mechanical Performances and Microstructure of Pisha Sandstone Molecules Pisha sandstone microstructure mineral compositions uniaxial compressive strength wet–dry cycles |
| title | Effect of Wet-Dry Cycles on the Mechanical Performances and Microstructure of Pisha Sandstone |
| title_full | Effect of Wet-Dry Cycles on the Mechanical Performances and Microstructure of Pisha Sandstone |
| title_fullStr | Effect of Wet-Dry Cycles on the Mechanical Performances and Microstructure of Pisha Sandstone |
| title_full_unstemmed | Effect of Wet-Dry Cycles on the Mechanical Performances and Microstructure of Pisha Sandstone |
| title_short | Effect of Wet-Dry Cycles on the Mechanical Performances and Microstructure of Pisha Sandstone |
| title_sort | effect of wet dry cycles on the mechanical performances and microstructure of pisha sandstone |
| topic | Pisha sandstone microstructure mineral compositions uniaxial compressive strength wet–dry cycles |
| url | https://www.mdpi.com/1420-3049/28/6/2533 |
| work_keys_str_mv | AT yanbingzhao effectofwetdrycyclesonthemechanicalperformancesandmicrostructureofpishasandstone AT caiqianyang effectofwetdrycyclesonthemechanicalperformancesandmicrostructureofpishasandstone AT fengqu effectofwetdrycyclesonthemechanicalperformancesandmicrostructureofpishasandstone AT zhirenwu effectofwetdrycyclesonthemechanicalperformancesandmicrostructureofpishasandstone AT kejieding effectofwetdrycyclesonthemechanicalperformancesandmicrostructureofpishasandstone AT zhishuiliang effectofwetdrycyclesonthemechanicalperformancesandmicrostructureofpishasandstone |