Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement
Calcareous sand is developed by the fracture of marine biological skeleton under the impact of seawater. Calcareous sand is not transported in the process of deposition. Therefore, calcareous sand retains the characteristics of marine biological skeleton, low strength, and porous. In order to study...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/6639602 |
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| author | Wei Wang Jian Li Jun Hu |
| author_facet | Wei Wang Jian Li Jun Hu |
| author_sort | Wei Wang |
| collection | DOAJ |
| description | Calcareous sand is developed by the fracture of marine biological skeleton under the impact of seawater. Calcareous sand is not transported in the process of deposition. Therefore, calcareous sand retains the characteristics of marine biological skeleton, low strength, and porous. In order to study the effect of nanoclay and cement on the modification of calcareous sand, a series of tests were carried out on the modified cement calcareous sand (CCS) with different content of nanoclay. In this study, the triaxial mechanical properties and failure modes of nanoclay and cement composite modified calcareous sand (NCCS) were studied through the triaxial UU test. Then, SEM tests were carried out on CCS and NCCS samples, and the micromechanism of nanoclay and cement composite modified Nanhai calcareous sand was analyzed. The results showed that (1) the shear properties of CCS could be improved by adding nanoclay. The optimum admixture ratio of nanoclay was 8%, and its peak stress was 23%-39% higher than that of CCS. (2) The peak stress and strain of NCCS showed a linear correlation. (3) Compared with CCS, the internal friction angle and cohesion of NCCS were increased by 5.2% and 52%, respectively. (4) Nanoclay could improve the compactness and structure of cement calcareous sand, and the macroscopic performance is the improvement of peak stress and cohesion. |
| format | Article |
| id | doaj-art-f2339d11c6784c14be19878e990a4d25 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-f2339d11c6784c14be19878e990a4d252025-08-20T03:25:49ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/66396026639602Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and CementWei Wang0Jian Li1Jun Hu2School of Civil Engineering, Shaoxing University, Shaoxing, 312000, ChinaSchool of Civil Engineering, Shaoxing University, Shaoxing, 312000, ChinaCollege of Civil Engineering and Architecture, Hainan University, Haikou, 570228, ChinaCalcareous sand is developed by the fracture of marine biological skeleton under the impact of seawater. Calcareous sand is not transported in the process of deposition. Therefore, calcareous sand retains the characteristics of marine biological skeleton, low strength, and porous. In order to study the effect of nanoclay and cement on the modification of calcareous sand, a series of tests were carried out on the modified cement calcareous sand (CCS) with different content of nanoclay. In this study, the triaxial mechanical properties and failure modes of nanoclay and cement composite modified calcareous sand (NCCS) were studied through the triaxial UU test. Then, SEM tests were carried out on CCS and NCCS samples, and the micromechanism of nanoclay and cement composite modified Nanhai calcareous sand was analyzed. The results showed that (1) the shear properties of CCS could be improved by adding nanoclay. The optimum admixture ratio of nanoclay was 8%, and its peak stress was 23%-39% higher than that of CCS. (2) The peak stress and strain of NCCS showed a linear correlation. (3) Compared with CCS, the internal friction angle and cohesion of NCCS were increased by 5.2% and 52%, respectively. (4) Nanoclay could improve the compactness and structure of cement calcareous sand, and the macroscopic performance is the improvement of peak stress and cohesion.http://dx.doi.org/10.1155/2021/6639602 |
| spellingShingle | Wei Wang Jian Li Jun Hu Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement Geofluids |
| title | Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement |
| title_full | Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement |
| title_fullStr | Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement |
| title_full_unstemmed | Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement |
| title_short | Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement |
| title_sort | triaxial mechanical properties and micromechanism of calcareous sand modified by nanoclay and cement |
| url | http://dx.doi.org/10.1155/2021/6639602 |
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