Strength and Pore Structure Development of High-Plasticity Clay Treated with MK-Blended Cement
This paper focuses on the strength development and pore structure evolution of high-plasticity clay mixtures treated with metakaolin- (MK-) blended ordinary Portland cement (OPC). The unconfined compressive strength (fcu) of treated soil mixtures is measured to study the effect of MK replacement. Th...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/2527892 |
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| author | Qian Guo Mingli Wei Haochen Xue Changhui Gao Guangyin Du |
| author_facet | Qian Guo Mingli Wei Haochen Xue Changhui Gao Guangyin Du |
| author_sort | Qian Guo |
| collection | DOAJ |
| description | This paper focuses on the strength development and pore structure evolution of high-plasticity clay mixtures treated with metakaolin- (MK-) blended ordinary Portland cement (OPC). The unconfined compressive strength (fcu) of treated soil mixtures is measured to study the effect of MK replacement. The microstructural study is carried out by mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results showed that the MK replacement led to the decrease of unconfined compressive strength of OPC-treated soil mixture cured for 28 days, but the influence on 7 days strength was negligible. However, the MK addition also enhanced the unconfined compressive strength significantly. The MK addition provided more cementitious products by secondary hydration and pozzolanic reaction, which would give rise to a notable filling effect by turning the large pores (1 to 10 μm) into smaller ones (0.1 to 1 μm). However, the MK replacement led to a decrease of cementitious products due to the lack of calcium hydroxide (CH) in soil mixture, and thus the effect on pore structure refinement was reduced. Nevertheless, the presence of MK enhanced the unconfined compressive strength cured for 7 days, due to the high reactivity of MK with CH. |
| format | Article |
| id | doaj-art-7fe34bbfc1f24339b9360ef8ff241629 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-7fe34bbfc1f24339b9360ef8ff2416292025-08-20T03:35:19ZengWileyAdvances in Civil Engineering1687-80861687-80942019-01-01201910.1155/2019/25278922527892Strength and Pore Structure Development of High-Plasticity Clay Treated with MK-Blended CementQian Guo0Mingli Wei1Haochen Xue2Changhui Gao3Guangyin Du4Institute of Geotechnical Engineering, Southeast University, Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety Nanjing, Nanjing, Jiangsu 211189, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, ChinaInstitute of Communications Planning, Design & Research, Hangzhou, Zhejiang 310058, ChinaInstitute of Geotechnical Engineering, Southeast University, Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety Nanjing, Nanjing, Jiangsu 211189, ChinaInstitute of Geotechnical Engineering, Southeast University, Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety Nanjing, Nanjing, Jiangsu 211189, ChinaThis paper focuses on the strength development and pore structure evolution of high-plasticity clay mixtures treated with metakaolin- (MK-) blended ordinary Portland cement (OPC). The unconfined compressive strength (fcu) of treated soil mixtures is measured to study the effect of MK replacement. The microstructural study is carried out by mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results showed that the MK replacement led to the decrease of unconfined compressive strength of OPC-treated soil mixture cured for 28 days, but the influence on 7 days strength was negligible. However, the MK addition also enhanced the unconfined compressive strength significantly. The MK addition provided more cementitious products by secondary hydration and pozzolanic reaction, which would give rise to a notable filling effect by turning the large pores (1 to 10 μm) into smaller ones (0.1 to 1 μm). However, the MK replacement led to a decrease of cementitious products due to the lack of calcium hydroxide (CH) in soil mixture, and thus the effect on pore structure refinement was reduced. Nevertheless, the presence of MK enhanced the unconfined compressive strength cured for 7 days, due to the high reactivity of MK with CH.http://dx.doi.org/10.1155/2019/2527892 |
| spellingShingle | Qian Guo Mingli Wei Haochen Xue Changhui Gao Guangyin Du Strength and Pore Structure Development of High-Plasticity Clay Treated with MK-Blended Cement Advances in Civil Engineering |
| title | Strength and Pore Structure Development of High-Plasticity Clay Treated with MK-Blended Cement |
| title_full | Strength and Pore Structure Development of High-Plasticity Clay Treated with MK-Blended Cement |
| title_fullStr | Strength and Pore Structure Development of High-Plasticity Clay Treated with MK-Blended Cement |
| title_full_unstemmed | Strength and Pore Structure Development of High-Plasticity Clay Treated with MK-Blended Cement |
| title_short | Strength and Pore Structure Development of High-Plasticity Clay Treated with MK-Blended Cement |
| title_sort | strength and pore structure development of high plasticity clay treated with mk blended cement |
| url | http://dx.doi.org/10.1155/2019/2527892 |
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