Influence of Organic Content on the Mechanical Properties of Organic-Rich Soils Stabilized with CaO-GGBS Binder and PC
Organic-rich soil is a typical special soil often encountered in foundation treatment. Previous research has revealed that Portland cement (PC) not only pollutes the environment but is significantly affected by organic matter during its hydration and cementation. Although quicklime (CaO)-GGBS binder...
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MDPI AG
2022-09-01
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| author | Yuqing Zhong Guanghua Cai Shiquan Wang Huajin Qin Caihong Zhang Jiangshan Li |
| author_facet | Yuqing Zhong Guanghua Cai Shiquan Wang Huajin Qin Caihong Zhang Jiangshan Li |
| author_sort | Yuqing Zhong |
| collection | DOAJ |
| description | Organic-rich soil is a typical special soil often encountered in foundation treatment. Previous research has revealed that Portland cement (PC) not only pollutes the environment but is significantly affected by organic matter during its hydration and cementation. Although quicklime (CaO)-GGBS binder (CG) is an effective alternative to PC, its efficiency in treating organic-rich soils has not been studied. In this study, organic-rich soil was treated with two binders of CG and PC. The physical, mechanical, and chemical characteristics of the stabilized soils were tested at various organic contents, binder contents, and curing ages. The results show that the cracks in two treated soils increase with the increase in organic content and the reduction in binder content. CG-treated soils are more likely to shed big lumps after damage than PC-treated soils. The unconfined compressive strength (<i>q</i><sub>u</sub>) and deformation modulus (<i>E</i><sub>50</sub>) of stabilized soils increase with the increasing curing age and binder content but the decreasing organic content. The <i>E</i><sub>50</sub> of PC-treated soil is about 22~73 times <i>q</i><sub>u</sub>, and the <i>E</i><sub>50</sub> of CG-treated soil shows an excellent linear relationship with <i>q</i><sub>u</sub>. The moisture content of two treated soils increases as the organic content grows, but it falls as the curing age and binder content increase. The soil pH rises with the increasing organic content and binder content, but it declines with increased curing age. The strength development of organic-rich soils treated by the CG binder has an evident attenuation with the organic content. Given its possible environmental benefit, alkali (especially low calcium)-activated binder is appropriate for practical engineering with modest strength needs. |
| first_indexed | 2024-03-09T20:58:29Z |
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| language | English |
| last_indexed | 2024-03-09T20:58:29Z |
| publishDate | 2022-09-01 |
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| series | Water |
| spelling | doaj.art-9652c23c72a84d9bbdd248469b44d5ec2023-11-23T22:15:00ZengMDPI AGWater2073-44412022-09-011419305310.3390/w14193053Influence of Organic Content on the Mechanical Properties of Organic-Rich Soils Stabilized with CaO-GGBS Binder and PCYuqing Zhong0Guanghua Cai1Shiquan Wang2Huajin Qin3Caihong Zhang4Jiangshan Li5College of Civil and Engineering, Nanjing Forestry University, Nanjing 210037, ChinaCollege of Civil and Engineering, Nanjing Forestry University, Nanjing 210037, ChinaSchool of Resources and Civil Engineering, Suzhou University, Suzhou 234000, ChinaSchool of Resources and Civil Engineering, Suzhou University, Suzhou 234000, ChinaCollege of Civil and Engineering, Nanjing Forestry University, Nanjing 210037, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaOrganic-rich soil is a typical special soil often encountered in foundation treatment. Previous research has revealed that Portland cement (PC) not only pollutes the environment but is significantly affected by organic matter during its hydration and cementation. Although quicklime (CaO)-GGBS binder (CG) is an effective alternative to PC, its efficiency in treating organic-rich soils has not been studied. In this study, organic-rich soil was treated with two binders of CG and PC. The physical, mechanical, and chemical characteristics of the stabilized soils were tested at various organic contents, binder contents, and curing ages. The results show that the cracks in two treated soils increase with the increase in organic content and the reduction in binder content. CG-treated soils are more likely to shed big lumps after damage than PC-treated soils. The unconfined compressive strength (<i>q</i><sub>u</sub>) and deformation modulus (<i>E</i><sub>50</sub>) of stabilized soils increase with the increasing curing age and binder content but the decreasing organic content. The <i>E</i><sub>50</sub> of PC-treated soil is about 22~73 times <i>q</i><sub>u</sub>, and the <i>E</i><sub>50</sub> of CG-treated soil shows an excellent linear relationship with <i>q</i><sub>u</sub>. The moisture content of two treated soils increases as the organic content grows, but it falls as the curing age and binder content increase. The soil pH rises with the increasing organic content and binder content, but it declines with increased curing age. The strength development of organic-rich soils treated by the CG binder has an evident attenuation with the organic content. Given its possible environmental benefit, alkali (especially low calcium)-activated binder is appropriate for practical engineering with modest strength needs.https://www.mdpi.com/2073-4441/14/19/3053CaO-GGBS binderPCorganic-rich soilsodium humateunconfined compressive strength |
| spellingShingle | Yuqing Zhong Guanghua Cai Shiquan Wang Huajin Qin Caihong Zhang Jiangshan Li Influence of Organic Content on the Mechanical Properties of Organic-Rich Soils Stabilized with CaO-GGBS Binder and PC Water CaO-GGBS binder PC organic-rich soil sodium humate unconfined compressive strength |
| title | Influence of Organic Content on the Mechanical Properties of Organic-Rich Soils Stabilized with CaO-GGBS Binder and PC |
| title_full | Influence of Organic Content on the Mechanical Properties of Organic-Rich Soils Stabilized with CaO-GGBS Binder and PC |
| title_fullStr | Influence of Organic Content on the Mechanical Properties of Organic-Rich Soils Stabilized with CaO-GGBS Binder and PC |
| title_full_unstemmed | Influence of Organic Content on the Mechanical Properties of Organic-Rich Soils Stabilized with CaO-GGBS Binder and PC |
| title_short | Influence of Organic Content on the Mechanical Properties of Organic-Rich Soils Stabilized with CaO-GGBS Binder and PC |
| title_sort | influence of organic content on the mechanical properties of organic rich soils stabilized with cao ggbs binder and pc |
| topic | CaO-GGBS binder PC organic-rich soil sodium humate unconfined compressive strength |
| url | https://www.mdpi.com/2073-4441/14/19/3053 |
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