Feasibility of Stabilized Zn and Pb Contaminated Soils as Roadway Subgrade Materials
The authors have developed a new binder, KMP, which is made from oxalic acid-activated phosphate rock, monopotassium phosphate (KH2PO4), and reactive magnesia (MgO). This study explores the acid neutralization capacity, strength characteristics, water-soaking durability, resilient modulus, and pore...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/1025056 |
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| author | Mingli Wei Hao Ni Shiji Zhou Yuan Li |
| author_facet | Mingli Wei Hao Ni Shiji Zhou Yuan Li |
| author_sort | Mingli Wei |
| collection | DOAJ |
| description | The authors have developed a new binder, KMP, which is made from oxalic acid-activated phosphate rock, monopotassium phosphate (KH2PO4), and reactive magnesia (MgO). This study explores the acid neutralization capacity, strength characteristics, water-soaking durability, resilient modulus, and pore size distribution of KMP stabilized soils with individual Zn, Pb, or coexisting Zn and Pb contaminants. For comparison purpose, Portland cement (PC) is also tested. The results show that KMP stabilized soils have a higher acid buffering capacity than PC stabilized soils, regardless of the soil contamination conditions. The water stability coefficient and resilient modulus of the KMP stabilized soils are found to be higher than PC stabilized soils. The reasons for the differences in these properties between KMP and PC stabilized soils are interpreted based on the stability and dissolubility of the main hydration products of the KMP and PC stabilized soils, the soil pore distribution, and concentration of Mg or Ca leached from the KMP and PC stabilized soils obtained from the acid neutralization capacity tests. Overall, this study demonstrates that the KMP is effective in stabilizing soils that are contaminated with Zn or Pb alone and mixed Zn and Pb contaminants, and the KMP stabilized soils are better suited as roadway subgrade material. |
| format | Article |
| id | doaj-art-cbb83df3b4c848b094d6165da9804103 |
| 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-cbb83df3b4c848b094d6165da98041032025-02-03T06:05:46ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/10250561025056Feasibility of Stabilized Zn and Pb Contaminated Soils as Roadway Subgrade MaterialsMingli Wei0Hao Ni1Shiji Zhou2Yuan Li3Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, ChinaJiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, ChinaJiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaThe authors have developed a new binder, KMP, which is made from oxalic acid-activated phosphate rock, monopotassium phosphate (KH2PO4), and reactive magnesia (MgO). This study explores the acid neutralization capacity, strength characteristics, water-soaking durability, resilient modulus, and pore size distribution of KMP stabilized soils with individual Zn, Pb, or coexisting Zn and Pb contaminants. For comparison purpose, Portland cement (PC) is also tested. The results show that KMP stabilized soils have a higher acid buffering capacity than PC stabilized soils, regardless of the soil contamination conditions. The water stability coefficient and resilient modulus of the KMP stabilized soils are found to be higher than PC stabilized soils. The reasons for the differences in these properties between KMP and PC stabilized soils are interpreted based on the stability and dissolubility of the main hydration products of the KMP and PC stabilized soils, the soil pore distribution, and concentration of Mg or Ca leached from the KMP and PC stabilized soils obtained from the acid neutralization capacity tests. Overall, this study demonstrates that the KMP is effective in stabilizing soils that are contaminated with Zn or Pb alone and mixed Zn and Pb contaminants, and the KMP stabilized soils are better suited as roadway subgrade material.http://dx.doi.org/10.1155/2020/1025056 |
| spellingShingle | Mingli Wei Hao Ni Shiji Zhou Yuan Li Feasibility of Stabilized Zn and Pb Contaminated Soils as Roadway Subgrade Materials Advances in Materials Science and Engineering |
| title | Feasibility of Stabilized Zn and Pb Contaminated Soils as Roadway Subgrade Materials |
| title_full | Feasibility of Stabilized Zn and Pb Contaminated Soils as Roadway Subgrade Materials |
| title_fullStr | Feasibility of Stabilized Zn and Pb Contaminated Soils as Roadway Subgrade Materials |
| title_full_unstemmed | Feasibility of Stabilized Zn and Pb Contaminated Soils as Roadway Subgrade Materials |
| title_short | Feasibility of Stabilized Zn and Pb Contaminated Soils as Roadway Subgrade Materials |
| title_sort | feasibility of stabilized zn and pb contaminated soils as roadway subgrade materials |
| url | http://dx.doi.org/10.1155/2020/1025056 |
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