Effects of Biostabilization on Engineering Properties of Geomaterials
Biostabilization is a newly proposed method to improve the strength and durability of geomaterials, and it can serve as an alternative to chemical and mechanical stabilization. The objectives of this study are to perform biostabilization treatments for selected roadway construction geomaterials and...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/6654213 |
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| author | Shengting Li Chenyi Luo Yi Yang Lvzhen Yang Lijian Wu Tuo Huang Zhuangji Wang |
| author_facet | Shengting Li Chenyi Luo Yi Yang Lvzhen Yang Lijian Wu Tuo Huang Zhuangji Wang |
| author_sort | Shengting Li |
| collection | DOAJ |
| description | Biostabilization is a newly proposed method to improve the strength and durability of geomaterials, and it can serve as an alternative to chemical and mechanical stabilization. The objectives of this study are to perform biostabilization treatments for selected roadway construction geomaterials and to evaluate the biostabilization effects on engineering properties of the geomaterials. Three types of geomaterials were selected, and two of them were compacted soil from unpaved road surface. Bacillus pasteurii, the biostabilization bacterium, was used to induce mineral precipitates within the geomaterial pore spaces, where the biostabilization effects were performed. Two types of liquid incubation media, containing NH4Cl or (NH4)2 SO4, were applied for bacteria culturing. Unconfined compression, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) measurements were conducted to evaluate the biostabilization results. From unconfined compression, sample strength performance was improved by the biostabilization treatments; the benefits of biostabilization were pronounced by a relatively long culturing time and an oven-dry procedure; the liquid culturing medium containing NH4Cl performed better than the medium containing (NH4)2 SO4. After biostabilization, SEM photographs provided direct evidence for the precipitates induced by bacteria within the geomaterial pore space. The precipitates either connected the adjoined particles or partially covered the particle surface, which increased the surface roughness. EDS and XRD results indicated that calcite, dolomite, and albite were the major precipitates produced during biostabilization treatments. In conclusion, biostabilization ameliorated the microstructures of the geomaterials and improved their strength. Future research topics should include the applications of biostabilization for in situ road construction. |
| format | Article |
| id | doaj-art-2e1d68951d424314aa2eefecab690ed5 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-2e1d68951d424314aa2eefecab690ed52025-02-03T01:05:30ZengWileyAdvances in Civil Engineering1687-80861687-80942021-01-01202110.1155/2021/66542136654213Effects of Biostabilization on Engineering Properties of GeomaterialsShengting Li0Chenyi Luo1Yi Yang2Lvzhen Yang3Lijian Wu4Tuo Huang5Zhuangji Wang6Key Laboratory of Transport Industry of Road Structure and Material, Ministry of Transport, Research Institute of Highway, Beijing 100088, ChinaSchool of Life Science, Beijing University of Chinese Medicine, Beijing 102488, ChinaXiandai Investment Co., Ltd., School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha, Hunan 410076, ChinaSchool of Road and Bridge Engineering, Hunan Communication Polytechnic, Huangxing Zhen, Changsha, Hunan 410132, ChinaKey Laboratory of Transport Industry of Road Structure and Material, Ministry of Transport, Research Institute of Highway, Beijing 100088, ChinaSchool of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha, Hunan 410076, ChinaDepartment of Plant Science and Landscape Architecture, University of Maryland, College Park, MD 20742, USABiostabilization is a newly proposed method to improve the strength and durability of geomaterials, and it can serve as an alternative to chemical and mechanical stabilization. The objectives of this study are to perform biostabilization treatments for selected roadway construction geomaterials and to evaluate the biostabilization effects on engineering properties of the geomaterials. Three types of geomaterials were selected, and two of them were compacted soil from unpaved road surface. Bacillus pasteurii, the biostabilization bacterium, was used to induce mineral precipitates within the geomaterial pore spaces, where the biostabilization effects were performed. Two types of liquid incubation media, containing NH4Cl or (NH4)2 SO4, were applied for bacteria culturing. Unconfined compression, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) measurements were conducted to evaluate the biostabilization results. From unconfined compression, sample strength performance was improved by the biostabilization treatments; the benefits of biostabilization were pronounced by a relatively long culturing time and an oven-dry procedure; the liquid culturing medium containing NH4Cl performed better than the medium containing (NH4)2 SO4. After biostabilization, SEM photographs provided direct evidence for the precipitates induced by bacteria within the geomaterial pore space. The precipitates either connected the adjoined particles or partially covered the particle surface, which increased the surface roughness. EDS and XRD results indicated that calcite, dolomite, and albite were the major precipitates produced during biostabilization treatments. In conclusion, biostabilization ameliorated the microstructures of the geomaterials and improved their strength. Future research topics should include the applications of biostabilization for in situ road construction.http://dx.doi.org/10.1155/2021/6654213 |
| spellingShingle | Shengting Li Chenyi Luo Yi Yang Lvzhen Yang Lijian Wu Tuo Huang Zhuangji Wang Effects of Biostabilization on Engineering Properties of Geomaterials Advances in Civil Engineering |
| title | Effects of Biostabilization on Engineering Properties of Geomaterials |
| title_full | Effects of Biostabilization on Engineering Properties of Geomaterials |
| title_fullStr | Effects of Biostabilization on Engineering Properties of Geomaterials |
| title_full_unstemmed | Effects of Biostabilization on Engineering Properties of Geomaterials |
| title_short | Effects of Biostabilization on Engineering Properties of Geomaterials |
| title_sort | effects of biostabilization on engineering properties of geomaterials |
| url | http://dx.doi.org/10.1155/2021/6654213 |
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