Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand
Microbial-induced calcite precipitation (MICP) has been a promising method to improve geotechnical engineering properties through the precipitation of calcium carbonate (CaCO<sub>3</sub>) on the contact and surface of soil particles in recent years. In the present experiment, water absor...
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| author | Jitong Zhao Huawei Tong Yi Shan Jie Yuan Qiuwang Peng Junling Liang |
| author_facet | Jitong Zhao Huawei Tong Yi Shan Jie Yuan Qiuwang Peng Junling Liang |
| author_sort | Jitong Zhao |
| collection | DOAJ |
| description | Microbial-induced calcite precipitation (MICP) has been a promising method to improve geotechnical engineering properties through the precipitation of calcium carbonate (CaCO<sub>3</sub>) on the contact and surface of soil particles in recent years. In the present experiment, water absorption and unconfined compressive strength (UCS) tests were carried out to investigate the effects of three different fiber types (glass fiber, polyester fiber, and hemp fiber) on the physical and mechanical properties of MICP-treated calcareous sand. The fibers used were at 0%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, and 0.40% relative to the weight of the sand. The results showed that the failure strain and ductility of the samples could be improved by adding fibers. Compared to biocemented sand (BS), the water absorption of these three fiber-reinforced biocemented sands were, respectively, decreased by 11.60%, 21.18%, and 7.29%. UCS was, respectively, increased by 24.20%, 60.76%, and 6.40%. Polyester fiber produced the best effect, followed by glass fiber and hemp fiber. The optimum contents of glass fiber and polyester fiber were 0.20% and 0.25%, respectively. The optimum content of hemp fiber was within the range of 0.20–0.25%. Light-emitting diode (LED) microscope and scanning electron microscope (SEM) images lead to the conclusion that only a little calcite precipitation had occurred around the hemp fiber, leading to a poor bonding effect compared to the glass and polyester fibers. It was therefore suggested that polyester fiber should be used to improve the properties of biocemented sand. |
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| format | Article |
| id | doaj.art-2950d154a00f4a1d9e09cc6735782cb5 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T05:45:37Z |
| publishDate | 2021-01-01 |
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| series | Materials |
| spelling | doaj.art-2950d154a00f4a1d9e09cc6735782cb52023-12-03T12:21:24ZengMDPI AGMaterials1996-19442021-01-0114226810.3390/ma14020268Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous SandJitong Zhao0Huawei Tong1Yi Shan2Jie Yuan3Qiuwang Peng4Junling Liang5School of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaFoshan Railway Investment Construction Group Co., Ltd., Foshan 528000, ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaMicrobial-induced calcite precipitation (MICP) has been a promising method to improve geotechnical engineering properties through the precipitation of calcium carbonate (CaCO<sub>3</sub>) on the contact and surface of soil particles in recent years. In the present experiment, water absorption and unconfined compressive strength (UCS) tests were carried out to investigate the effects of three different fiber types (glass fiber, polyester fiber, and hemp fiber) on the physical and mechanical properties of MICP-treated calcareous sand. The fibers used were at 0%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, and 0.40% relative to the weight of the sand. The results showed that the failure strain and ductility of the samples could be improved by adding fibers. Compared to biocemented sand (BS), the water absorption of these three fiber-reinforced biocemented sands were, respectively, decreased by 11.60%, 21.18%, and 7.29%. UCS was, respectively, increased by 24.20%, 60.76%, and 6.40%. Polyester fiber produced the best effect, followed by glass fiber and hemp fiber. The optimum contents of glass fiber and polyester fiber were 0.20% and 0.25%, respectively. The optimum content of hemp fiber was within the range of 0.20–0.25%. Light-emitting diode (LED) microscope and scanning electron microscope (SEM) images lead to the conclusion that only a little calcite precipitation had occurred around the hemp fiber, leading to a poor bonding effect compared to the glass and polyester fibers. It was therefore suggested that polyester fiber should be used to improve the properties of biocemented sand.https://www.mdpi.com/1996-1944/14/2/268microbial-induced calcite precipitation (MICP)water absorptionunconfined compressive strength (UCS)glass, polyester, and hemp fibersbonding effect |
| spellingShingle | Jitong Zhao Huawei Tong Yi Shan Jie Yuan Qiuwang Peng Junling Liang Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand Materials microbial-induced calcite precipitation (MICP) water absorption unconfined compressive strength (UCS) glass, polyester, and hemp fibers bonding effect |
| title | Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand |
| title_full | Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand |
| title_fullStr | Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand |
| title_full_unstemmed | Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand |
| title_short | Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand |
| title_sort | effects of different types of fibers on the physical and mechanical properties of micp treated calcareous sand |
| topic | microbial-induced calcite precipitation (MICP) water absorption unconfined compressive strength (UCS) glass, polyester, and hemp fibers bonding effect |
| url | https://www.mdpi.com/1996-1944/14/2/268 |
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