Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand.
Effects of Different Types of Fibers on the Physical and Mechanical Properties of MICP-Treated Calcareous Sand.
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不同类型纤维对MICP处理钙质砂物理力学性能的影响
DOI：
10.3390/ma14020268
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发表时间：
2021-01-07
期刊：
影响因子：
--
通讯作者：
Liang J
中科院分区：
文献类型：
--
作者：
Zhao J;Tong H;Shan Y;Yuan J;Peng Q;Liang J
微生物诱导方解石沉淀（Microbial-induced calcite precipitation，MICP）是近年来发展起来的一种通过碳酸钙（CaCO 3）在土颗粒接触面和表面的沉淀来改善岩土工程性质的方法。通过吸水率和无侧限抗压强度（UCS）试验，研究了3种不同纤维（玻璃纤维、聚酯纤维和大麻纤维）对MICP处理后钙质砂物理力学性能的影响。相对于砂的重量，所使用的纤维为0%、0.10%、0.15%、0.20%、0.25%、0.30%、0.35%和0.40%。结果表明，纤维的加入可以提高试件的破坏应变和延性。与生物水泥砂相比，三种纤维增强生物水泥砂的吸水率分别降低了11.60%、21.18%和7.29%。UCS分别提高了24.20%、60.76%和6.40%。涤纶纤维产生的效果最好，其次是玻璃纤维和大麻纤维。玻璃纤维和聚酯纤维的最佳掺量分别为0.20%和0.25%。大麻纤维的最佳含量范围为0.20- 0.25%。发光二极管（LED）显微镜和扫描电子显微镜（SEM）图像得出的结论是，大麻纤维周围仅发生少量方解石沉淀，导致与玻璃纤维和聚酯纤维相比粘合效果较差。因此，建议采用聚酯纤维来改善生物水泥砂的性能。
Microbial-induced calcite precipitation (MICP) has been a promising method to improve geotechnical engineering properties through the precipitation of calcium carbonate (CaCO3) 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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影响因子：
3.7
作者：
Abou Diab, Assile;Najjar, Shadi S.;Alahmad, Mohammad
通讯作者：
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DOI：
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发表时间：
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DOI：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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DOI：
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发表时间：
2006-11-01
影响因子：
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作者：
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