The Influence of the Addition of Plant-Based Natural Fibers (Jute) on Biocemented Sand Using MICP Method

Imran, Al; Gowthaman, Sivakumar; Nakashima, Kazunori; Kawasaki, Satoru

doi:10.3390/ma13184198

Cited by 49 publications

(22 citation statements)

References 34 publications

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“…Although these fibers have several merits, their disadvantages include the high cost and environmental impact. In consideration of the impact on the environment and cost-effectiveness of the fibers mentioned above, some researchers investigated the utilization of natural fibers in MICP, such as plant fibers [ 31 ], animal fibers [ 32 ], and mineral fibers [ 33 ]. Plant fibers are usually preferred for their low cost.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Sand Stabilization Using Bio-Cementation with Wastepaper Fiber Integration

et al. 2021

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Recently, green materials and technologies have received considerable attention in geotechnical engineering. One of such techniques is microbially-induced carbonate precipitation (MICP). In the MICP process, CaCO3 is achieved bio-chemically within the soil, thus enhancing the strength and stiffness. The purpose of this study is to introduce the wastepaper fiber (WPF) onto the MICP (i) to study the mechanical properties of MICP-treated sand with varying WPF content (0–8%) and (ii) to assess the freeze–thaw (FT) durability of the treated samples. Findings revealed that the ductility of the treated samples increases with the increase in WPF addition, while the highest UCS is found with a small fiber addition. The results of CaCO3 content suggest that the WPF addition enhances the immobilization of the bacteria cells, thus yielding the precipitation content. However, shear wave velocity analysis indicates that a higher addition of WPF results in rapid deterioration of the samples when subjected to freeze–thaw cycles. Microscale analysis illuminates that fiber clusters replace the solid bonding at particle contacts, leading to reduced resistance to freeze–thaw damage. Overall, the study demonstrates that as a waste material, WPF could be sustainably reused in the bio-cementation.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Sand Stabilization Using Bio-Cementation with Wastepaper Fiber Integration

et al. 2021

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“…According to Figure 9 a, the addition of fiber filled the gaps between sand particles and made the sand denser. The decrease of sand porosity is considered the main factor for the decrease of brittleness of fiber-reinforced EICP-treated sand [ 35 , 36 , 37 ]. By absorbing a large amount of CaCO 3 crystals, the fiber weakens the characteristic of equal thickness distribution of CaCO 3 on the surface of sand particles [ 38 ], forming a system of “fiber–CaCO 3 –sand particles” [ 39 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

et al. 2021

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Enzyme-induced calcium carbonate precipitation (EICP) technology can improve the strength of treated soil. But it also leads to remarkable brittleness of the soil. This study used polyvinyl alcohol (PVA) fiber combined with EICP to solidify sand. Through the unconfined compressive strength (UCS) test, the effect of PVA fiber incorporation on the mechanical properties of EICP-solidified sand was investigated; the distribution of CaCO3 in the sample and the microstructure of fiber-reinforced EICP-treated sand were explored through the calcium carbonate content (CCC) test and microscopic experiment. Compared with the sand treated by EICP, the strength and stiffness of the sand reinforced by the fiber combined with EICP were greatly improved, and the ductility was also improved to a certain extent. However, the increase of CCC was extremely weak, and the inhomogeneity of CaCO3 distribution was enlarged; the influence of fiber length on the UCS and CCC of the treated sand was greater than that of the fiber content. The improvement of EICP-solidified sand by PVA fiber was mainly due to the formation of a “fiber–CaCO3–sand” spatial structure system through fiber bridging, not the increase of CCC.

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“…MICP is to convert Ca 2+ into CaCO 3 precipitation. After filtration and drying of group A∼F, the concentration of the calcium ion was measured by the EDTA standard solution titration method [44], and the actual amount of CaCO 3 precipitation can be measured. 6…”

Section: Optimal Ratio Of Calcium To Bacteria For Micpmentioning

confidence: 99%

Effect of Glutinous Rice Slurry on the Reinforcement of Silt in the Yellow River Basin by Microbially Induced Carbonate Precipitation (MICP): Mechanical Property and Microcosmic Structure

Yue

Zhao

Zhang

et al. 2021

Advances in Materials Science and Engineering

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The silty clay in the lower reaches of the Yellow River is characterized by loose structure, low strength, and strong capillary effect. Based on the technology of ancient glutinous rice mortar and microbial-induced calcium carbonate precipitation (MICP), experiments on optimal mass ratio of cementitious liquid to bacterial liquid and optimal concentration of cementitious liquid for MICP and improved MICP technology were carried out by measuring the production of CaCO3, and direct shear test and unconfined compressive strength test of plain silt, glutinous mixing silt, and improved silt with MICP and modified MICP were conducted. The microstructure of the reaction products of MICP and improved MICP technology were also evaluated based on scanning electron microscopy (SEM). Research results showed that the mechanical properties of silt with glutinous rice slurry were effectively improved. With the increase in the concentration of glutinous rice slurry, the strength and internal friction angle of soil samples first increased and then decreased, and the cohesion presented a linear increasing trend. When the concentration of cementitious liquid was 0.5 M and the mass ratio of cementitious liquid to bacterial liquid was 2 : 1, the amount of CaCO3 formed was the most, and the conversion rate of Ca2+ was more than 80%. The improved MICP could increase the conversion rate of Ca2+ (93.44%). An improved MICP showed that glutinous rice slurry could improve bacterial activity, increase the urease content in the bacterial solution, and promote the production of CaCO3. Silt cohesion and internal friction angle of the silt were improved by the improved MICP technology, and the strengthening effect of mechanical properties of modified MICP-reinforced soil is better than that of the MICP-reinforced soil; conventional MICP technology could also improve the soil cohesion, but the improvement in the internal friction angle was not obvious. The SEM results indicated that compared with the reaction product of MICP technology, the structure of the product of improved MICP technology is more compact, resulting in a marked reinforcement of MICP performance with glutinous rice slurry. This study provides new insights into enhancing the mechanical behaviour of MICP-treated silt in the Yellow River Basin with glutinous rice slurry.

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The Influence of the Addition of Plant-Based Natural Fibers (Jute) on Biocemented Sand Using MICP Method

Cited by 49 publications

References 34 publications

Experimental Study on Sand Stabilization Using Bio-Cementation with Wastepaper Fiber Integration

Experimental Study on Sand Stabilization Using Bio-Cementation with Wastepaper Fiber Integration

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

Effect of Glutinous Rice Slurry on the Reinforcement of Silt in the Yellow River Basin by Microbially Induced Carbonate Precipitation (MICP): Mechanical Property and Microcosmic Structure

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