Influence of Fiber Type and Length on Mechanical Properties of MICP-Treated Sand

Xiao, Xueli; Wang, Jie; Wang, Yuxing; Dong, Feng; Zhu, Changsheng

doi:10.3390/ma15114017

Cited by 13 publications

(6 citation statements)

References 33 publications

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“…Tabakouei et al [57] said that the bridging effect of the fibers increases as the fiber length increases. According to Liang et al [58], their study reported that when exposed to an external force, the effect between fibers of different lengths and the soil takes different forms of failure. When the fiber length is short, the failure patterns are characterized by shearing or slipping of the fiber.…”

Section: The Effect Of Fiber Length On Soil Behaviormentioning

confidence: 99%

The Effect of Different Fiber Reinforcement on Bearing Capacity under Strip Foundation on the Sand Soil: An Experimental Investigation

Aksu Alcan,

Çelik

2023

Applied Sciences

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The aim of this study is to investigate the bearing capacity-settlement behavior of strip footing settling on sand soil randomly reinforced with glass fiber, basalt fiber, macromesh fiber, and four different hybrid fiber additives in which these fibers are used together. Model tests were carried out in the laboratory on the strip footing and placed on the unreinforced and reinforced sand with different fibers. In the study, model tests were carried out on seven types of randomly reinforced soils by using glass, basalt, macrame, and mixtures of these fibers as reinforcement. In the model tests, two different fiber contents, 1% and 2%, and two different fiber lengths, 24 mm and 48 mm, were used. Tests were carried out with Dr = 30% and 50% relative density, and reinforcement depths 1B, 2B, and 3B were selected. In addition, the photographs taken during the test were analyzed with the particle image velocimetry (PIV) method and the displacements on the soil were examined. As a result of the reinforced and unreinforced model tests, the highest ultimate bearing capacity was measured as 680 kPa from the tests with Dr = 50% relative density, 48 mm length, 2% contents, and 3B depth macromesh fiber reinforced. In hybrid fibers, the highest ultimate bearing capacity was measured as 495 kPa, with Dr = 50% relative density, 48 mm length, 2% contents, and 2D depth micromesh and basalt fiber-reinforced tests. In the reinforced tests, it was concluded that the most effective fiber on bearing capacity is macromesh fiber. It can be seen that in the PIV analysis, as the fiber additive increased, the settlements made by the foundation decreased under the same pressure. It has also been observed that adding reinforcement to the soil transfers the stresses occurring in the soil to a wider area.

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Section: The Effect Of Fiber Length On Soil Behaviormentioning

confidence: 99%

The Effect of Different Fiber Reinforcement on Bearing Capacity under Strip Foundation on the Sand Soil: An Experimental Investigation

Aksu Alcan,

Çelik

2023

Applied Sciences

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“…Different types of fibers have various surface physical properties, which will lead to different forms of contact between the fiber surface and the soil: a high surface roughness strengthens the interfacial friction between fibers and sand particles (Liang et al, 2022). The fiber content directly affects the three-dimensional mesh structure formed between fibers: additional fiber roots lead to a large contact area between fibers and sand particles, revealing a significant frictional effect in the MICP treated sand.…”

Section: Figurementioning

confidence: 99%

Effect of fiber type and content on mechanical properties of microbial solidified sand

Zhang,

Zheng,

Xiong

et al. 2023

Front. Mater.

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Fibers are applied to construction works to improve the strength and brittle failure of the soil. In this paper, fibers with a length of 6 mm are added to the microbial cemented sand, and fiber types and content are research variable. Unconfined compressive strength (UCS), permeability coefficient, water absorption rate, dry density, and calcium carbonate precipitation of the solidified sand were tested. The physical and mechanical properties of fiber types and content on the immobilization of microorganisms were also analyzed from the micro–macro perspective. Results are presented as follows. The UCS of the Microbial induced calcium carbonate precipitation (MICP) treated sand increases first and then decreases with the increasing fiber content. This phenomenon is due to the promotion of calcium carbonate precipitation by short fiber reinforcement, the limited movement of the sand particles caused by the formed network between the fibers, and the enhanced strength of the microbial solidified sand. However, the agglomeration caused by additional fibers leads to the uneven distribution of calcium carbonate and the reduction in strength. The optimum fiber contents of polypropylene, glass, polyvinyl alcohol, and basalt fibers are 0.4%, 0.2%, 0.2%, and 0.1%, respectively.

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“…(8) e prepared culture medium and Sporosarcina pasteurii were put into a triangular flask and sealed with perforated plastic film, while they were placed in a constant temperature vibration incubator and shaken horizontally at the frequency of 150r • min −1 in order to expand the culture aerobically for 24 hours at 30 °C (see Figure 2(g)). (9) e Sporosarcina pasteurii solution cultured by step ( 8) was adjusted to OD � 1.5 by adding distilled water. In order to ensure that the experiment is carried out in a sterile environment, the above operations should be carried out on a sterile operation platform or on alcohol as much as possible.…”

Section: Bacteria and Culture Mediummentioning

confidence: 99%

“…However, the uniformity of the microbial cement-based material prepared by the preparation process in the same direction is worse than that of the microbial cement-based material prepared by the preparation process in different directions [8]. e results of Liang Shihua et al [9,10] show that for sand with good grain size distribution, the precipitation amount and the uniformity of calcium carbonate are better, and the porosity and permeability coefficient are smaller, which increased the unconfined compressive strength of the sample. Microbial-induced calcite precipitation could effectively improve the shear strength of granite residual soil as well as its internal friction angle and cohesion, Besides, the increase of cohesion was larger than that of the internal friction angle.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Shear Strength of Loess Modified by Microbial Precipitation Technology

Wang

Shi

Dong

et al. 2022

Advances in Materials Science and Engineering

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The shear strength (vertical pressure 50, 100, 200, and 300 kPa) and soil structure of the remolded loess with different proportions of the microbial cementing solution were measured and observed by the direct shear test and scanning electron microscopy (SEM).The results showed: (1) the increase in the microbial cementation solution led to the transformation of the stress-shear displacement curve from strain hardening to strain softening, with the transition interval of 26%∼34%. (2) With the increase in the microbial cementation solution, the change of cohesion showed a trend of “M,” the inflection point of the microbial cementation solution was 14%, 22%, and 34%, while the internal friction angle showed a law of “W,” where the inflection points of the internal friction angle were about 14%, 30%, 34%, and 38%, respectively. In the range of 18%∼30%, the cohesion and internal friction angle increase with an increase in the microbial cementation solution.(3) The change of cohesion is affected by the microbial mineralization saturation and the joint action of the occurrence state of Ca2+ and HCO3- in the microbial cementation solution. The change of internal friction angle is affected by the soil particle contact, the existing form of calcium carbonate formed by microbial precipitation, pore morphology, yield, and other forces. (4) By means of SEM, the distribution morphology of the soil particles and the contact microscopic images of the loess samples modified by microorganisms with different proportions were further verified to further verify the macroscopic changes of the shear strength of the modified loess samples cemented by microorganisms with different proportions. It provides a theoretical basis for the improvement of loess soil structure characteristics by microorganism calcium carbonate precipitation technology.

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Influence of Fiber Type and Length on Mechanical Properties of MICP-Treated Sand

Cited by 13 publications

References 33 publications

The Effect of Different Fiber Reinforcement on Bearing Capacity under Strip Foundation on the Sand Soil: An Experimental Investigation

The Effect of Different Fiber Reinforcement on Bearing Capacity under Strip Foundation on the Sand Soil: An Experimental Investigation

Effect of fiber type and content on mechanical properties of microbial solidified sand

Experimental Study on the Shear Strength of Loess Modified by Microbial Precipitation Technology

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