Properties of biocemented, fiber reinforced sand

Choi, Sun-Gyu; Wang, Kejin; Chu, Jian

doi:10.1016/j.conbuildmat.2016.05.124

Cited by 147 publications

(78 citation statements)

References 14 publications

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“…This addition showed that suitable engineering properties were obtained with fiber additions of up to 0.3% fiber content by weight of sand. Choi et al [18] also reported similar MICP enhancements using polyvinyl alcohol (PVA) fiber. Their work revealed that the addition of PVA fiber increased the UCS and tensile strength of the MICP-treated sand by 30% and 160%, respectively.…”

Section: Introductionmentioning

confidence: 76%

“…As the fiber content increased, the average hydraulic conductivity decreased slightly due to the reduction in the void volume caused by the fiber and calcite within the sand particles. However, the effect of fiber inclusion on permeability appears to be minor compared to the precipitation of calcite [18].…”

Section: Effect Of Fiber Inclusionmentioning

confidence: 93%

“…They have a pre-cut form with a typical diameter and length of 0.1 and 12 mm, respectively. The same type of PVA fibers are known to provide similar engineering benefits when applied in cement and in cemented sand processing [20] as well as with MICP-biocemented sands [18]. Table 1 shows the physical properties for this form of pre-cut PVA fiber.…”

Section: Sand and Fibermentioning

confidence: 99%

“…In the case with fiber, the Ottawa sand was first placed in a Hobart mixer where it could be mixed homogenously with the PVA fiber. By weight, 0%, 0.2%, 0.4%, and 0.6% PVA fiber was used [18]. To treat the sample, 100 mL of the UPB solution was pumped onto the top of the sample column.…”

Section: Sample Preparation and Treatmentmentioning

confidence: 99%

“…In this study, the optimum fiber content was approximately 0.4%. Choi et al [18] discovered that the UCS rapidly increased as the PVA fiber content increased up to 0.8% when the CC was high. Li et al [17] showed that the shear strength of MICP treated sand with polypropylene fiber increased up to a ratio of 0.3%.…”

Section: Effect Of Fiber Inclusionmentioning

confidence: 99%

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Undrained Behavior of Microbially Induced Calcite Precipitated Sand with Polyvinyl Alcohol Fiber

2019

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Microbially induced calcite precipitation can cement sand and is an environment-friendly alternative to ordinary Portland cement. In this study, clean Ottawa sand was microbially treated to induce calcite contents (CCs) of 0%, 2%, and 4%. Polyvinyl alcohol fiber was also mixed with the sand at four different contents (0%, 0.2%, 0.4%, and 0.6%) with a constant CC of 4%. A series of undrained triaxial tests was conducted on the treated sands to evaluate the effects of the calcite treatment and fiber inclusion. Their hydraulic conductivity was also determined using a constant head test. As the CC increased from 0% to 4%, the friction angle and cohesion increased from 35.3° to 39.6° and from 0 to 93 kPa, respectively. For specimens with a CC of 4%, as the fiber content increased from 0% to 0.6%, the friction angle and cohesion increased from 39.6° to 42.8° and from 93 to 139 kPa, respectively. The hydraulic conductivity of clean Ottawa sand decreased by a factor of more than 100 as the CC increased from 0% to 4%. The fiber inclusion had less effect on the hydraulic conductivity of the specimen with 4% CC.

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Section: Introductionmentioning

confidence: 76%

Section: Effect Of Fiber Inclusionmentioning

confidence: 93%

Section: Sand and Fibermentioning

confidence: 99%

Section: Sample Preparation and Treatmentmentioning

confidence: 99%

Section: Effect Of Fiber Inclusionmentioning

confidence: 99%

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Undrained Behavior of Microbially Induced Calcite Precipitated Sand with Polyvinyl Alcohol Fiber

2019

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SANISAND‐C*: Simple ANIsotropic constitutive model for SAND with Cementation

Landivar Macias,

Rotta Loria

2023

Num Anal Meth Geomechanics

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Cemented sands exhibit superior mechanical properties compared to clean sands. Based on this evidence, ground improvement methods are increasingly employed to induce cementing reactions that can bind the solid particles of sands and other soils for the ultimate enhancement of their properties and behavior. Despite increasing ground improvement applications, constitutive models capable of capturing cementation effects on the mechanics of sands remain scarce. This article presents SANISAND‐C*: a constitutive model developed in the framework of bounding surface and critical state plasticity to capture cementation effects on the mechanics of sands. In this paper, the mathematical formulation of this model is presented first. Then, a vast amount of experimental data available for different materials (i.e., types of sand), loading conditions (i.e., stress levels and paths), and cementation types (i.e., natural and artificial cementations) is used to validate the model. Based on the comparison between experimental and simulation results, this work finally discusses the capabilities and limitations of the proposed model, highlighting that it can realistically capture key properties of cemented sands: increased strength and stiffness, increased dilatancy, and bond destructuration upon loading.

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