Unconfined Compressive and Splitting Tensile Strength of Basalt Fiber–Reinforced Biocemented Sand

Xiao, Yang; He, Xiang; Evans, T. Matthew; Stuedlein, Armin W.; Liu, Hanlong

doi:10.1061/(asce)gt.1943-5606.0002108

Cited by 167 publications

(64 citation statements)

References 55 publications

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“…The chemical stabilization of cohesionless soil using a grouting technique is the most common method used for liquefaction mitigation of the ground below existing buildings. Varieties of chemical stabilization are undertaken rapidly, including cement, lime, epoxy or silicates, fly ash, calcite precipitation, and mixtures thereof [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. One method increasingly taken into consideration is the usage of waste materials, such as fly ash, as a binder.…”

Section: Introductionmentioning

confidence: 99%

The Mechanical Properties of Fly-Ash-Stabilized Sands

et al. 2020

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The stabilization of soil through the addition of fly ash has been shown to be an effective alternative for improving the strength and stiffness of soil through the resulting chemical reactions. The chemical reaction that occurs dissociates the lime (CaO) in the fly ash, and the establishment of cementitious and pozzolanic gels (consisting of calcium silicate hydrate (CSH) gel and calcium aluminate hydrate (CAH) gel) binds the soil particles and increases the strength and stiffness of the soil. Investigations into the mechanical properties of sands stabilized with fly ash (fly-ash-stabilized sands) were conducted through a series of unconfined compressive strength (UCS) and direct shear strength tests for various fly ash percentages, curing times, grain sizes, degrees of saturation during sample preparation, and content of fines. It was found that the mechanical properties—UCS and direct shear strength (DSS)—of fly-ash-stabilized sands increased with both increasing fly ash content in the specimen and curing time, but decreased with increasing grain size, degree of saturation during sample preparation, and content of fines. The results indicated that fly-ash-stabilized sands required more than a month to attain their optimum performance with regard to binding sand particles.

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Section: Introductionmentioning

confidence: 99%

The Mechanical Properties of Fly-Ash-Stabilized Sands

et al. 2020

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“…Microbially induced calcium carbonate precipitation (MICP) is a biologically induced cementation process that can be used to improve the geotechnical engineering properties of a granular soil through the precipitation of calcium carbonate (CaCO 3 ) crystals at soil particle contacts and soil particle surfaces (Stocks-Fischer et al 1999;Martinez and DeJong 2009;Gomez et al 2018;Zamani and Montoya 2018;Liu et al 2018;Xiao et al 2019aXiao et al , 2019b. Although the application of the MICP method has been limited to controlled experiments to date, it represents a promising ap-proach to efficiently increase soil strength and stiffness, and reduce soil permeability, as demonstrated in laboratory experiments, large scale model tests, and field tests.…”

Section: Introductionmentioning

confidence: 99%

Effect of relative density and biocementation on cyclic response of calcareous sand

et al. 2019

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Microbial-induced calcium carbonate precipitation (MICP) represents a promising approach to improve the geotechnical engineering properties of soils through the precipitation of calcium carbonate (CaCO3) at soil particle contacts and soil particle surfaces. An extensive experimental study was undertaken to investigate the influence of initial relative density on the efficiency of the biocementation process, the reduction of liquefaction susceptibility, and the cyclic response in biocemented calcareous soils. For this purpose, stress-controlled undrained cyclic triaxial shear (CTS) tests were carried out on untreated and MICP-treated calcareous sand specimens for different initial relative densities and magnitudes of biocementation. Improvement in the cyclic response was quantified and compared in terms of excess pore pressure generation, evolution of axial strains, and the number of cycles to liquefaction. The cyclic experiments show that MICP treatment can change the liquefaction failure mechanism from flow failure to cyclic mobility and can significantly change the excess pore pressure generation response of initially loose specimens. Scanning electron microscope (SEM) images indicate the CaCO3 crystals alter the characteristics of the sand particles and confirm the physical change in soil fabric that impacts the dynamic behavior and liquefaction resistance of MICP-treated specimens. Furthermore, the effect of biocementation was contrasted against the effect of relative density alone, and MICP treatment was shown to exhibit greater efficiency in improving the cyclic resistance than densification.

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“…e calcium carbonate content was defined as the mass of the produced calcite divided by that of the untreated specimen. e mass of the produced calcite for the silica and calcareous sands was measured using an acid washing technique and weighing method, respectively [21]. Figure 8 shows the average content of CaCO 3 for the sample with different fiber contents.…”

Section: Calcium Carbonate Content and Permeability Coefficientmentioning

confidence: 99%

“…Paassen et al [18] demonstrated that this technique can enhance the bearing capacity and stiffness of soils in large-scale in situ tests. Park et al [19], Li et al [20], and Xiao et al [21] investigated the effect of polyvinyl alcohol (PVA) fiber, polypropylene (PP) fiber, and basalt fiber on the strength of microbial solidified sand.…”

Section: Introductionmentioning

confidence: 99%

Strength and Micromechanism Analysis of Microbial Solidified Sand with Carbon Fiber

Qiu

Tong

et al. 2020

Advances in Civil Engineering

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Microbially induced calcite precipitation (MICP) is an effective and ecofriendly technology that utilizes the microbes-induced mineralization to improve foundation soils of the transportation infrastructure. The carbon fiber can be used along with the MICP in order to reduce the brittleness of microbial solidified soil. This paper investigated the strength of carbon fiber-reinforced sand with different mass fractions through a series of unconfined compression tests. The effect of fiber content on the solidification of carbon fiber-reinforced sand was quantitatively analyzed using calcium carbonate content test and penetration test. The microsolidification mechanism was investigated by micrographs from the optical and scanning electron microscope (SEM). The test results showed that unconfined compressive strength generally increased first and then decreased with the increase of the fiber content. The optimal fiber content in the silica and calcareous sand was 0.2% and 0.1%, respectively. The bulging deformation of the fiber-reinforced sand sample was gradually developed along with the fiber breakage during loading.

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Unconfined Compressive and Splitting Tensile Strength of Basalt Fiber–Reinforced Biocemented Sand

Cited by 167 publications

References 55 publications

The Mechanical Properties of Fly-Ash-Stabilized Sands

The Mechanical Properties of Fly-Ash-Stabilized Sands

Effect of relative density and biocementation on cyclic response of calcareous sand

Strength and Micromechanism Analysis of Microbial Solidified Sand with Carbon Fiber

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