Feasibility of saline soil reinforced with treated wheat straw and lime

Min, Li; Chai, Shou Xi; Zhang, Huyuan; Du, Hong Pu; Li, Wei

doi:10.1016/j.sandf.2012.02.003

Cited by 53 publications

(16 citation statements)

References 11 publications

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“…e pretreatment process of wheat straw is shown in Figure 1. e wheat straw fibers were dried at the temperature of 65°C [29]. After drying, they were cleaned and the leaves, spikes, sheaths, and fragments were removed.…”

Section: Methodsmentioning

confidence: 99%

Strength and Deformation Properties of Fiber and Cement Reinforced Heavy Metal-Contaminated Synthetic Soils

Tang

Shi

Zhang

et al. 2019

Advances in Materials Science and Engineering

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Heavy metals are not only hazardous to environment and public health, but they degrade the physicochemical and biological properties of soils increasing difficulty to the redevelopment of contaminated sites. This study proposes a method for reinforcing contaminated soils with fiber and cement. The feasibility of using wheat straw as fiber reinforcement is discussed. The strength of heavy metal-contaminated soil reinforced with wheat straw and cement is investigated through laboratory testing. Twelve groups of soil samples were prepared at three fiber contents (i.e., 0.1%, 0.2%, and 0.3% by weight), three water contents (i.e., 9%, 12%, and 15%), and three cement contents (i.e., 5%, 7.5%, and 10% by weight). Unconfined compression strength (UCS) was tested after 28 days of curing period and various freeze-thaw cycles. The testing results show that the increase in the number of freeze-thaw cycles results in the decrease of UCS. The inclusion of fiber reinforcement within cemented soil causes an increase in the UCS and changes the brittle behavior of cemented soil to a more ductile one. The UCS of the fiber-reinforced soils first increases, then decreases with the increase of water content, and reaches the maximum value at the optimum moisture content.

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Section: Methodsmentioning

confidence: 99%

Strength and Deformation Properties of Fiber and Cement Reinforced Heavy Metal-Contaminated Synthetic Soils

Tang

Shi

Zhang

et al. 2019

Advances in Materials Science and Engineering

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“…The wheat straw fibers used in this study are presented in Figure 1. They were considered natural because they were not treated with any chemical additive such as the SH agent used by Li et al (2012) [58]. The natural characteristics of wheat straw fibers were retained to achieve the objective of investigating how the coupling effect of wheat straw fiber reinforcement and lime stabilization was affected by the intact honeycomb pattern of wheat straw fibers.…”

Section: Wheat Straw Fibersmentioning

confidence: 99%

“…After having been dried in the sun, the wheat straw fibers were peeled and cut into slices with a complete cross section of one-quarter of the original and a length of 13 mm. This cross section and length of the wheat straw fiber slices were selected because they were optimal for mobilizing the reinforcing effect [58]. The physical and mechanical properties of the wheat straw fibers provided by the manufacturer are summarized in Table 2.…”

Section: Wheat Straw Fibersmentioning

confidence: 99%

Behavior of Fiber-Reinforced and Lime-Stabilized Clayey Soil in Triaxial Tests

Wang

Guo

et al. 2019

Applied Sciences

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The beneficial role of combining fiber reinforcement with lime stabilization in altering soil behavior has been established in the literature. However, the coupling effect of their combination still remains unclear in terms of its magnitude and microscopic mechanism, especially for natural fibers with special microstructures. The objective of this study was to investigate the coupling effect of wheat straw fiber reinforcement and lime stabilization on the mechanical behavior of Hefei clayey soil. To achieve this, an experimental program including unconsolidated–undrained (UU) triaxial tests and SEM analysis was implemented. Static compaction test samples were prepared on untreated soil, fiber-reinforced soil, lime-stabilized soil, and lime-stabilized/fiber-reinforced soil at optimum moisture content with determining of the maximum dry density of the untreated soil. The lime was added in three different contents of 2%, 4%, and 6%, and 13 mm long wheat straw fiber slices with a cross section one-quarter that of the intact ones were mixed in at 0.2%, 0.4%, and 0.6% by dry weight of soil. Analysis of the derived results indicated that the addition of a small amount of wheat straw fibers into lime-stabilized soil improved the intensity of the strain-softening behavior associated with mere lime stabilization. The observed evidence that the shear strength increase brought by a combination of 0.4% fiber reinforcement and 4% lime stabilization was smaller than the summation of the shear strength increases brought by their presence alone in a sample demonstrated a coupling effect between fiber reinforcement and lime stabilization. This coupling effect was also detected in the comparisons of the secant modulus and failure pattern between the combined treatment and the individual treatments. These manifestations of the coupling effect were explained by a microscopic mechanism wherein the fiber reinforcing effect was made more effective by the ways in which lime chemically stabilized the soil and lime stabilization development was quickened by the water channels passing through the surfaces and honeycomb pores of the wheat straw fibers.

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“…is fiber faces corrosion issues, which was mentioned in the literature review above [19,23]. In the current work, modified polyvinyl alcohol (SH glue) was selected to address the corrosion problem [24]. Plant fibers were soaked for 3 days in modified polyvinyl alcohol solution, and then they were removed from the solution to dry naturally [24].…”

Section: Orthogonal Test: Materials Methodology and Specimen Preparmentioning

confidence: 99%

“…In the current work, modified polyvinyl alcohol (SH glue) was selected to address the corrosion problem [24]. Plant fibers were soaked for 3 days in modified polyvinyl alcohol solution, and then they were removed from the solution to dry naturally [24]. e surface topographies of the plant fibers before and after antiseptic treatment are shown in Figure 1.…”

Section: Orthogonal Test: Materials Methodology and Specimen Preparmentioning

confidence: 99%

A New Heat Insulation Shotcrete Mixed with Basalt and Plant Fibers

Huang

Pang

Liu

et al. 2019

Advances in Civil Engineering

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An orthogonal set of experiments was performed on common shotcrete, where the coarse and fine aggregates were substituted with ceramsite and pottery sand, while basalt and plant fibers were also added. The influence of ceramsite, pottery sand, basalt fiber, and plant fiber on the mechanical properties and thermal conductivity of shotcrete was investigated, and the relevant mechanisms were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the admixtures formed a stable state in the concrete matrix when the coarse and fine aggregates were substituted by 5 mass% of ceramsite and 10 mass% of pottery sand, respectively, and with 0.15 and 0.2 vol.% basalt fiber and plant fiber, respectively. At this point, the cement hydration was normal, and the strength of the concrete was relatively higher than other groups. The ceramsite and pottery sand formed a uniformly distributed porous structure in the concrete matrix, thereby reducing the thermal conductivity of the concrete.

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Feasibility of saline soil reinforced with treated wheat straw and lime

Cited by 53 publications

References 11 publications

Strength and Deformation Properties of Fiber and Cement Reinforced Heavy Metal-Contaminated Synthetic Soils

Strength and Deformation Properties of Fiber and Cement Reinforced Heavy Metal-Contaminated Synthetic Soils

Behavior of Fiber-Reinforced and Lime-Stabilized Clayey Soil in Triaxial Tests

A New Heat Insulation Shotcrete Mixed with Basalt and Plant Fibers

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