Effect of Curing on Micro-Physical Performance of Polypropylene Fiber Reinforced and Silica Fume stabilized Expansive Soil Under Freezing Thawing Cycles

Tiwari, Nitin; Satyam, Neelima; Singh, Kundan

doi:10.1038/s41598-020-64658-1

Cited by 61 publications

(17 citation statements)

References 85 publications

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“…The swelling pressure, expansion percentage, and time rate of swell decrease, whereas the unconfined compressive strength (UCS) increases with the addition of expanded polystyrene (EPS) to soils [22]. Silica fume (SF) and polypropylene (PP) have been shown to be effective at reinforcing soils and show promise in environmentally friendly road work applications [23]. Almajed et al [24] investigated the optimal levels of reinforcement fiber length (FL), fiber dosage (FD), and curing time (CT) for geotechnical parameters of stabilized soil and pointed optimal values of these indicators.…”

Section: Introductionmentioning

confidence: 99%

Study of the Mechanical and Microscopic Properties of Modified Silty Clay under Freeze-Thaw Cycles

et al. 2022

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Silty clay can be found in the alpine region of the Qinghai province, China, where it is subject to annual freeze-thaw cycles. To investigate the static mechanical properties of silty clay modified by basalt fiber and basalt powder under the action of freeze-thaw cycles, triaxial compression tests and scanning electron microscope tests were conducted on the soil. The test results revealed that varying the number of freeze-thaw cycles resulted to different effects on the soil mechanical strength, which tended to increase after 2 cycles, but then tended to decline when subjected to 5–10 cycles. After 20 freeze-thaw cycles, soil strength reached a dynamic equilibrium state. The shear strength of basalt fiber soil and basalt powder soil increased by 7.55% and 5.12%, respectively, compared with that of normal soil under 30 freeze-thaw cycles. Subsequently increasing of the number of freeze-thaw cycles differentially affected the cohesion and internal friction angle of normal soil and admixture soils, and these soils gradually tended to stabilize at a mechanical strength higher than the initial value. Basalt fibers reinforced the soil to a higher degree than basalt powder at a dosage of 0.4% based on dry soil mass. The stress-strain curves of the three soil types can be simulated using the hyperbolic model. The results of the study can provide some theoretical reference for practical engineering in seasonal frozen soil areas.

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Section: Introductionmentioning

confidence: 99%

Study of the Mechanical and Microscopic Properties of Modified Silty Clay under Freeze-Thaw Cycles

et al. 2022

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“…In recent years, the MICP method has gained popularity for its potential to reinforce soil particles [5][6][7] in comparison with other ground-improvement practices, which use industrial waste, ashes, agricultural waste, and fibers [8][9][10][11][12]. It is one of the environmentally friendly methods for soil improvement [13].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Optimization of Cementation Solution for Wind-Erosion Resistance Using the MICP Method

2022

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In the present study, an environmentally friendly microbial-induced calcium carbonate precipitation (MICP) technique was explored to reinforce the desert sand using the stopped-flow pouring method. A detailed experimental study has been conducted with Sporosarcina (S.) pasteurii urease-producing bacteria with a 0.5 M cementation solution. To optimize the cementation solution, three different pore volumes (PV), i.e., 0.4, 0.6, and 0.8, were considered. The cementation solution was provided every 24 h and considered as one treatment cycle. The cylindrical specimen in three replicas was biotreated for 7, 14, and 21 days in 1:1 and 1:2 (diameter: height) ratios for determina-tion of split-tensile strength (STS) and unconfined compressive strength (UCS), respectively. Micro-structure characterization of untreated and biotreated sand was also examined using a scanning electron microscope (SEM) and energy-dispersive X-ray analysis (EDX). Rocklike behavior was ob-served for biotreated-sand samples using the UPV test. Test results for 21 days with 0.8 PV were 1340 kPa, 241 kPa, and 1762 m/s for UCS, STS, and UPV, respectively, with an average calcite content of 16.2%. Overall, the 0.5 M cementation solution with a 24 h treatment cycle, 0.8 PV with 7 days, and 0.4 PV with 14 days gave optimum treatment solution, and showed heavily cemented and rock-type behavior of the biotreated-sand sample.

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“…The polypropylene fiber made up of waste plastic has been effectively used as reinforcement 47 – 51 . Tiwari et al 52 investigated the effect of polypropylene fibers on the reinforcement of the expansive subgrades stabilized with silica fume and found a significant improvement in the engineering properties under freeze-thaw cycles. Deng et al 53 studied the effect of polypropylene fiber to reinforced the expansive subgrades and found that the strength has been increased with the increase of fiber length at optimum moisture content.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on strength improvement of expansive subgrades by polypropylene fibers and geogrid reinforcement

Tiwari

Satyam

2022

Sci Rep

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The rapid development of infrastructure often encounters the loose subgrades and is becoming difficult to carry to construction activities. Numerous counteracting methods are developed to control the swelling-shrinkage behavior of the expansive subgrades. The mechanical stabilization of the expansive subgrades by reinforcing with the polypropylene fiber and geogrid is sustainable. Geogrids and polypropylene fibers have been used extensively to strengthen the expansive subgrade and foundations as individuals. The polypropylene fiber reinforcement enhanced the reinforced expansive subgrades's tensile strength capacity, wherein the geogrid reinforcement is the quick fix mechanical stabilization technique, which reduces the pavement failures. In this research, the polypropylene fiber and geogrid reinforcement’s combined effect has been evaluated to stabilize the pavement subgrades. The various mechanical strength test such as unconfined compressive strength (UCS) and large direct shear box test was conducted to evaluate the mechanical interaction between expansive subgrades, polypropylene fiber, triaxial geogrid, and biaxial geogrid at the interface. The polypropylene fiber of 12 mm length was used in the proportion of 0.25%, 0.5%, and 1.0% and single geogrid layer at mid-depth. The result shows that reinforced subgrades’ shear strength with a layer of biaxial/ triaxial geogrid and polypropylene fiber increases by 177%. It is also observed that the unconfined compressive strength of the expansive subgrades increased ranging 3.8–139.6% with the inclusion of polypropylene fiber with geogrid in different combinations. The combined reinforcement method shows an effective treatment methodology to improve the property of expansive subgrades.

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Effect of Curing on Micro-Physical Performance of Polypropylene Fiber Reinforced and Silica Fume stabilized Expansive Soil Under Freezing Thawing Cycles

Cited by 61 publications

References 85 publications

Study of the Mechanical and Microscopic Properties of Modified Silty Clay under Freeze-Thaw Cycles

Study of the Mechanical and Microscopic Properties of Modified Silty Clay under Freeze-Thaw Cycles

Experimental Study on Optimization of Cementation Solution for Wind-Erosion Resistance Using the MICP Method

An experimental study on strength improvement of expansive subgrades by polypropylene fibers and geogrid reinforcement

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