Combined effect of nano-silica and randomly distributed fibers on the strength behavior of clay soil

Kulanthaivel, P.; Selvakumar, S.; Soundara, B.; Kayalvizhi, V.; Bhuvaneshwari, S.

doi:10.1007/s41204-021-00176-3

Cited by 16 publications

(5 citation statements)

References 28 publications

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“…It can be seen that adding NM from 0% to 4% led to an increase in w opt from 19.8% to 23.9%, yet a decrease in ρ dmax from 1.64 g/cm 3 to 1.57 g/cm 3 . Similar observations were also reported in previous works on soils treated with fine-grained stabilizer [31,48]. The increase in w opt was probably due to the excellent water-absorption capacity of NM [49,50], and the change-down in ρ dmax could be attributed to the following reasons: (1) NM particles having thicker bound-water films and lower specific gravity compared with that of soil particles; (2) the increased interparticle bonding force by adding NM, which prevented easy compaction.…”

Section: Compactabilitysupporting

confidence: 92%

Geotechnical Properties and Stabilization Mechanism of Nano-MgO Stabilized Loess

Chen

Sun³

et al. 2023

Sustainability

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This study focused on the utilization of nano-MgO as an energy-saving and eco-friendly stabilizer to improve the engineering performance of loess. To this end, loess samples at various nano-MgO contents and curing times were prepared, and then standard compaction, consistency limits, and unconfined compression tests were performed. The achieved results demonstrated that adding nano-MgO increased the liquid limit, plastic limit, and optimum water content of loess, while it decreased the plastic index and maximum dry density. The unconfined compressive strength (UCS) presented an increasing trend with curing time and a “rise-fall” trend with the addition of nano-MgO. At the optimum nano-MgO content of 2%, about 72% UCS gain was to be expected with 28 days of curing. The variation of the deformation modulus was similar to that of UCS, and the strain at failure presented an opposite trend. Empirical models for these properties were formulated and validated by literature data. Finally, from NMR analyses, the improving mechanism was found to be nano-MgO induced water transformation from free water to bound water.

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Section: Compactabilitysupporting

confidence: 92%

Geotechnical Properties and Stabilization Mechanism of Nano-MgO Stabilized Loess

Chen

Sun³

et al. 2023

Sustainability

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“…The size of the particles can get altered under different laboratory conditions e.g., time, mixing method and additive type etc. [18][19][20] .…”

Section: Structural Propertiesmentioning

confidence: 99%

Application of Nanotechnology in Soil Stabilization

Kumar,

Devi

2023

Jour. of build. mater. Sci.

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Nano-technology is expanding its horizon in various science and technology fields. In civil engineering, soil is a complex material and used for various functions and applications. Meanwhile, sometimes an effective soil stabilization technique is needed to fulfil the site criteria and can be achieved by adopting various methods e.g., physical, chemical, thermal or reinforcement using geotextiles and fabrics. The mechanism of soil stabilization using nanomaterials is still unexplored and open to prospective researchers. The present article attempts to touch and explore the possibilities of nano-technology in soil improvement and its applications in various civil engineering works. Microstructural analysis of the nanomaterials treated soils using the latest equipment has also been discussed. The study interprets that the use of nano materials is still limited, due to their high cost and sophisticated handling procedures. Though the use of nanoparticles in soil stabilization results in extraordinary improvements in various soil properties, the improved soil properties could be utilized for various geotechnical projects. The present study bridges the past findings to the present scenario of nanomaterials in soil improvement.

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“…From examining the literature, it can be observed that most experimental studies on the topic of fiber reinforced soils have been conducted on granular or low plasticity, fine-grained soils [14][15][16][17]. However, the fiber-sand contact mechanism differs greatly from the respective fiber-clay mechanism.…”

Section: Research Significancementioning

confidence: 99%

Improving Very High Plastic Clays with the Combined Effect of Sand, Lime, and Polypropylene Fibers

2022

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Improving the mechanical properties of low-strength soils (e.g., high plasticity clays) is one of the main branches of geotechnical engineering. The adoption of stabilization techniques for ensuring that structures will be founded on an adequately strong soil base is a common practice. Stabilization techniques for clay soils may include inert materials (cohesionless soils), chemical substances (cement, lime, or industrial additives), or the use of randomly distributed fibers. While all of these additives are added to low-strength soils by mixing, the question remains whether an optimal combination of stabilization techniques can be achieved for maximizing soil strength. Besides, each one of these additives contributes to an increase in soil strength in a different manner (soil replacement, chemical bonding of soil particles, and soil reinforcement respectively), while, according to the literature, each technique has its limitations. The latter refers to a limited effect on strength improvement and a maximum possible percentage, beyond which an additive has an adverse effect on strength; it also refers to other factors, such as brittleness failure, material availability, overall cost, and environment-related issues. Hence, in the present study, the efficiency of improving the basic geotechnical properties of a very high plasticity clay (liquid limit ωl = 86%) with a coupled effect between dune sand, lime, and polypropylene (PP) fibers has been investigated. The samples prepared by combining the three aforementioned soil improvement techniques were compared in terms of plasticity, compaction characteristics, unconfined compressive strength (UCS), and California Bearing Ratio (CBR) index. The experimental results show that the combination of these additives may lead to a considerable improvement in the strength and ductility of soils, even with a small amount of lime additive. Also, it was observed that 20% of sand, 3.4% of lime and 0.9% of fibers (by wt%) offers the best performance in terms of strength improvement for the clay tested (i.e., 12.75 times improvement compared to the untreated clay).

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Combined effect of nano-silica and randomly distributed fibers on the strength behavior of clay soil

Cited by 16 publications

References 28 publications

Geotechnical Properties and Stabilization Mechanism of Nano-MgO Stabilized Loess

Geotechnical Properties and Stabilization Mechanism of Nano-MgO Stabilized Loess

Application of Nanotechnology in Soil Stabilization

Improving Very High Plastic Clays with the Combined Effect of Sand, Lime, and Polypropylene Fibers

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