Experimental Study of Nanometer Magnesium Oxide-Modified Clay

Gao, Lei; Ren, Zhimin; Yu, Xiaohui

doi:10.1007/s11204-015-9331-y

Cited by 27 publications

(13 citation statements)

References 28 publications

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“…Nanomaterials are a kind of ultra-fine material with a large specific surface area and a 1-100 nm particle size. They have some special structural characteristics, with four major effects: the size effect, quantum effect, surface effect, and interface effect [17]. With the wide application of nanomaterials, their cost has sharply decreased, providing the possibility for large-scale application of nanomaterials in geotechnical engineering.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Consolidation Properties of Nano-Bentonite Mixed Clayey Soil

et al. 2020

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As a new soil improvement method, adding nano-bentonite can enhance the engineering properties of soil. To study the stabilization effect of nano-bentonite on soil consolidation properties, a series of one-dimensional odometer tests were conducted on a clayey soil with different nano-bentonite mixing contents (i.e., 0.5%, 1%, 1.5%, and 2%). The effects of nano-bentonite on the coefficient of consolidation and permeability of the test soil were analyzed. The results show that adding a certain amount of nano-bentonite does not significantly affect the original consolidation characteristics of soil samples, but displays a notable effect on accelerating water drainage. Among all the soil samples, when the nano-bentonite mixing content is 0.5%, the final compression amount is the largest and the final void ratio is the smallest. The coefficients of consolidation and permeability increase with increasing nano-bentonite mixing content under high stress state. The test results indicate that nano-bentonite can facilitate internal cementation of soil particles, which effectively reduces the compressibility of clayey soil.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Consolidation Properties of Nano-Bentonite Mixed Clayey Soil

et al. 2020

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“…The results show that the unconfined compressive strength of the soil samples increases with NM content and decreases with higher soil water content. They also showed that the addition of 6% NM to clay soil can significantly improve the strength and stability of the soil [18]. Modarres and Mohammadi Nosoudy (2015) resulted that the combination of coal waste materials with lime in considerably higher compressive strength and CBR especially in saturated condition [19].…”

Section: Introductionmentioning

confidence: 98%

“…Test results showed that the addition of recycled bassanite improves the strength of the tested soil [17]. Gao et al (2015) tested the effects of nanometer magnesium oxide (NM) on a clay soil. The results show that the unconfined compressive strength of the soil samples increases with NM content and decreases with higher soil water content.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Softening of Clayey Soil Stabilized with Sewage Sludge Ash and Lime

2018

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Production of sewage sludge have raised increasing concerns due to negative environmental effect. Sewage Sludge Ash (SSA) is used as a new type of additive for clay. Laboratory tests were performed on clay samples to study the mechanism of sewage sludge ash (SSA) and Hydrated Lime (HL) soil stabilization. Different SSA contents (0, 5, 10, 15%) and hydrated lime (0, 1, 3 and 5%) were added to the soil samples. 288 samples were prepared, and unconfined compressive strength tests were carried out. The samples were tested under optimum water content and also saturated conditions with three replications. The results of the coefficient of softening indicated that by adding SSA and hydrated lime to clay soil simultaneously, the stabilized clay soils can be applied in the moist and saturated condition. According to the results, the samples of SSA contents 0% with hydrated lime 5% and SSA contents 10% with hydrated lime 5% can be placed in the vicinity of moisture.

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“…As the most promising material in the 21st century, nanomaterials have been widely used in various fields due to its excellent properties [19][20][21][22]. Gao and coworkers [23,24] explored the influence of nano-MgO on the mechanical performance of soft clay via an unconfined compression test, and the research indicated that the engineering properties of soft clay could be improved by adding an appropriate amount of nano-MgO. Wang et al [25] found that nano-MgO can modify the shear performance of cement silty clay through the direct shear test, and the optimal blending ratio is 5‰.…”

Section: Introductionmentioning

confidence: 99%

Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement

Wang

Jian

2021

Geofluids

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Calcareous sand is developed by the fracture of marine biological skeleton under the impact of seawater. Calcareous sand is not transported in the process of deposition. Therefore, calcareous sand retains the characteristics of marine biological skeleton, low strength, and porous. In order to study the effect of nanoclay and cement on the modification of calcareous sand, a series of tests were carried out on the modified cement calcareous sand (CCS) with different content of nanoclay. In this study, the triaxial mechanical properties and failure modes of nanoclay and cement composite modified calcareous sand (NCCS) were studied through the triaxial UU test. Then, SEM tests were carried out on CCS and NCCS samples, and the micromechanism of nanoclay and cement composite modified Nanhai calcareous sand was analyzed. The results showed that (1) the shear properties of CCS could be improved by adding nanoclay. The optimum admixture ratio of nanoclay was 8%, and its peak stress was 23%-39% higher than that of CCS. (2) The peak stress and strain of NCCS showed a linear correlation. (3) Compared with CCS, the internal friction angle and cohesion of NCCS were increased by 5.2% and 52%, respectively. (4) Nanoclay could improve the compactness and structure of cement calcareous sand, and the macroscopic performance is the improvement of peak stress and cohesion.

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Experimental Study of Nanometer Magnesium Oxide-Modified Clay

Cited by 27 publications

References 28 publications

Experimental Investigation of Consolidation Properties of Nano-Bentonite Mixed Clayey Soil

Experimental Investigation of Consolidation Properties of Nano-Bentonite Mixed Clayey Soil

Evaluation of Softening of Clayey Soil Stabilized with Sewage Sludge Ash and Lime

Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement

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