Effects of electro-osmosis on the properties of high plasticity clay soil: Chemical and geotechnical investigations

2021 ◽  
Vol 880 ◽  
pp. 114890
Author(s):  
Hossein Azizi Mir Mahalleh ◽  
Mehdi Siavoshnia ◽  
Maryam Yazdi
Keyword(s):  
Clay Soil ◽  
High Plasticity ◽  
Geotechnical Investigations ◽  
Electro Osmosis ◽  
High Plasticity Clay

scholarly journals Effect of Selected Nanospheres on the Mechanical Strength of Lime-Stabilized High-Plasticity Clay Soils

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Ali Ghorbani ◽  
Hadi Hasanzadehshooiili ◽  
Mostafa Mohammadi ◽  
Fariborz Sianati ◽  
Mahdi Salimi ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Clay Soil ◽  
Fold Increase ◽  
Sem Analysis ◽  
High Plasticity ◽  
Nano Zno ◽  
Curing Conditions ◽  
Nano Zinc Oxide ◽  
High Plasticity Clay ◽  
Protective Structures

The proper design of protective structures may start from improving the characteristics of soils. In order to obtain reasonable safety criteria, several research studies have recently been dedicated to enhancing complex civil engineering structural systems with the use of nanotechnology. Thus, the following paper investigates the effect of nanospheres, including nanosilica (nano-SiO2) and nano zinc oxide (nano-ZnO), on lime-stabilized high-plasticity clay soil. For this purpose, unconfined compressive strength (UCS) and California bearing ratio (CBR) tests were performed on samples. The results showed that the use of the selected nanospheres greatly increased the UCS of the samples compared to untreated soil. The UCS value of samples containing 6% lime and 1.5% nano-ZnO after 28 days of treatment increased by 5-fold compared to the UCS of untreated samples. In addition, the samples containing 6% lime and 2% nano-SiO2, with similar curing conditions, experienced a 5.3-fold increase in their UCS value compared to the untreated samples. These compounds were considered as the optimal amounts and showed the highest mechanical strength in both UCS and CBR tests. The same trend was achieved in the CBR test, in which the CBR value for the optimal mixtures containing nano-ZnO and nano-SiO2 was 14.8 and 16.6 times higher than that of high-plasticity clay soil, respectively. Finally, the results obtained from scanning electron microscopy (SEM) analysis revealed that the nanospheres caused a dense and compact matrix to form in the soil, which led to the enhancement of the mechanical strength of the treated samples.

Shrinkage and Suction Properties of Pledger-Roebuck Alluvial Clay

1996 ◽  
Vol 1546 (1) ◽  
pp. 162-173 ◽  
Author(s):  
Christopher R. Clarke ◽  
James B. Nevels
Keyword(s):  
Clay Soil ◽  
Test Procedure ◽  
Soil Suction ◽  
High Plasticity ◽  
Sample Type ◽  
Undisturbed Samples ◽  
Limit Test ◽  
Different Depths ◽  
High Plasticity Clay ◽  
Alluvial Clay

The behavior of clays on drying leads to undesirable consequences with regard to high-plasticity clay subgrades and embankments. The soil suction and shrinkage properties of an alluvial clay soil were characterized. The CLOD shrinkage test procedure was found to be very effective in developing the experimental shrinkage curves. At the McCurtain County, Oklahoma, site, three types of samples were analyzed: undisturbed samples taken with thin-walled tubes, hand-augured soil chunks, and compacted standard Proctor samples. Results of the CLOD shrinkage tests for this site indicate consistent results regardless of the sample type and well-defined normal and residual segments of the shrinkage curve. Shrinkage limits estimated from the CLOD shrinkage curves were comparable with shrinkage limit test values. The effect of overconsolidation is reflected in the characteristic curves for different depths in the soil profile. A large suction range was calculated at the general air entry moisture content.

Stabilization of clayey subgrade with waste pumice for road infrastructure

2015 ◽  
Vol 22 (5) ◽  
Author(s):  
Ömür Çimen ◽  
Mehmet Saltan ◽  
S. Nilay Keskin
Keyword(s):  
Mechanical Properties ◽  
Road Construction ◽  
High Plasticity ◽  
Test Results ◽  
Index Properties ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Swelling Potential ◽  
Project Costs ◽  
High Plasticity Clay

AbstractHigh-plasticity clayey subgrade, which is unsuitable for road construction, may sometimes occur along highway routes. In such cases, engineers need to change the route of a highway project, resulting in an increase in road length and project costs. In this study, waste pumice was examined for stabilization of high-plasticity clayey subgrade, which is inappropriate for road construction. For this purpose, the physical and index properties of clay and pumice were determined. Then, the pumice was mixed with high plasticity clay at different ratios by weight. By performing standard Proctor compaction tests on the mixtures, the effects of adding pumice on compaction were also studied. Unconfined compression tests and California bearing ratio (CBR) tests were performed on all pumice-clay mixtures, and the test results and the CBR ratios were compared for each sample, respectively. The results showed that pumice stabilization improved the mechanical properties and reduced the swelling potential of high plasticity clayey subgrade.

Analysis of Three Dimensional Nonlinear Coupled Finite Element Based on some Concrete Rock-Fill Dam

2014 ◽  
Vol 998-999 ◽  
pp. 522-525
Author(s):  
Juan Juan Jin ◽  
Min He ◽  
Peng Liu
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
High Plasticity ◽  
Element Analysis ◽  
Rock Fill ◽  
Arching Effect ◽  
Earth Core ◽  
Gravel Soil ◽  
High Plasticity Clay ◽  
The Difference

As the future highest dam in the world, Shuang Jiang Kou rock-fill dam was the water retaining structure of homonymous hydropower station, a controlling engineering on Da Du River hydropower development, which is under design now. This dam is a central earth core dam with a height of 312 meters. A type of gravel soil stiffer than clay, which is made by artificial compounding of clay and gravel, is introduced to reduce the difference in displacement of earth core and rock filled shell zone. Because of the introduced less flexible central core, a more remarkable arching effect of the abutment on earth core might occur simultaneously. A three dimensional coupled nonlinear finite element analysis is carried out to study the three dimensional arching effect of Shuang Jiang Kou rock-fill dam. Computation results show that the arching effect is much notable. Then an innovation is proposed in design, in which a contact high-plasticity clay layer is introduced. It is verified that this innovation is effective and necessary.

scholarly journals Engineering Characterization of Subgrade Soils of Jimma Town, Ethiopia, for Roadway Design

Geosciences ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 94
Author(s):  
Alemineh Sorsa ◽  
Sanjaya Senadheera ◽  
Yoseph Birru
Keyword(s):  
Engineering Properties ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
High Plasticity ◽  
Soil Characterization ◽  
Engineering Structures ◽  
Undisturbed Soil ◽  
Subgrade Soil ◽  
Geotechnical Investigations ◽  
Jimma Town

Soils are naturally occurring materials that carry loads of civil engineering structures including roads and buildings. However, not all natural soils are suitable for such uses due to limited strength and instability under varying environmental conditions. A lack of adequate geotechnical investigations and soil characterization can result in the over-design of foundations, unexpected excavations to remove unsuitable soils, cost overruns, construction delays; and, contract disputes. In this research, an experimental plan was executed to determine the engineering properties of subgrade soil in Jimma Town in southwestern Ethiopia by using both disturbed and undisturbed soil samples. The plan included tests to determine the moisture content, specific gravity, grain-size analysis, Atterberg limits, compaction-density relationship, California Bearing Ratio (CBR), unconfined compression strength, and triaxial shear strength. X-ray diffraction (XRD) analysis was also conducted to determine the chemical composition of the soil. The soil characterization indicated that soft clay is the predominant subgrade soil type and that it has a very low load-bearing capacity, high plasticity, low strength and, high compressibility, which makes the soil unsuitable to serve as a highway subgrade without the help of soil improvement techniques.

Water Retention and Compressibility of a Lime-Treated, High Plasticity Clay

2013 ◽  
Vol 31 (4) ◽  
pp. 1171-1185 ◽  
Author(s):  
Maria Mavroulidou ◽  
Xiwei Zhang ◽  
Michael J. Gunn ◽  
Zeljko Cabarkapa
Keyword(s):  
Water Retention ◽  
High Plasticity ◽  
High Plasticity Clay
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