Relations between some geotechnical properties of soft clayey soils near Montreal city (In French)

This study presents the effect of Kawergosk refinery waste oil on the geotechnical properties of Erbil clayey soils. A comparison of laboratory test results on uncontaminated clayey soils has been presented and examined. Refinery waste oil of Kawergosk (20 km west of Erbil city) was chosen as the contaminant. A disturbed soil samples were collected from the site which are remolded in the laboratory before each test to represent the field dry density (1.4 gm/cm3, 5.6% water content). Laboratory investigations were carried out on soil samples with 5%, 10%, 15%, and 20% of the waste oil, the results showed a considerable effect on the chemical soil characteristics, while a slight increase of the values of Atterberg limits was observed. A considerable effect on the values of one-dimensional consolidation test parameters has also been observed; the same observation has been seen for the values of direct shear test parameters. A reduction on the values of conductivity coefficient, K has been noticed with increase of contaminated percentage.

Download Full-text

Effect Lime and Recron Fibre on Geotechnical Properties of Black Cotton Soil

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.b3688.078219 ◽

2019 ◽

Vol 8 (2) ◽

pp. 6252-6257

Keyword(s):

Compressive Strength ◽

Soil Sample ◽

Unconfined Compressive Strength ◽

Geotechnical Properties ◽

Plasticity Index ◽

California Bearing Ratio ◽

Black Cotton Soil ◽

Optimum Dose ◽

Clayey Soils ◽

Limit Test

Clayey soils are considered as the weakest subgrade soil from civil engineering point of view under moist condition. These soils attract and absorb water and loses their strength. Because of this reason certain inherent properties of these clayey soils need modification for their bulk use in construction of highways, embankments etc. Recently, many synthetic fibres have emerged to strengthen soft soils. Synthetic fibres are low-cost materials, hydrophobic and chemically inert in nature which does not allow the absorption or reaction with soil moisture. The inclusion of synthetic fibres provides reinforcement to the soil and use of lime as a soil stabilizer in BC soil cut down the plasticity index and also increase its strength. For this an extensive laboratory test program was conducted to analyse the variation geotechnical properties of soil by changing the percentage of recron fibre at an optimum dose of lime. The laboratory tests include Atterberg Limit Test, Modified Proctor Test, Unconfined Compressive Strength Test and California Bearing Ratio Test. To conduct different tests on soil sample the proportion of lime is kept fixed and proportion of polyester recron fibre is varied from 0% to 1% by dry weight of soil sample for different lengths of fibre(6 mm, 12 mm & 18 mm separately). Optimum dose of lime is find out by plasticity index of BC soil mixed with varying percentages of lime (4%, 6%, 8% and 10%). Results of the experiments shows that with the increase in the appropriate percentage in recron fibre the Unconfined Compressive Strength and California Bearing Ratio increases. On increasing the length of Recron Fibre, the Unconfined Compressive Strength and California Bearing Ratio also increases. Combination of lime and recron fibre in BC soil give higher CBR value. Therefore it can be used in the improvement of Clayey Soil Subgrade in pavement design and in the construction of embankements.

Download Full-text

Study of Geotechnical Properties of Clayey Soils Contaminated by Various Oils

International Journal of Engineering Research and ◽

10.17577/ijertv9is050614 ◽

2020 ◽

Vol V9 (05) ◽

Author(s):

Swati Sukhwal ◽

Pradyumna Dashora ◽

Keyword(s):

Geotechnical Properties ◽

Clayey Soils

Download Full-text

Using Steel Slag for Stabilizing Clayey Soil in Sulaimani City-Iraq

Journal of Engineering ◽

10.31026/j.eng.2020.07.10 ◽

2020 ◽

Vol 26 (7) ◽

pp. 145-157

Author(s):

Zozk Kawa Abdalqadir ◽

Nihad Bahaaldeen Salih ◽

Soran Jabbar Hama Salih

Keyword(s):

Compressive Strength ◽

Moisture Content ◽

Unconfined Compressive Strength ◽

Clayey Soil ◽

Steel Slag ◽

Swelling Pressure ◽

Geotechnical Properties ◽

California Bearing Ratio ◽

Engineering Properties ◽

Clayey Soils

The clayey soils have the capability to swell and shrink with the variation in moisture content. Soil stabilization is a well-known technique, which is implemented to improve the geotechnical properties of soils. The massive quantities of waste materials are resulting from modern industry methods create disposal hazards in addition to environmental problems. The steel industry has a waste that can be used with low strength and weak engineering properties soils. This study is carried out to evaluate the effect of steel slag (SS) as a by-product of the geotechnical properties of clayey soil. A series of laboratory tests were conducted on natural and stabilized soils. SS was added by 0, 2.5, 5, 10, 15, and 20% to the soil. The conducted tests are consistency limits, specific gravity, hydrometer analysis, modified Proctor compaction, swelling pressure, swelling percent, unconfined compressive strength, and California Bearing Ratio (Soaked CBR). The results showed that the values of liquid limit, plasticity index, optimum moisture content, swelling pressure, and swelling percent were decreased when stabilized the soil. However, the values of maximum dry density, unconfined compressive strength, and California bearing ratio were increased with the addition of steel slag with various percentages to the clayey soil samples. The steel slag was found to be successfully improving the geotechnical properties of clayey soils.

Download Full-text

Some Geotechnical Properties of Clay Nanocomposites

Periodica Polytechnica Civil Engineering ◽

10.3311/ppci.9350 ◽

2016 ◽

Cited By ~ 1

Author(s):

Zeynep Nese Kurt ◽

Suat Akbulut

Keyword(s):

Geotechnical Properties ◽

Clay Soils ◽

Clay Nanocomposites ◽

Clayey Soils ◽

Test Results ◽

Natural Clay ◽

Acrylic Copolymer ◽

Water Interaction ◽

Nuclear Plants ◽

Locust Bean

Clay soils have various areas of use in geotechnical engineering.The common use of clayey soils are for landfills, dams,nuclear plants, etc. However, when the clay soils interactwith water, the geotechnical properties such as the swelling,the shear strength, and the compressibility properties ofclay change gradually. Therefore, in this research, using ahydrophobic organo-clay, polymers (locust bean gum, latex,glycerine, and vinyl acrylic copolymer), and rubber powder,clay-nanocomposites were developed to solve the problemsdue to the clay-water interaction encountered in the clay liners.This study focuses on the geotechnical properties of theclay-nanocomposites researched experimentally in laboratoryconditions. The test results found that, the specific gravities,consistency limits, compaction parameters, and unconfinedcompressive strengths of clay-nanocomposites change significantly,when compared to those of natural clay and hydrophobicorgano-clay.

Download Full-text

Effects of Lead and Gasoline Contamination on Geotechnical Properties of Clayey Soils

Soil and Sediment Contamination An International Journal ◽

10.1080/15320383.2020.1719973 ◽

2020 ◽

Vol 29 (3) ◽

pp. 340-354 ◽

Cited By ~ 2

Author(s):

Mehrdad Nazari Heris ◽

Soheil Aghajani ◽

Masoud Hajialilue-Bonab ◽

Hamed Vafaei Molamahmood

Keyword(s):

Geotechnical Properties ◽

Clayey Soils

Download Full-text

Geotechnical Properties of Black Cotton Soil Stabilized with Fly Ash and Geogrids

International Journal of PharmTech Research ◽

10.20902/ijptr.2019.120412 ◽

2019 ◽

Vol 12 (4) ◽

pp. 83-88

Author(s):

C. Rajakumar ◽

P. Kodanda Rama Rao

Keyword(s):

Fly Ash ◽

Marked Reduction ◽

Laboratory Tests ◽

Thermal Power ◽

Geotechnical Properties ◽

Waste Materials ◽

Black Cotton Soil ◽

Clayey Soils ◽

Power Stations ◽

Thermal Power Stations

Geotechnical properties of black cotton soil may need to be improved by stabilization to make such soils suitable for construction of highway pavements. Stabilization of such soils has been traditionally depend on treatment with lime, cement, chemicals and waste materials, etc. fly ash is a waste material obtained from thermal power stations. This paper presents the results of stabilization of local black cotton soil with fly ash and geogrid. Series of laboratory tests have been conducted with varying percentage of these stabilizers, added individually with and without geogrids, to determine their optimum percentages. From the results, it is observed that CBR value, for both soaked and unsoaked conditions, increases substantially by addition of 25% of fly ash with double layer of geogrids. The pavement designed with these improved values of CBR indicated a marked reduction in its thickness leading to economy in the construction of road pavements on or using clayey soils.

Download Full-text