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Showing 1 to 20 of 59 for “"Clay soil"”.
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Inorganic contaminant transport through unsaturated clay soil
… studies have been conducted on the saturated soil by many researchers. The literature review emphasizes that the problem of the unsaturated transport of contaminants through porous media has received little attention. Thus, the present work is carried out to contribute to the study of heavy …
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Lime Stabilization of a Virginia Clay Soil
The fact that when lime is added to clayey soils same very beneficial results are produced dates back into the remote past. It is not a new development, In the United States lime has been in use since l923. The objective of this study was to determine the effect of increasing soaking time of …
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Lime, cement, and lime-cement stabilization of a clay soil
… was to study the variations of strength in a soil after it had been stabilized with various percentages of lime, cement, and combinations of the two. In both cases where the additives were added separately to the soil, the percentages used were 5 and 10 per cent by dry weight of soil. In the …
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Circular dry cement inclusions: a novel approach to stabilising clay soil
… This project undertook an initiative approach to soil stabilisation, with a key aim of establishing whether or not a deliberate inclusion of dry Portland cement would induce consolidation in a clay soil, by transferring and fixating pore water into the cement and changing the structure of the …
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CBR and unconfined compressive strength tests on a lime stabilized clay soil
… following: 1. Lime increases the strength of the soil. This effect was very significant on the dry side. 2. Up to five percent addition of lime produced little increase in strength. This value may be considered as a fixation value of lime for this soil. 3. Curing increased the UCS and CBR of …
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Methane Emissions from Direct-Seeded, Delayed-Flood Rice Grown on a Clay Soil
… to the production of methane (CH4) under flooded-soil conditions, rice (Oryza sativa L.) cultivation is a major contributor to agricultural CH4 emissions. Studies examining CH4 emissions from rice have only recently been initiated in Arkansas and no data have been collected from rice produced on …
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An investigation into the use of smectitic clay soil for the containment and treatment of petrochemical waste
… quantities of organic substances into soil, from which they are subject to possible transport into underlying groundwater. Many of these organic chemicals are potentially toxic (Wilson et al., 1981). Information is required concerning the chemical and physical behaviour of organic …
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A Comparative Study on the Efficacy of Modified Clay Soil for the Decolouration of Acidic and Basic Textile Dyes: A Case Study
… remove dyes from wastewater by utilizing natural clay as an adsorbent. The efficacy of Mn²⁺/Al³⁺ oxide-modified Mukondeni black clay soil (smectite) in removing acidic (Methyl Orange, MO) and basic (Crystal Violet, CV) textile dyes was evaluated. A 1:3 modified smectite ratio was identified as the …
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Removal of nickel and lead from natural clay soil through the introduction of EDTA and coupling ion exchange processes with electrokinetic methodology
In clay soils having low initial pH values, electrokinetic transport of heavy metals has proven to be effective. The transport of these metals is predicated on maintaining a low pH throughout the cell, which in turn keeps the metals in the pore water phase, where they are accessible to EK …
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Fabrication of metal-oxide modified porous ceramic granules from aluminosilicate clay soils for defluoridation of groundwater
… This study aimed at activating aluminosilicate clay soil mechanochemically, modifying aluminosilicate clay soil with Al-oxide and fabricating porous ceramic granules using Al-oxide modified mechanochemically activated aluminosilicate clay soil/ mechanochemically activated clay soil/ corn starch …
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Natural transformation and growth inhibition of azotobacter vinelandii in the presence of adsorbed oxytetracycline
… antimicrobials are introduced to agricultural soil through land application of manure. Both can persist in the environment if adsorbed to soil grains, allowing potential for increased antimicrobial resistance in the soil microbial community. Oxytetracycline (OTC) is a commonly used …
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An evaluation of carbon monoxide and methane as substrates for the denitrification of water
This study involved the use of soil and suspended growth microcosms to study the variation in groundwater denitrification rates using different substrates. Two gaseous substrates, carbon monoxide and methane, were studied and compared to a common liquid substrate, methanol. Denitrification with …
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Effect of freezing and thawing on unconfined compressive strength of clay-lime mixture with and without air entraining agent
… and thawing on the loss in strength of lime-soil mixture. 2. To investigate the effect of the addition of an air entraining agent on the freezing and thawing durability of lime-soil mixtures. For the first part, twelve specimens were prepared for each of 0, 5, 10, 15 and 20 percent …
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Bioremediation of modelled petroleum-contaminated soils of the Niger Delta and the impact of zeolite augmentation
… of modelled petroleum oil-contaminated soils of the Niger Delta by a mixed culture of three hydrocarbon-degrading bacteria, Acinetobacter sp, Rhodococcus sp and Pseudomonas sp, was investigated. These bacterial strains were selected based on criteria that they were able to utilize …
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Efficiency of PAHs removal from clayey soil using supercritical fluid extraction
The clay soil has specific properties that cause difficulty in the contaminated site assessment and the remediation process. The difficulty in extraction of HOC (hydrophobic organic compounds) from clay material was reported. Therefore, the SFE (supercritical fluid extraction) has a potential to …
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Properties and environmental impact from mosaic sludge industry incorporated into fired clay bricks
… utilization of these waste materials in fired clay bricks usually has positive effects on the properties such as lightweight bricks with improved shrinkage, porosity, and strength. The main objective of this study is to focus on the properties and environmental impact of the mosaic sludge …
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The effect of fly ash on clay
… of mixing fly ash with regional swelling of clayey soils indicated these mixtures were superior in certain engineering properties. Mixtures of clay soil, and fly ash at 10, 20, 30, and 40 percent exhibited reduced plasticity and swelling characteristics while the unconfined compression …
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Stabilisation of clay subgrade soils using ground granulated blastfurnace slag
Roads constructed on expansive clays may be adversely affected by the behaviour of the clay. Expansive clays suffer volume change due to changes in moisture content which causes heaving, cracking and the break up of the road pavement. Stabilisation of these types of soil is necessary to suppress …
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