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Showing 1 to 20 of 53 for “"Clay Soils"”.
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Rapid Soil Stabilization of Soft Clay Soils for Contingency Airfields
… sought methods for rapid stabilization of weak soils for support of its missions worldwide. Over the past 60 years, cement and lime have consistently been found to be among the most effective stabilizers for road and airfield applications, although recent developments show promise using …
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Influence of penetration force in clay soils due to speed rate effect
… rate on the penetration resistance in clayey soils for five different speeds of penetrations. In order to install the pile through hydraulic system, it is crucial to understand the required penetration force needed to do the job. Generally, the penetration force and speed will be …
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Volume change behavior of clay soils and the effect on discrete fractures
… fractures in fine-grained soil such as clays in response to changing environmental conditions. Fractures serve as conduits for moisture transfer, which can lead to substantial shrinking and swelling of the surrounding fracture boundary soils. These volume changes, in turn, affect …
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The Effect of Cracks and Geo-Morphology on Evaporation from Clay Soils.
Crack development in soils and the associated potential for higher evaporation rates are pertinent to many agricultural and engineering applications. Many researchers have attempted to model crack formation though none have succeeded to comprehensively capture it. Chertkov's model uses only two …
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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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Characterization of Problematic Red Clay Soils in Arkansas for the Purpose of Onsite Wastewater System Placement
<p>Distinguishing between red-clay soils that are non-expansive and can reduce and red-clay soils developing in problematic red parent material, which are expansive, but also non-reducing, is key for proper on-site wastewater system placement. The Arkansas Department of Health allows for the …
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Engineering properties of sulphate-bearing clay soils stabilised with lime-activated ground granulated blast furnace slag (GCBS)
… porosity development of a laboratory prepared clay mix (kaolinite with and without 6% gypsum) and a natural sulphide-bearing clay soil, Lower Oxford Clay. Based on shear, compressive and indirect tensile strength testing, it was found that an increase in the stabiliser slag/lime ratio results …
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The Impact of soil structure and confining stress on the permeability of clay soils in brine environments
… done on the alteration of the permeability of clayey soils as a result of exposure to concentrated organic or inorganic permeants. These permeability changes have been attributed to either changes in the microfabric or the macrofabric of the clays as a result of physico-chemical interactions …
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Validation of N-STaR Nitrogen Rate Recommendations and Evaluation of N-STaR Soil Sampling Procedures for Clay Soils in Arkansas
… been developed, and the validation of N-STaR for clay soils is an important step in ensuring that N-STaR predicts correct N-fertilizer rates for rice under a delayed-flood production system. Small-plot trials located across Arkansas compared the N-STaR 95 and 100% relative grain yield (RGY) N …
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Characterizing methanogen and methanotroph diversity, abundance and activity within the Hampshire-Avon catchment
… low (chalk) to medium (greensand) to high BFI (clay). In general, methane oxidation potentials (MOP) and methane production potentials (MPP) were greater in river sediments compared to soils (particularly higher in clays). Sequence analysis identified Methanococcoides, Methanosarcina and …
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Denitrification and greenhouse gas emissions from cultivated and wetland alluvial soils
… benefits of restoration. Low-elevation, wetland clay soils exhibited 6.3 and 2.5 times greater denitrification potential than the high-elevation silt-loam and low-elevation clay soils under cultivation, respectively. Denitrification potentials of vegetated ditches were 1.3 to 4.2 times greater …
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Soil suction and swell behavior of chemically treated expansive clays
<p>"Expansive clay soils have caused significant damage throughout the world. Chemical stabilizing agents have been used to reduce the swelling potential of expansive clay soils. However, how chemically treating soils affects the matric and osmotic suction of soils has not been investigated. …
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Variations in the biodegradation potential of toluene with increasing depth in an unsaturated subsurface environment
… potential of BTX compounds in unsaturated soils under aerobic and anaerobic conditions. Toluene was used as a model compound at concentrations of 100 to 200 mg/L. An uncontaminated, groseclose soil ranging in depth from 0 to 18 feet was used in order to observe differences in microbial …
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Property Changes and Mechanisms in Lime-Stabilised Kaolinite in the Presence of Metal Sulphates
… heaving that can occur when sulphate bearing soils are encountered and, to a lesser degree, the relatively slow strength development which is produced.<br/><br/>Thus, the major objective of this work has been first to establish the fundamental material property changes which occur when clay …
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Environmental Factors Affecting the Landscape-Scale Spatio-Temporal Distribution of Small Mammal Assemblages Across the Northern Great Plains of North America
… composition of these assemblages. Cropland with clay soils was dominated by deer mice (Peromyscus maniculatus), whereas areas with higher proportions of native grassland and moderately sandy soils supported communities with more sagebrush voles (Lemmiscus curtatus). Areas with clay soils and …
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Hydraulic conductivity and chemical compatibility of some Victorian soils used as liners for waste containment
… in which compacted liners of predominantly clay soils are employed between waste and natural ground to act as barrier to chemical leaching. It follows that the design hydraulic conductivity of the clay is a governing parameter and many environmental regulations require this parameter to be …
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The Vascular Flora of Marion County, Mississippi
… plains with acidic to circumneutral sandy-clay soils. One major river system occurs in the county, the Pearl River basin, which bisects the county from north to south. In total, 168 families, 542 genera, and 1,274 vascular plant species and infraspecific taxa were recorded. Four hundred …
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Estudo da permeabilidade e estrutura de solo-cal
… bibliographic review is made on permeability of clay soils, and the modifications of physical soil properties due to lime treatment. A special permeameter was built which uses compressed air and permits saturation by back pressure. This apparatus is described and its use in routine work is …
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ΤΑΞΙΝΟΜΗΣΗ ΚΑΙ ΕΚΤΙΜΗΣΗ ΠΕΔΙΝΩΝ ΕΔΑΦΩΝ ΛΕΥΚΟΚΑΛΛΙΕΡΓΕΙΑΣ ΣΤΗ Β. ΕΛΛΑΔΑ
… POPLAR CLASSES I AND II, ARE SANDY, LOAMY AND CLAY LOAMYSOILS WITH GROUND WATER SURFACE BETWEEN 80CM AND 250CM MOST OF THE YEAR. LIGHTTEXTURED SOILS, LOAMY SAND WITH RICH IN ORGANIC MATTER HORIZONS IN DEPTH MORE THAN 80CM, OR CLAY AND SILTY CLAY SOILS WITH ADEQUATE ORGANIC MATTER WITH GOOD …
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