Literature review on laterite soil

Amadi A. Laterite is a highly weathered material, rich in secondary oxides of iron, aluminum, or both. Geotechnical investigation is one of the effective means of detecting and solving pre, syn and post constructional problems. The geotechnical properties of lateritic soils and their suitability for road construction have been evaluated for selected sites in Minna, North-central Nigeria.
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Throughout the country , weathering, leaching, and the formation of laterite hardpans hard, impervious layers composed chiefly of iron and aluminum oxides cemented by relatively insoluble materials by capillary movement the movement of water containing mineral salts to the surface and evaporation are common processes that vary in importance according to the characteristics of each locality. Leaching is more pronounced in the wet south, while the formation of laterite is more widespread in the drier north. In general, most soils are formed in place from parent rock material that has been subjected to prolonged erosion and consequently has limited fertility. In the forest zone the soils are mostly lateritic. They are subdivided into relatively fertile and less-acidic ochrosols red, brown, and yellow-brown, relatively well-drained soils in areas of moderate precipitation and into more-acidic and less-fertile oxisols in the extreme southwest, where annual precipitation exceeds 65 inches 1, mm. Ochrosols occur over considerable areas in the coastal and northern savanna zones. As in the forest zone, they are the best soils for agriculture.
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Soil stabilization is that the sempiternal physical and chemical substance transform of soils to enhance the physical lands of the earth. The trim power of the soil could be improved upon and deal with the shrink-swell lands of an ground by stabilization, in order that humanizing the strain manner ability of a sub-grade to keep up pavements and foundations. Stabilisation improves the compressive power, and additionally has a reduction of the permeability and encapsulates harmful factors. Stabilisation would improve high-risk factors into less soluble, mobile or dangerous forms. Mixing the correct and accurate mixture of binding reagents into unhygienic soils allows those to be either excavated or disposed of during a landfill, or re-used them on site to keep redevelopment.
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