Disadvantages Of Flexible Pavement

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Abstract: Flexible pavements are the most commonly used form of pavement and have four component layers namely Sub-grade, Sub-base and base and surface courses which are made up of materials like natural soils, sand, morrum etc., are proved to be costly in terms of construction as well as maintenance. Performance of Flexible Pavement depends on the functions of the component layers especially Sub-grade. Sub-grade is compacted layer of soil, provides the lateral support to the pavement. Construction over soft Sub-grade affects the performance of pavement and results in shorter life of pavement. The typical approach of stabilization of soft Sub-grade is to remove the soft soil, and replace it with soil of high strength. The high cost of replacement…show more content…
Disposal of these large quantities of quarry dust produces serious problem in environment and health hazard. There is requirement to utilize these waste materials. Quarry dust can be used in very large quantity, reducing the total cost of construction in addition to providing a solution to an environmental problem. 2. Characteristics of crusher dust Every day, quarries move large amounts of stones and aggregate In the process of removing these materials from the earth and moving them, quarries create a large amount of dust that is made from very small stone particles, known as crusher dust. Crusher dust is also created when metals such as iron ore are separated from iron ore and the resulting slag is crushed into fine particles. Crusher dust looks much like sand but is made up of angular particles with a rough surface. Some of the characteristics…show more content…
It has a good permeability and variation in water content does not seriously affect its desirable properties. Crusher dust proved to be a promising substitute for sand and can be used to improve the engineering properties of soils. The dry density increased with the addition of Crusher dust with attendant decrease in the optimum moisture content. Crusher dusts use less water than other alternatives and have excellent load bearing capabilities and durability. Crusher dust is fire and heat resistant; non-plastic. As the stability of flexible pavements depends upon the particle friction and cohesion, cohesive frictional soils are the best suitable for the construction of flexible pavements. The clayey soils are lagging in its friction and the crusher dust in its cohesion. Binding of these two soils gives the combination of cohesive frictional soils which is best suitable for the stability of flexible pavements. 4. Materials Used Clay Soil: Clay soil has been used as base material in the study. Clay soil is collected from shallow depth from the nearby Rajajinagar Colony in Hanamkonda

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