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This document discusses different aspects of national highways in India. It outlines the different types of roads including national highways, state highways, and village roads. It describes the various elements that make up a road's cross section such as the pavement surface, width, and right of way. The document also discusses the different types of pavement, layers of a pavement, materials used in road construction such as bitumen and aggregate, and various tests used to evaluate the properties of aggregates, bitumen, soil and traffic signs.
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This document summarizes information about flexible pavements. It discusses the typical layers of flexible pavement, including the surface layer, base layer, and subbase layer. It also outlines factors that affect pavement design, such as wheel load, axle configuration, vehicle speed, subgrade type, and temperature. Finally, it proposes using plastic waste in flexible pavement construction as an innovative way to strengthen roads and increase their lifespan while providing an environmentally friendly use for plastic waste.
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Components of highway pavement and materials used. Soil: Importance, Desirable properties, Index properties, Compaction, Strength evaluation tests. Aggregate: Functions, Desirable properties, Tests on road aggregates and quality control. Bituminous binders: Functions, Desirable properties, Tests on bitumen and quality control, Bitumen emulsion functions and classification, Modified bituminous binder functions and classification. Bituminous Mix: Desirable properties and requirement of design mix, general approach for design of bituminous mixes and introduction to Marshall Mix Design Method
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