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Transportation Engineering

what is a freeway

A basic freeway segment is defined as a section of a divided roadway having two or more lanes in each direction, full access control, and traffic that is unaffected by merging or diverging movements near ramps. It is important to note that capacity analysis for divided roadways focuses on the traffic flow in one direction …

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mechanistic empirical pavement design guide

The Mechanistic-Empirical Pavement Design Guide (AASHTO 2008) is one of the more recent tools for the design and rehabilitation of pavement structures. The Mechanistic-Empirical Pavement Design Guide was developed to improve on the traditional pavement design procedures presented earlier in this chapter (AASHTO Guide for Design of Pavement Structures, 1993) by providing the ability to …

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what is flexible pavement

A flexible pavement is constructed with asphaltic cement and aggregates and usually consists of several layers, The lower layer is called the subgrade (the soil itself). The upper 6 to 8 inches of the subgrade is usually scarified and blended to provide a uniform material before it is compacted to maximum density. The next layer …

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what is rigid pavement

A rigid pavement is constructed with portland cement concrete (PCC) and aggregates, As with flexible pavements, the subgrade (the lower layer) is often scarified, blended, and compacted to maximum density. In rigid pavements, the base layer is optional, depending on the engineering properties of the subgrade. If the subgrade soil is poor and erodable, then …

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rigid pavement design

A rigid pavement is constructed with portland cement concrete (PCC) and aggregates, As with flexible pavements, the subgrade (the lower layer) is often scarified, blended, and compacted to maximum density. In rigid pavements, the base layer is optional, depending on the engineering properties of the subgrade. If the subgrade soil is poor and erodable, then …

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flexible pavement design

A flexible pavement is constructed with asphaltic cement and aggregates and usually consists of several layers, The lower layer is called the subgrade (the soil itself). The upper 6 to 8 inches of the subgrade is usually scarified and blended to provide a uniform material before it is compacted to maximum density. The next layer …

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pavement design

Pavements are among the costliest items associated with highway construction and maintenance, and are largely responsible for making the U.S. highway system the most expensive public works project undertaken by any society. Because the pavement and associated shoulder structures are the most expensive items to construct and maintain, it is important for highway engineers to …

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Cable Stayed Bridge

A typical cable-stayed bridge is a continuous deck with one or more towers erected above piers in the middle of the span. Cables stretch down diagonally from the towers and support the deck. Typical spans 110m to 480m. Cable Stay Towers Cable stayed bridges may be classified by the number of spans, number and type …

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Bridge Engineering

What is a bridge? A bridge is a structure that spans a divide such as: A stream/river/ravine/valley. Railroad track/roadway/waterway. Function of A Bridge A bridge has to carry a service (which may be highway or railway traffic, a footpath, public utilities, etc.) over an obstacle (which may be another road or railway, a river, a …

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Geometric Design of Highways

Definition of Geometric Design : geometric design of highways deals with the dimensions and layout of visible features of the highway. Geometric design fulfills the requirements of the driver and the vehicle, such as comfort, efficiency and safety. Goals of geometric design Maximize the comfort, safety and economy of facilities. Provide efficiency in traffic operation. …

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