Xem 1-10 trên 10 kết quả Highway materials
  • Environmental issues play a major role in the planning, design, construction, and rehabilitation of highways. Indeed, their prominence has grown as the public has become increasingly informed on environmental issues and associated requirements. This chapter provides an overview to lend guidance in understanding environmental issues, and information to aid in the process of effectively addressing the various requirements in this area.

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  • It can be argued that no company has dominated its own little portion of computer networking as completely as Cisco Systems. Market research has estimated that 70 percent of the Internet runs on Cisco hardware. This is an amazing statistic when you consider the number of manufacturers vying for market share in this arena. To put this number in perspective, imagine that seven out of every ten cars on the highway today were produced by a single car manufacturer. Why is Cisco hardware so popular? First and foremost is reliability.

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  • Applications of Composites in Highway Bridges 51.1 51.2 51.3 51.4 Introduction Material Properties Reinforcing Fibers • Matrix Materials Advantages and Disadvantages of Composites in Bridge Applications Pultruded Composite Shapes and Composite Cables Pultruded Composite Shapes • Composite Cables 51.5 51.6 FRP Reinforcing Bars for Concrete Composite Bridge Decks Advantages and Disadvantages • Composite Deck Systems • Truss-Type Deck System Joseph M.

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  • Statistics of Steel Weight of Highway Bridges 54.1 54.2 54.3 54.4 Introduction Design Criteria Live Loads • Materials 54 Database of Steel Weights Statistics of Steel Weights Simply Supported Noncomposite Plate Girder Bridges • Simply Supported Composite Plate Girder Bridges • Simply Supported Box-Girder Bridges • Continuously Supported Plate Girder Bridges • Continuously Supported Box-Girder Bridges • Truss Bridges • Arch Bridges • Rahmen Bridges (Rigid Frames) • Cable-Stayed Bridges 54.5 54.

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  • Systematic, well-designed research provides the most effective approach to the solution of many problems facing highway administrators and engineers. Often, highway problems are of local interest and can best be studied by highway departments individually or in cooperation with their state universities and others.

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  • In response to the enactment by the U.S. Congress of the Intermodal Surface Transportation Efficiency Act (ISTEA), the Federal Highway Administration (FHWA) requested that the National Research Council (NRC) conduct a study on nonconventional concrete technology for renewal of the highway infrastructure. ISTEA directed the FHWA to initiate a comprehensive, long-range infrastructure research and development (R&D) program.

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  • The transportation burden on the railroads and highways of the country has been tremendously increased by the war. There is a larger load to be carried, of manufactured goods, raw materials, and foodstuffs. Not only has production of manufactures, raw materials, and farm products increased, but it is now necessary to transport a much larger proportion of these goods over long distances. The burden is further increased by the fact that we have removed across the sea, 3,000 miles away, a considerable part of our population, which must be provisioned and maintained.

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  • We need economics because we as individuals and as a society experience scarcity (of raw materials, of goods and services, of time, and so on) in relationship to our ever-growing needs and wants. Economics examines how we make choices: a new car or college tuition? more hospitals or more highways? more free time or more income from work? It gives us a way of understanding how to make best use of natural resources, machinery, and people's work efforts.

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  • The maintenance of road pavements in England has become a costly necessity, due largely to the large volume of commercial vehicles using the roads which cause pavements to deteriorate quickly, and makes their repair more difficult to carry out. These roadworks incur not only direct works costs, but also indirect costs from factors such as congestion, motor accidents and pollution. There is obviously a need for cost-effective maintenance that minimises the occurrence and duration of these disruptions.

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  • The need for speed, the general attenuation of capital, and the simple fact that all the early railroads traversed thickly forested areas rendered wood the most logical material for bridge and other construction, both temporary and permanent. The use of wood as a bridge material did not, of course, originate with the railroads, or, for that matter, in this country.

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