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- Silfwerbrand, Johan
(författare)
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Dimensionering av tungt belastade industriytor
- 1994
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Rapport (refereegranskat)abstract
- For industrial and military purposes, there is a need of rigid pavements that can be used for heavy trucks. Some full-loaded trucks have a total weight of 100 tons, sometimes more. Often, the main part (above 90 per cent) of this weight is carried by only one axle. The experience of industrial concrete pavements is good. Usually, they have been designed empirically. There is, however, a need of simple design tools based on established theory for concrete pavements. The Swedish Cement and Concrete Research Institute (CBI) has had a commission from the Swedish cement producer Cementa to develop such tools._x000D_ _x000D_ In the first part of present report, design diagrams for industrial pavements are presented. Knowing axle load, total number of vehicles, and type of subgrade, the concrete thickness can be read easily for following pavement types: concrete, roller compacted concrete, concrete on lean concrete, and roller compacted concrete on lean concrete. Concrete and roller compacted concrete pavements are treated as two different alternatives, since the materials have different strength development and only the concrete pavement joints are provided with dowels. At present, there is no practical method to provide roller compacted concrete pavement joints with dowels._x000D_ _x000D_ In the second part of the report, theory, assumptions, and calculations forming the basis for the diagrams are described and discussed. This part consists a thorough discussion on estimation of -c stresses close to the pavement joints and temperature stresses._x000D_ _x000D_ An industrial pavement does not need to be as even as a highway and some cracking can be accepted without a detrimental influence on the intended traffic of low-velocity trucks with large wheels. Consequently, strength development, lateral distribution of the traffic, and the fact that not all vehicles are full-loaded are used to reduce the pavement thicknesses without jeopardizing the safety. A design procedure, based on a lower level of safety is also included in the report. It can be used, if a certain amount of cracking can be accepted at the end of the intended service life of the industrial pavement._x000D_ _x000D_ Originally, other types of industrial pavements, such as interlocking block pavements, continuously reinforced concrete pavements, and steel fibre reinforced concrete pavements, also were included in the project. Due to different reasons, the development of design procedures for these pavements have been postponed.
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