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Objavljeno v: Gradbeni vestnik - 12 - 1967

Avtorji

prof. Isak Papo, inž.

»Ekvivalent tal« - metoda za termično dimenzioniranje fleksibilnih vozišč

UDK: 625.73

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Soil equivalent method

Synopsis
The author proposes a new method for Structural Design of Flexible Pavements Based on the Thermal Conductivity of Roadmaking Materials. He has named it »Soil equivalent method«.
In building technology is known »the brick wall equivalent«. The autor »borrowed« this idea and for structural design of pavements for comparison with other materials the soil at the natural moisture content is chosen as standard.
New terms such as »thermal factor« f and »frost design ratio« KMR are also proposed.
These two coefficients calculated for a number of different structures gave values which differ as follows: for f = 1,41 to 1,67, and for KMR = 0,60 to 0,71. However as a general guide values of f = 1,5 and KMR = 0,67 can be used. This means, that if the depth of frost penetration into the soil is known, then the thickness of the flexible pavement should be approximately two^thirds of that depth.
For a rapid estimation of thicknesses of flexible pavements the author has devised a nomogram (Fig. 5).
Although this method is not intended as a »standard«, it could be used as a correction in the case of light and medium traffic and deep frost penetration.

Synopsis

The author proposes a new method for Structural Design of Flexible Pavements Based on the Thermal Conductivity of Roadmaking Materials. He has named it »Soil equivalent method«.

In building technology is known »the brick wall equivalent«. The autor »borrowed« this idea and for structural design of pavements for comparison with other materials the soil at the natural moisture content is chosen as standard.

New terms such as »thermal factor« f and »frost design ratio« KMR are also proposed.

These two coefficients calculated for a number of different structures gave values which differ as follows: for f = 1,41 to 1,67, and for KMR = 0,60 to 0,71. However as a general guide values of f = 1,5 and KMR = 0,67 can be used. This means, that if the depth of frost penetration into the soil is known, then the thickness of the flexible pavement should be approximately two^thirds of that depth.

For a rapid estimation of thicknesses of flexible pavements the author has devised a nomogram (Fig. 5).

Although this method is not intended as a »standard«, it could be used as a correction in the case of light and medium traffic and deep frost penetration.

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