Dynamics of Pavement Structures by G. Martincek

By G. Martincek

This ebook offers a rigorous remedy of the elemental, mathematical behaviour of pavement buildings less than dynamic loading. the subject is of starting to be significance in financial layout of airplane runways and street pavements.

summary: This booklet offers a rigorous therapy of the elemental, mathematical behaviour of pavement constructions below dynamic loading. the subject is of transforming into value in financial layout of plane runways and road pavements

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23. Isochrones and damping parameter variations for mastic asphalt. The measurements were made by using mechanical impedance method on a series of 15 specimens of asphalt concrete in the temperature range −25 to +45 °C. The mean values of the measurement results at a frequency of 20 Hz and at resonance and anti-resonance natural frequencies are plotted in Fig. 27 as isotherms and in Fig. 28 as isochrones, together with the dependence of damping factor δ on temperature. The complex modulus of elasticity |E*| alters from the value |E*|=400 MPa at frequency 20 Hz and temperature T=45 °C to the value |E*|=21000 MPa at frequency 3000 Hz and temperature T=−25 °C.

Theoretical diagram for determination of Poisson’s ratio μ according to extreme ordinate of mechanical impedance function |Z*|min. 6 Dynamic viscoelastic properties of bituminous materials The bituminous materials of road construction have distinct features of viscoelastic behaviour. Measurements were performed with the mechanical impedance method using the scheme of cantilever elements measuring 5×5×30 cm from various bituminous materials. The results of measurements at temperature T=10, 20 and 40 °C, in the form of isochrones and damping parameter variations, are shown in Fig.

The differences of extreme values of normalized mechanical impedance Δ|Z*| in dB, obtained by measurement, give the possibility of evaluating the damping parameter δE or δG. The theoretical values of Δ|Z*| for longitudinal and torsional vibration are plotted in Figs. 5. 4. Frequency parameter nl of mechanical impedance function extrema for element with free ends. 5. Differences of extreme values of normalized mechanical impedance Δ|Z*| versus damping parameter δ for flexural vibration of an element with free ends.

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