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Methods for the determination of the modulus of elasticity of composite materials used in a pavement structure

Vinclerova S., Panulinova E., Kormanikova E., Kotrasova K.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

2009

z. 53 [265]

153-162

Road building materials are exposed to forces caused by traffic load, climatic influences, but above all to air temperature changes and moisture. These effects manifest themselves in the cyclic changes in a pavement structure and its sub-grade. Force effects induce complicated stress and strain condition in individual pavement layers. The strain of various materials caused by the same load is different and depends on their deformation characteristics. The deformation characteristics of road building materials are important inputs in the project and design of a road pavement structure. More demanding requirements on materials as well as ecological considerations regarding the utilization of materials in construction, and other issues, require more research and the creation of new materials with outstanding and more suitable physical properties than those offered by the current materials. One of the major research results is the discovery of modem materials called composites. The geometrical and physical structure of the composite material influences its overall characteristics. The analytical modelling of the particle components of composites, the so-called quasi-homogenous and quasi-isotropic models of compact materials, enables to assume and define these characteristics.

Dopravny hluk v meste a jeho vplyv na akustiku kvalitu prostredia

Panulinova E.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

2000

z. 32[180], cz.2

313-320

Tram and car traffic is the most common source of traffic noise in big cities. The traffic noise affects people either in the form of the specific influences - direct influences on cars, or in the form of unspecific influences that affect other systems of human being organism. Assuming this it is obvious that we should decrease the noise within our environment, or better to avoid it. The problems with the excessive traffic noise were monitored at one of the Kosice suburbs. The direct measurements of the volume traffic and noise density were carried out within the affected part of the city. On this basis it was possible to analyse the noise situation and propose the measures to decrease its undesirable effects. The obtained results have showed that the pre-set allowable noise levels given by relevant regulation were exceeded at each time and at each measurement place. On the basis of the evaluation of the obtained results we can conclude that the acoustic comfort in the monitored suburb is significantly disturbed. As the solution to this complicated problem we can propose the gradual elimination of negative occurrences using urban, architectural, technical, and organisational measures. To reach the optimal effect it is necessary to realise a few measures at once.