Autor: Ejsmont, Jerzy. - Katalog OPAC zbiorów

Tytuł:: Hałaśliwość nawierzchni drogowych
Autorzy:: Gardziejczyk, Władysław
Ejsmont, Jerzy Antoni
Iwański, Marek
Powiązania:: https://bibliotekanauki.pl/books/2127715.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Opis:: W monografii zaprezentowano zagadnienia związane z całokształtem problemów dotyczących hałaśliwości nawierzchni drogowych. Wyniki pomiarów maksymalnego poziomu dźwięku stanowiły podstawę do oceny metody statystycznego przejazdu (SPB). W monografii przedstawiono nomogramy prezentujące poziomy emisji hałasu drogowego w zależności od charakterystyki nawierzchni, natężenia i struktury rodzajowej ruchu, które mogą być podstawą do obliczenia równoważnego poziomu dźwięku w otoczeniu trasy drogowej.
NOISINESS OF ROAD SURFACES Summary Low-noise pavements are an effective method of fighting excessive noise. They can contribute to the reduction of tyre/road noise level by even up to 10 dB. How- ever, it requires the use of appropriate technology for the wearing course and its proper maintenance during the use of the road. Currently, this type of pavement surfaces include porous asphalt and thin asphalt layers with a maximum grain size of no more than 8 mm. Research is also being carried out on the implementation of poroelastic pavements. Among the cement concrete pavements, the preferred choice of solution is texturing the surface by exposed aggregate cement concrete, and in recent years - texturing using diamond discs (techniques known as Next Generation Concrete Surface and Grinding & Grooving). In terms of acoustics, they are comparable with asphalt surfaces made of stone mastic asphalt. The monograph presents issues related to the overall problems related to the noisiness of road surfaces. The results of the maximum sound level measurements were the basis for the assessment of the SPB - Statistical Pass-By method. It was shown that the results obtained during field measurements using the SPB method should be analysed taking into account the required standard estimation error (Se) at a 95% confidence interval. As a result, the so-called outliers can be excluded from further analyses. The analysis of the results of noise measurements conducted with the methods CPX (Close-Proximity method) and CPB (Controlled Pass-By method) confirmed their usefulness in the assessment of noise of the surface. In the case of the CPX method, it was pointed out that special attention should be paid to the test tyre, and in the CPB method - to the choice of test vehicles. The results of considerations confirmed the effect of macrotexture on the level of generated sounds in the case of dense asphalt concrete and exposed aggregate cement concrete (EACC). Functional relations between the noise level and mean profile depth (MPD) and the logarithm of speed were developed. It was established that the stone mastic asphalt type SMA11 can be accepted in our country as the reference surface, for which the maximum sound level values were determined from the statistical passenger car and multi-axle heavy vehicle and third-octave band frequency. The previously proposed surface classification for noise has also been updated based on two equivalent criteria: maximum sound level from a pass- ing statistical passenger car at 80 km/h (according to the SPB method) and the value of the LCPX (80 km/h) (according to the CPX method). Errors associated with the production of asphalt mixes, laying of the wearing course or texturing of concrete surfaces may result in their acoustic inhomogeneity immediately after and during the period of operation. This applies mainly to layers with increased air void content. The monograph contains a proposition of assump- tions of a system for the certification of technology for the construction of road surfaces in terms of acoustics and a method for assessing the noise of the surfaces at the stage of their use. For dense asphalt concrete and exposed aggregate cement concrete the SPB method is used, along with the assessment of the surface macro- texture. In the case of a surface with an increased air void content and concrete isotropic surfaces - the CPX (possibly OBSI) and SPB methods are applied. The monograph presents nomograms of levels of road noise emissions depending on the characteristics of the surface, intensity and structure of the traffic, which may be the basis for calculating the equivalent sound level in the vicinity of the road. Pursuant to the EU Commission Directive 2015/996 of 19 May 2015, forecast- ing of the level of road noise should be implemented using the CNOSSOS-EU method and take into account the acoustic properties of road surfaces. SPB noise level results were used as the basis for determining the factors correcting the sur- face effect, which, after taking into account the noise generation model from a passing vehicle, may be included in the CNOSSOS-EU noise forecasting for vehicles of category 1 and 3.
Dostawca treści:: Biblioteka Nauki

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