Rheologische Kennwerte bitumenhaltiger Bindemittel zur Charakterisierung akustischer Eigenschaften von Asphaltdeckschichten

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of the acoustic characteristics of dense and open-porous asphalts (LOA 5 D, SMA 8 LA and PA 8). Regarding the development of surface textures, no correlation to the binders used could be established based on the investigations conducted in this work. In contrast, it was shown that both the choice of binder and the type of modification exert a significant influence on the compliance of asphalt. The temperature-dependent pavement parameter described with the help of mechanical impedance showed clear correlations to the viscosity/stiffness of the binder/asphalt used. The limits of the effective range of binders and thus the possibility for optimization were additionally determined by the existing void content of the asphalt. The main goal of this work, to identify an indicator in the form of a rheological characteristic value for describing the compliance component of asphalt (mechanical impedance) at the binder level, has been achieved with the help of the temperature- and frequency-dependent complex shear modulus G*. Further research efforts based on the findings gained in this work should make it possible in the future to develop acoustically optimized binder concepts regarding the asphalt parameter compliance. Abstract In conurbations, noise reduction becomes more and more important regarding the traffic-related planning and dimensioning of roads. The main reason for the noise exposure is the tyre-road-noise, which is basically affected by the three road parameter surface texture, open-cell character and compliance. The parameter compliance describes the temperature-dependent characteristics of a road which influence damping and thereby reduce the mechanical induced tyre-road-noise. Concerning the influence of the binder respectively the accordant rheological properties on these parameters, there are no substantiated scientific findings in this context so far. The focus of the experimental part of this paper was the assessment of the influence of the binder respectively the kind of modification on the resulting properties of the asphalt concerning the mechanical induced part of the tyre-road-noises. Describing the rheological characteristics of 25 selected binders was most important to be able to systematically pick out binders for the examination of acoustic attributes of dense and porous asphalts (LOA 5 D, SMA 8 LA and PA 8). Concerning the specification of the surface textures no correlation with the binders used during the examination could be found. In contrast it became evident that both, the selection of the binder and the kind of modification have significant impact on the compliance of asphalt. The temperature-dependent road surface parameter which was described with the help of the mechanical impedance showed significant correlations to the viscosity/ stiffness of the binder/ asphalt used. The limits of the support of the binder and therewith die potential to optimize were additionally determined by the existing void content of the asphalt. The main objective of this work was to identify an indicator to describe the compliance of asphalt (mechanical impedance) on the binder level in form of a rheological parameter; it worked out using the complex shear modulus G*, which depends on temperature and frequency. Further research based on the findings of this work is meant to enable the development of acoustically optimized binders concerning the asphalt parameter compliance. Summary Noise reduction is gaining increasing importance in traffic engineering planning and dimensioning of roads, particularly in metropolitan areas. The noise pollution results mainly from tire-pavement noise, which is primarily influenced by the three pavement parameters surface texture, open porosity, and compliance. Compliance describes the temperature-dependent properties of a pavement for dampening and thus for reducing mechanically induced tire-pavement noise. Regarding the influence of the binder or the corresponding rheological characteristic values on these parameters, no well-founded scientific knowledge exists in this context so far. The focus of the experimental part of the work was on evaluating the influence of the binder type or the type of modification on the resulting properties of an asphalt with regard to the mechanically induced portion of tire-pavement noise. The focus was on the rheological description of 25 selected binder concepts to enable a targeted selection for systematic investigation Abstract Noise reduction is becoming increasingly important in urban areas for traffic-related planning and design of roads. The noise pollution results mainly from tire-pavement noise, which is primarily influenced by the three pavement parameters surface texture, open porosity and compliance. Compliance describes the temperature-dependent properties of a pavement for damping and thus for reducing mechanically induced tire-pavement noises. Regarding the influence of the binder or the corresponding rheological parameters on these parameters, no well-founded scientific findings exist in this context so far. The focus of the experimental part of the work was on evaluating the influence of the binder type or the type of modification on the resulting properties of asphalt with regard to the mechanically induced portion of tire-pavement noises. The focus was on the rheological description of 25 selected binder concepts in order to enable a targeted selection for the systematic investigation of the acoustic characteristics of dense and open-porous asphalts (LOA 5 D, SMA 8 LA and PA 8). Regarding the development of surface textures, no relationship to the binders used could be established based on the investigations carried out in this work. In contrast, it was shown that both the choice of binder and the type of modification have a significant influence on the compliance of asphalt. The temperature-dependent pavement parameter described with the help of mechanical impedance showed clear correlations to the viscosity/stiffness of the binder/asphalt used. The limits of the effective range of the binders and thus the possibility for optimization were additionally determined by the existing void content of the asphalt. The main goal of this work, to identify an indicator in the form of a rheological parameter for describing the compliance component of asphalt (mechanical impedance) at the binder level, was achieved with the help of the temperature- and frequency-dependent complex shear modulus G*. Further research efforts based on the findings gained in this work should make it possible in the future to develop acoustically optimized binder concepts regarding the asphalt parameter compliance. Abstract In conurbations, noise reduction becomes more and more important regarding the traffic-related planning and dimensioning of roads. The main reason for the noise exposure is the tyre-road-noise, which is basically affected by the three road parameter surface texture, open-cell character and compliance. The parameter compliance describes the temperature-dependent characteristics of a road which influence damping and thereby reduce the mechanical induced tyre-road-noise. Concerning the influence of the binder respectively the accordant rheological properties on these parameters, there are no substantiated scientific findings in this context so far. The focus of the experimental part of this paper was the assessment of the influence of the binder respectively the kind of modification on the resulting properties of the asphalt concerning the mechanical induced part of the tyre-road-noises. Describing the rheological characteristics of 25 selected binders was most important to be able to systematically pick out binders for the examination of acoustic attributes of dense and porous asphalts (LOA 5 D, SMA 8 LA and PA 8). Concerning the specification of the surface textures no correlation with the binders used during the examination could be found. In contrast it became evident that both, the selection of the binder and the kind of modification have significant impact on the compliance of asphalt. The temperature-dependent road surface parameter which was described with the help of the mechanical impedance showed significant correlations to the viscosity/stiffness of the binder/asphalt used. The limits of the support of the binder and therewith the potential to optimize were additionally determined by the existing void content of the asphalt. The main objective of this work was to identify an indicator to describe the compliance of asphalt (mechanical impedance) on the binder level in form of a rheological parameter; it worked out using the complex shear modulus G*, which depends on temperature and frequency. Further research based on the findings of this work is meant to enable the development of acoustically optimized binders concerning the asphalt parameter compliance.