Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The Effect of Viscosity of Asphalt on the Properties of Bituminous Paving Mixtures. Part I. Hardening of Asphalt in Hot Bituminous Base, Binder, and Sand Mixtures
The purpose of this investigation was to study the effect of the viscosity of the asphaltic binder on the mixing, laying, and compaction of hot bituminous base, binder, and sand asphalt mixes, and to observe the performance under traffic of test strips laid from these mixes. Four test strips were laid for each of the above mixes in which the mix viscosity of the asphaltic binder was varied from approximately 930 to 40 Saybolt Furol Seconds. Temperatures were measured in the pavement at four different elevations during rolling operations. Ross counts were made on the base and binder mixes as they left the mix box, laying characteristics of the mixes were observed, and densities were measured on the finished pavements. Samples of pavement were taken immediately after laying, after 10 months and after 21 or 22 months, and the asphalt extracted and recovered. Penetrations and viscosities were determined on the recovered asphalts. Ross counts and visual inspection showed incomplete coating of the aggregate for all mixes at the high mix viscosities. Base and binder mixes laid satisfactory at all mix temperatures but the sand asphalt showed some tearing at the higher mix viscosities. There was a slight tendency toward higher densities with higher mix temperatures. There was definitely greater hardening in the mix box with increased mix temperature. However, as the strips aged this relationship showed some change. The base and binder mixes made at 250F showed the least hardening after 10 months and 22 months service. Sand asphalt strips showed similar hardness after 21 months. The thicker pavement layers hardened more slowly than thin layers. (Author)
The Effect of Viscosity of Asphalt on the Properties of Bituminous Paving Mixtures. Part I. Hardening of Asphalt in Hot Bituminous Base, Binder, and Sand Mixtures
The purpose of this investigation was to study the effect of the viscosity of the asphaltic binder on the mixing, laying, and compaction of hot bituminous base, binder, and sand asphalt mixes, and to observe the performance under traffic of test strips laid from these mixes. Four test strips were laid for each of the above mixes in which the mix viscosity of the asphaltic binder was varied from approximately 930 to 40 Saybolt Furol Seconds. Temperatures were measured in the pavement at four different elevations during rolling operations. Ross counts were made on the base and binder mixes as they left the mix box, laying characteristics of the mixes were observed, and densities were measured on the finished pavements. Samples of pavement were taken immediately after laying, after 10 months and after 21 or 22 months, and the asphalt extracted and recovered. Penetrations and viscosities were determined on the recovered asphalts. Ross counts and visual inspection showed incomplete coating of the aggregate for all mixes at the high mix viscosities. Base and binder mixes laid satisfactory at all mix temperatures but the sand asphalt showed some tearing at the higher mix viscosities. There was a slight tendency toward higher densities with higher mix temperatures. There was definitely greater hardening in the mix box with increased mix temperature. However, as the strips aged this relationship showed some change. The base and binder mixes made at 250F showed the least hardening after 10 months and 22 months service. Sand asphalt strips showed similar hardness after 21 months. The thicker pavement layers hardened more slowly than thin layers. (Author)
The Effect of Viscosity of Asphalt on the Properties of Bituminous Paving Mixtures. Part I. Hardening of Asphalt in Hot Bituminous Base, Binder, and Sand Mixtures
R. Bright (Autor:in) / J. Steele (Autor:in) / A. Justice (Autor:in)
1966
95 pages
Report
Keine Angabe
Englisch
Civil Engineering , Coatings, Colorants, & Finishes , Asphalt , Pavements , Bituminous coatings , Mixtures , Sand , Binders , Hardening , Viscosity , Temperature , Penetration , Traffic , Coatings , Visual inspection , Hardness , Tables , Aggregates
Engineering Index Backfile | 1957
Permanent Deformation In Idealised “Sand Asphalt” Bituminous Mixtures
| Taylor & Francis Verlag | 2001
Bituminous paving mixtures 2008
TIBKAT | 2008
Bituminous paving mixtures 2007
TIBKAT | 2007