A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Effect of Viscosity of Asphalt on the Properties of Bituminous Mixtures Wearing Surface Mixtures
Twenty four, 600 foot test strips of a 1'' bituminous concrete wearing surface were laid in which mixing viscosities of the asphaltic binder were varied from approximately 900 to 40 Saybolt Furol Seconds. Twelve strips had crushed granite as the coarse aggregate and twelve other strips had a silicious gravel as coarse aggregate. For each set of twelve strips, three replications of mix temperature were used to give the desired range of mix viscosities. The 85 to 100 penetration asphalt source remained constant for all strips. Modified Ross Counts were made on the mixes, laying characteristics were observed, and density samples were cut from the finished pavements. While the pavement was compacted temperatures were measured at four different elevations in the pavement layer. Cores were cut from the pavements at 4, 9, and 21 months and penetrations and viscosities determined on the recovered asphalt. There appeared to be no marked differences in the mixing and laying characteristics of the mixes made at the wide range in viscosity. The average compaction obtained with the cold mixes was slightly less than that obtained at higher mix temperatures. The mixes made at low mix temperatures show a larger retained penetration immediately after mixing than those made at the higher mix temperature. However, after laying, the strips made at the lower mix temperatures hardened faster than those mixed at the higher temperatures; and after 21 months of service there was no great difference in the hardness of the strips. (Author)
The Effect of Viscosity of Asphalt on the Properties of Bituminous Mixtures Wearing Surface Mixtures
Twenty four, 600 foot test strips of a 1'' bituminous concrete wearing surface were laid in which mixing viscosities of the asphaltic binder were varied from approximately 900 to 40 Saybolt Furol Seconds. Twelve strips had crushed granite as the coarse aggregate and twelve other strips had a silicious gravel as coarse aggregate. For each set of twelve strips, three replications of mix temperature were used to give the desired range of mix viscosities. The 85 to 100 penetration asphalt source remained constant for all strips. Modified Ross Counts were made on the mixes, laying characteristics were observed, and density samples were cut from the finished pavements. While the pavement was compacted temperatures were measured at four different elevations in the pavement layer. Cores were cut from the pavements at 4, 9, and 21 months and penetrations and viscosities determined on the recovered asphalt. There appeared to be no marked differences in the mixing and laying characteristics of the mixes made at the wide range in viscosity. The average compaction obtained with the cold mixes was slightly less than that obtained at higher mix temperatures. The mixes made at low mix temperatures show a larger retained penetration immediately after mixing than those made at the higher mix temperature. However, after laying, the strips made at the lower mix temperatures hardened faster than those mixed at the higher temperatures; and after 21 months of service there was no great difference in the hardness of the strips. (Author)
The Effect of Viscosity of Asphalt on the Properties of Bituminous Mixtures Wearing Surface Mixtures
R. Bright (author) / B. Steed (author) / J. Steele (author) / A. Justice (author)
1964
105 pages
Report
No indication
English
Effect of viscosity of asphalt on properties of bituminous wearing surface mixtures
| Engineering Index Backfile | 1966
COLD BITUMINOUS MIXTURES FOR WEARING COURSES
| British Library Conference Proceedings | 2004
| British Library Online Contents | 1995