Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Summary Roadway Failure Study No. ii
The report summarizes the major accomplishments in the two phases of the study. The purpose of the 'Lateral Cracking of Asphaltic Concrete' phase was to examine the relationship of asphalt aging to the alteration of mix properties and to the variation in frequency of lateral cracking of asphaltic concrete pavements. At three field test sites, temperature differentials of 11F per inch of pavement thickness were observed during the winter period. The width of artificial joints increased with decrease of pavement temperature. Artificial joints or weakness planes, at 5-ft. spacing, were effective in controlling lateral cracking during the year of observations. At one site, subgrade friction tests were conducted by measuring the horizontal force necessary to cause movement of the pavement on the subgrade. In laboratory tests, elastic modulus, ultimate strength intension and linear thermal expansion coefficient were determined on initial and aged pavement specimens. Laboratory tests were also conducted to determine the characteristics of mixtures and asphalts recovered from pavements after varying periods of service and varying service performance. Asphalt composition changed with increasing age in pavement areas having lateral cracking. Higher degrees of hardening of asphalts occurred in pavements with high air void contents. Differences in pavement performance were related to asphalt stiffness and filler concentration. Laboratory investigations were made to characterize the temperature - dependent consistency of asphalts in combination with various concentrations of mineral fillers. Increased filler content produced increased stiffness of the resulting mixtures. (Author)
Summary Roadway Failure Study No. ii
The report summarizes the major accomplishments in the two phases of the study. The purpose of the 'Lateral Cracking of Asphaltic Concrete' phase was to examine the relationship of asphalt aging to the alteration of mix properties and to the variation in frequency of lateral cracking of asphaltic concrete pavements. At three field test sites, temperature differentials of 11F per inch of pavement thickness were observed during the winter period. The width of artificial joints increased with decrease of pavement temperature. Artificial joints or weakness planes, at 5-ft. spacing, were effective in controlling lateral cracking during the year of observations. At one site, subgrade friction tests were conducted by measuring the horizontal force necessary to cause movement of the pavement on the subgrade. In laboratory tests, elastic modulus, ultimate strength intension and linear thermal expansion coefficient were determined on initial and aged pavement specimens. Laboratory tests were also conducted to determine the characteristics of mixtures and asphalts recovered from pavements after varying periods of service and varying service performance. Asphalt composition changed with increasing age in pavement areas having lateral cracking. Higher degrees of hardening of asphalts occurred in pavements with high air void contents. Differences in pavement performance were related to asphalt stiffness and filler concentration. Laboratory investigations were made to characterize the temperature - dependent consistency of asphalts in combination with various concentrations of mineral fillers. Increased filler content produced increased stiffness of the resulting mixtures. (Author)
Summary Roadway Failure Study No. ii
D. R. Lamb (Autor:in) / W. G. Scott (Autor:in) / R. H. Gietz (Autor:in) / J. D. Armigo (Autor:in)
1967
36 pages
Report
Keine Angabe
Englisch
Civil Engineering , Ceramics, Refractories, & Glass , Miscellaneous Materials , Pavements , Asphalt , Concrete , Cracks , Failure(Mechanics) , Temperature , Aging(Materials) , Thermal stresses , Performance(Engineering) , Tensile properties , Friction , Penetration , Viscosity , Measurement , Thickness , Roads , Wyoming
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