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• W563485904 abstract "This research showed that the ROSAN laser surface texture measurement system could be used to detect and measure various levels of gradation and aggregate-asphalt (flushing) segregation. A ratio of textures in segregated areas to that in non-segregated areas was used to define texture limits. These ratios were selected based on statistically different changes in mix stiffness, air voids, gradations and asphalt content. The limits were adjusted slightly so that the buyer's and seller's risk were approximately evenly split. While texture changes are usually the result of gradation segregation, changes in the surface texture can also indicate differences in density due to temperature segregation. Segregation as used in this paper includes both gradation and temperature segregation. Destructive testing is required to discern which type of segregation is responsible for the texture anomalies. A texture ratio of between 1.17 and 1.56 defines a low level of segregation. Mixture properties in areas with low segregation are expected to have a mix stiffness of between 70 and 90 percent of the non-segregated mixture. Air voids will be between 0 and 4 percent higher, gradations will have one or more sieves that are at least 5 percent coarser than the non-segregated areas with a corresponding decrease in asphalt contents of between 0.3 and 0.75 percent. A texture ratio of between 1.57 and 2.09 defines a medium level of segregation. Mixtures with this level of segregation will have a mix stiffness of between about 50 to 70 percent of the non-segregated mix. Air voids will increase by 2 to 6 percent, gradations will have two or more sieves that are at least 10 percent coarser than the non-segregated areas with a corresponding decrease in asphalt contents of between 0.75 and 1.3 percent. A texture ratio greater than 2.09 defines a high level of segregation. Mixtures in these areas will have a stiffness of less than 30 percent of the non-segregated mix. Cores taken from these areas will tend to fall apart. Air voids will be more than 4 percent higher and gradations will have three or more sieves that are at least 15 percent coarser than non-segregated areas with a corresponding decrease in asphalt contents of more than 1.3 percent. Ratios of less than 0.75 will indicate area either rich in fine aggregates or with at least a low level of flushing. While limits to distinguish between low, medium and high levels of flushing are suggested, only a limited number of data points were obtained for pavements with these problems. An analysis approach for setting texture limits based on these ratios was formulated first developing a prediction equation for estimating the texture in the non-segregated areas for information on the maximum aggregate size, percent passing the 4.75-mm sieve, and the coefficients of curvature and uniformity. This value is then used as the mean non-segregation texture that is multiplied by the various ratios to obtain the texture limits associated with the different level." @default.
• W563485904 created "2016-06-24" @default.
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• W563485904 date "2000-01-01" @default.
• W563485904 modified "2023-09-26" @default.
• W563485904 title "APPLICATION OF ROSAN HIGH FREQUENCY LASER SURFACE TEXTURE MEASUREMENTS TO CONTROL HMA SEGREGATION" @default.
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