By M. Stroup-Gardiner
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Extra info for Constructing Smooth Hot Mix Asphalt (HMA) Pavements
In the 1996's revised specification eight categories were classified. 152 2000 Interstate Non-Interstate 30 CONSTRUCTINGSMOOTH HOT MIX ASPHALT Analysis of Smoothness Data In this analysis, the total of 194 projects from 1992 to 2000 are grouped into the eight categories. The majority are divided and non-divided highway projects with at least two leveling opportunities. The number of divided projects with at least two opportunities is 77 while that of non-divided projects is 72. All of these projects with at least two leveling opportunities have asphalt concrete friction course (ACFC) or asphalt rubber concrete friction course (ARACFC).
512 m/km. Thus it seems that the window values in the current specification are high for category 3. 24 m/km are adopted in the current ADOT smoothness specification for category 2, divided highway projects with only one leveling opportunity (ACFC/ARACFC so far), and category 5, non-divided highway projects with only friction course. 717 m/kin for category 2 and 5, respectively. It seems that the window values in the current specification are high for category 5. 24 m/km are adopted in the current ADOT smoothness specification for category 3, non-divided highway projects with two or more leveling opportunities, and category 6, non-divided highway projects with only AC overlay.
There are no projects for category 4. Since the incentive or disincentive is determined for every one-tenth mile on each lane, one tenth of mile on each lane is treated as one sample in this smoothness analysis. 880 2500 Smoothness Comparison between Standard A CFC and ARA CFC A statistical t-test was made for interstate highway projects in category 1 to determine if there is a significant difference in smoothness between the two types of pavement surfaces. To eliminate the potential effect of the contractors' improvement on project smoothness over time on the comparison, only projects built in years 1994 and 1995 were included in this test.