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Alternative Title:Solid rubber tire roller study : Louisiana highway research.
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Abstract:For several years this department has been conducing research studies on the compaction of asphaltic concrete pavements to obtain maximum pavement life with available local materials. This study, done in cooperation with the Bureau of Public Roads, was to investigate the effects of the solid rubber tire roller as an intermediate roller and to compare it to the currently used high intensity pneumatic roller.
The investigation was prompted by these claims: that the solid rubber tire roller was capable of compacting the mix using higher contact pressures at higher temperatures to obtain maximum density; that it could produce equal or higher densities with fewer passes.
The basis of comparison is on data obtained during and immediately after construction, and after 6 and 24 months of service. Comparative test sections with each roller were constructed on the binder course (limited to roadway cores taken one day after compaction) and on the wearing course lift (one day, 6 months and 24 months). A contact pressure of 85 psi was used and passes were varied from 5 to 15. Comparative results for each test section consisted of percent compaction on the original cores, increases in percent compaction, measurements of longitudinal grooves, and coefficients of variation of roadway densities.
The test sections of asphaltic concrete were the Louisiana Department of Highways Type I Mix, consisting of a combination of crushed gravel, sand, mineral filler and asphalt cement.
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