By Thomas D. White, Sam R. Johnson, John J. Tzenas, John J. Yzenas
STP 1412 specializes in the impression of combination houses on HMA functionality and covers a variety of combination features. helpful info is gifted on functionality of HMA designed with Superpave protocols and standards for either combos and aggregates.12 papers deal with: mixture sharpening as a security predicament Contribution of the mineral combination parts to rutting resistance Superpave coarse and positive gradations Validity of the limited sector greatest combination sizes quantity of airborne dirt and dust, particle form, and coarse and wonderful combination particle angularity. This e-book is a worthwhile source for everybody within the paving that produces, specifies, and makes use of aggregates.
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Extra info for Aggregate Contribution to Hot Mix Asphalt (HMA) Performance (ASTM special technical publication, 1412)
Sample text
Abstract: This paper presents the research results of a laboratory study that evaluated the influence of mixture types and aggregate types to the rut-susceptibility of asphalt mixtures. Three types of mixtures were considered. These three mixtures were: 1) stone mastic asphalt (SMA), 2) coarse matrix high binder (CMHB) and, 3) dense-graded wearing course mixture. For the SMA mixtures, three types of aggregates, siliceous limestone, sandstone and novaculite were evaluated. For the other two mix types, crushed limestone was used.
Film thickness was affected by coarse aggregate and gradation types. Details of all statistical analyses can be found in Reference 3. Effect of Initial In-place Density and Deviationfrom Design A C to Rutting Performance The effect of initial in-place density on rutting performance is presented in Figure 3. Review of the figure confirms the common knowledge that over compaction is detrimental to performance. 9% of design STIADY ET AL. 1% air voids, respectively). These calculations of density with respect to design Gmb clearly show that field compaction equal to or greater than the design Gmb could lead to poor performance.
075), each over a range of five AC levels, and rutting performance measurements for 16 sections at WesTrack. 075 and AC calculated based on an assumption that the relationship between AV and either mixture variable can be represented as piecewise linear, as typically observed for Superpave mixtures. 075 values. 075 and AC values. 075. 5 percent). The analysis indicated that mixture sensitivity may affect optimum AC selection by up to one percent, and the resulting potential for changes in performance support use of a performance-related test in mixture design.