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EXAMPLE OF MARSHALL METHOD OF
HOT-MIX DESIGN A typical mix design is illustrated by the calculations and graphs shown on figures 17-5 through 17-10. Aggregate Grading An aggregate grading chart is shown in figure 17-5 (DD Form 1207). This chart shows the gradation curves of the three aggregates that are available for the mix. The sieve analyses are run in the manner as described in the EA3 TRAMAN. Calculations may be made and data recorded on standard sieve analysis data sheets before the curves are drawn. A gradation curve is not shown for the mineral filler to be used. Aggregate Blending The front and back sides of a data and computation sheet for aggregate blending is shown in figures 17-6A and 17-6B (DD Form 1217). The gradation of the available aggregates should be recorded on the upperpart (fig. 17-6A) of the form. The lower part (fig. 17-6A) may be used for the computation of the trial blend. Several attempts may be required before a blend meeting specifications is obtained. The cold feeds (quantities per batch) of aggregate to the asphalt plant
Figure 17-5.Aggregate grading chart, stockpile materials.
Figure 17-6A.Bituminous mix design, aggregate blending, data sheet (front).
Figure 17-6B.Bituminous mix design, aggregate blending, data sheet (back).
Figure 17-7.Aggregate grading chart, specification limits and gradation of blended aggregate.
Figure 17-8.Specific gravity of bituminous mix components, data sheet.
Figure 17-9A.Test results, Marshall stability test (front).
Figure 17-9B.Test results, Marshall stability test (back).
Figure 17-10.Asphalt mix curves, Marshall test properties. are set according to the proportions obtained in the computation of the final trial blend. |
 
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