Download e-book for iPad: A manual for design of hot mix asphalt with commentary by National Research Council (U.S.). Transportation Research

By National Research Council (U.S.). Transportation Research Board.; National Cooperative Highway Research Program.; American Association of State Highway and Transportation Officials.; United States. Federal Highway Administration.; Advanced Asphalt Technol

ISBN-10: 0309155649

ISBN-13: 9780309155649

ISBN-10: 1621982343

ISBN-13: 9781621982340

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6%. It should be pointed out that there are slightly different ways of calculating these values for sieve analyses, and those responsible for HMA mix design and associated testing should follow the procedures as required by their state agencies. The results of aggregate sieve analyses are usually presented graphically, by plotting percent passing against sieve size in mm. Sieve size is often plotted on a logarithmic scale. Figure 4-3 is a plot of the results of the example sieve analysis given in Table 4-2.

At the bottom of the sieve stack is a pan, in which material is collected that has completely passed through the stack of sieves. The aggregate on each sieve is then weighed, and calculations are performed to determine the percent passing for each sieve. In performing a sieve analysis, there are several important considerations: • The weight of the test sample must be large enough to produce reliable test results. Larger aggregate sizes will require larger sample sizes. Table 4-1 lists minimum weights for test samples for sieve analysis for different NMAS values.

3 to < 3 3 to < 10 10 to < 30 30 or more Depth of Pavement Layer from SurfaceA, mm 0 to 100 Below 100 ---B 40 45C 45C 45C ----40 40 45C Criteria are presented as percent air voids in loosely compacted fine aggregate. ADepth of pavement layer is measured from pavement surface to top of pavement layer within the pavement containing the given mixture. 75-mm nominal maximum aggregate size mixes. CThe FAA requirement of 45 may be reduced to 43 if experience with local conditions and materials indicate that this would produce HMA mixtures with adequate rut resistance under the given design traffic level.

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A manual for design of hot mix asphalt with commentary by National Research Council (U.S.). Transportation Research Board.; National Cooperative Highway Research Program.; American Association of State Highway and Transportation Officials.; United States. Federal Highway Administration.; Advanced Asphalt Technol


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