In Chapter 2, Table 2.1 cites the recommended ratios of individual SMA coarse aggregate fractions from the German DAV handbook (Druschner and Schafer, 2000). The comparison of the achieved result from Example II with ratios required in Germany is shown in Table 6.10.
The comparison in Table 6.10 shows that our SMA differs both from the original Zichner proportions and the contemporary ones recommended in Germany. The original German SMA does not contain such a great amount of the coarsest grains. Therefore let us design the same mix according to the German DAV proportions. The result is shown in Figure 6.8. The gradation curves of DAV and Zichner have a gentler shape, making laydown and compaction easier. Not using the maximum quantities of the coarsest grains makes the mix less open graded. Such an SMA mixture will probably be less permeable to water.
