The components of stone matrix asphalt (SMA) and methods of SMA design have been discussed in the previous chapters of this book. In addition to the basic mix design processes, however, there are additional laboratory tests and procedures that are recommended to supplement the mix design work. Some unique tests focus on special properties of SMA mixes that may be encountered from time to time. Therefore it is necessary to undertake a short review of some selected tests. Some guidance is also offered on the interpretation of test results to avoid misunderstandings caused by inaccurately defined properties or incorrect test parameters. Such cases are also described in this chapter.
8.1 PREPARING SAMPLES IN A LABORATORY
At present, two methods of preparing samples in a laboratory are commonly applied worldwide: the use of a Marshall hammer or a gyratory compactor. These methods and the problems related to them will be discussed here. Comparisons of other laboratory methods of compacting samples may be found in several publications (Gourdon et al., 2000; Hunter et al., 2004; Renken, 2000).
