Highways Agency Reports

In the structural design of bituminous roads there is a need to evaluate the condition made by modifiers to dense bitumen macadam roadbases. The laying and early test results of eight roadbase materials all of nominally the same composition are described. They differ in that a variety of modifiers are used, some polymer modified and some with changes to binder grade and added filler. Initial creep results indicate significant differences between the materials; the FWD results are less conclusive.