摘要: The project includes nine field sections and a large number of material investigations. Assessments working health hazards have also been performed. Two different recycling machine systems, Wirtgen 4500 Plus Pyropaver 300E, used. Different types asphalt surface layers (dense grades asphalt, stone mastic porous dressing) recycled. Based on results documented in five technical reports, as well practical experience from great objects, constructed during 1993-95 but outside the project, following comments are made: (1) In general, quality recycled layer at inspection has assessed uniformly good; (2) chemical environment when using system is satisfactory; (3) current amounts mixture binder added small (<20% by weight <200 g/m2, respectively). Under such circumstances, it not possible to change properties original fundamentally. This, turn, means that difference mechanical final (recycled) generally small; (4) Recycling certain type with purpose obtaining same (for example, dense graded graded) associated any problems. However, this conclusion valid for pores contain relatively high proportion fine material; (5) variation test often high. object may vary, be composed more than one layer, milling depth vary distance between sampling points considerable; (6) mechanism influence binder/rejuvenator elucidated; (7) process heated does general contribute aggregate crushing; (8) Investigations indicated density transversely (Wirtgen Plus), which believed due segregation feeding screed. case, development augers necessary; (9) Laboratory investigations indicate 300E gives rise hardening corresponding 3-5epartmentC increase softening point (ring ball).
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