ULTRA-THIN BITUMINOUS SURFACING FOR A PROFILED ROAD, AND ITS PROCESS OF PRODUCTION

摘要

THE ULTRA-THIN BITUMINOUS SURFACING COMPRISES TWO INTERMINGLED LAYERS (2,3), NAMELY A WATERPROOF BITUMINOUS LOWER LAYER (2) CONTAINING ABOUT 0.45 TO 0.70 KG/M2 OF RESIDUAL BITUMINOUS BINDER, AND AN OPEN UPPER LAYER (3) FORMED OF AGGREGATES COATED WITH A BITUMINOUS MORTAR, THE LOWER LAYER PENETRATING THE OPENINGS OF THE UPPER LAYER TO ABOUT 1/3 OF THE HEIGHT (H) OF THE LATTER THE UPPER LAYER BEING FORMED OF THREE TYPES OF COMBINED AGGREGATE GRADING ENVELOPES 0/6, 0/10 AND 0/14. FIGURE 1