SURFACE DRESSINGS - COMMENTS ON TESTS CONDUCTED BY THE LCPC, SETRA AND CETE IN LILLE TO STUDY THE SHAPE OF AGGREGATES AND COVERING ABILITY

WITH A VIEW TO PROMOTING THE SURFACE DRESSING TECHNIQUE, TO MAKING A BETTER EVALUATION OF THE INGREDIENTS AND TO IMPROVING THE LATTER, LCPC AND SETRA HAVE CARRIED OUT AN AUTOMATIC AND SYSTEMATIC CONTROL OF EXISTING AND NEW FORMULAE. SPECIAL TESTS WERE CONDUCTED ON THE RN17 TO MAKE A SPECIAL STUDY OF THE SHAPE OF THE AGGREGATES AND POSSIBILITIES OF CORRECTION (VARIABLE BINDER CONTENT) AS A FUNCTION OF COVERING ABILITY. THE EXPERIMENTAL SECTIONS WERE SYSTEMATICALLY OBSERVED. THE RESULTS OBTAINED CONFIRM THE ROLE PLAYED BY SHAPE AND SHOW THE MAGNITUDE IN DIFFERENCE AFTER 2 YEARS OF SERVICE.