HOT ASPHALT-GRAVEL PAVEMENT STRENGTHENING

THE RN75 AND RN79 NATIONAL ROADS IN THE AIN DEPARTMENT WERE STRENGTHENED IN THE 1969 SPRING WITH A HOT-COATED GRAVEL- BITUMEN MIXTURE, A BITUMINOUS MIXTURE WITH A LOW BINDER CONTENT WHICH WAS LAID IN THICK LIFTS. THE MIX-DESIGN FORMULA WAS ESTABLISHED FOR THREE CRUSHED AGGREGATES, ONE OF WHICH WAS CRUSHED SAND WITH A HIGH FILLER CONTENT. THE PROPORTION OF 40/50 BITUMEN WAS 3.5 PER CENT AND THE NATIONAL FINES CONTENT WAS BETWEEN 6.5 AND 7 PER CENT. THE MIXTURE, LAID IN ONE SINGLE LAYER 15 CM THICK, GAVE EXCELLENT RESULTS AS REGARDS COMPACTION (7 TO 8 PER CENT VOIDS), FATIGUE TESTS AND DEFLECTION MEASUREMENTS. RESULTS OBTAINED WITH A 10 CM-THICK LAYER ARE LESS SATISFACTORY WITH REGARD TO DEFLECTION MEASUREMENTS. THESE RESULTS SHOW THAT IT IS POSSIBLE TO MANUFACTURE BITUMINOUS MIXTURES WITH A VERY LOW BINDER CONTENT, PROVIDED THESE MIXTURES ARE LAID TO SUFFICIENT THICKNESSES TO ENSURE GOOD COMPACTION. THIS TECHNIQUE UTILIZED CONVENTIONAL MATERIALS AND EQUIPMENT AND CAN BE USED ON ROADS OPEN TO TRAFFIC. GRAVEL-BITUMEN MIXTURE CAN BE USED AS A WEARING COURSE WITHOUT SURFACE DRESSING FOR SEVERAL MONTHS. /TRRL/

• Authors:
  • Faure, M
  • Renault, D
  • Saunier, J
• Publication Date: 1971-5

Language

• English

Media Info

• Features: Figures; Photos; Tables;
• Pagination: p. 77-88
• Serial:
  • Bull Liaison Labs Routiers /France/
  • Issue Number: 52
  • Publisher: Laboratoire Central des Ponts et Chausees (LCPC)

Subject/Index Terms

• TRT Terms: Binders; Bitumen; Bituminous mixtures; Compaction; Crushed aggregates; Deflection; Fatigue tests; Gravel; Hot coated materials; Mix design; Thickness; Wearing course (Pavements)
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00211282
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: TRIS
• Created Date: Dec 22 1973 12:00AM