TRIALS OF THE MANUFACTURE AND MACHINE LAYING OF MASTIC ASPHALT

A SERIES OF TRIALS HAS BEEN UNDERTAKEN TO INVESTIGATE (1) THE MANUFACTURE OF MASTIC ASPHALT ON A CONVENTIONAL ROLLED- ASPHALT MIXING PLANT WITH AN ADDITIONAL DRYER, AND (2) THE MACHINE-LAYING OF MASTIC ASPHALT. BOTH WATERPROOFING-GRADE MASTIC ASPHALT (BASED ON B.S. 988:1966) AND PAVING-GRADE MASTIC ASPHALT WITH 42.5 PER CENT OF COARSE AGGREGATE (BASED ON B.S. 1447:1962) HAVE BEEN USED IN THESE TRIALS. IT HAS BEEN DEMONSTRATED THAT IT IS FEASIBLE AND PRACTICAL TO MANUFACTURE MASTIC ASPHALT ON AN ASPHALT MIXING PLANT WITH A NORMAL MIXING CYCLE. IT IS ALSO POSSIBLE TO LAY MASTIC ASPHALT MECHANICALLY, ALTHOUGH THERE ARE PROBLEMS IN COMBATING TRANSVERSE FLOW OF THE HOT MATERIAL WHEN LAYING ON A CROSS-FALL AND THE LONGITUDINAL JOINT TRENDS NOT TO BE COMPLETELY SATISFACTORY; THIS IS A QUESTION OF LEVEL AND APPERANCE, THERE BEING NO PROBLEM OF OBTAINING A WATER-TIGHT JOINT. THE EFFECT OF 'BLOWING' IN RELATION TO THE NATURE OF THE SUBSTANCE HAS BEEN BRIEFLY STUDIED. A REVIEW IS MADE OF THE REMAINING STEPS IN THE RESEARCH WHICH ARE CONSIDERED NECESSARY TO PRODUCE VIABLE PROCESSES FOR THE MANUFACTURE AND LAYING OF MASTIC ASPHALT AT A RELATIVELY HIGH RATE OF OUTPUT. /A/RRL/

• Supplemental Notes:
  • Lr 298, 41 PP, 6 FIG, 11 TAB, 7 REF
• Authors:
  • Matthew, D H
  • FERNE, B W
• Publication Date: 1969

Media Info

• Serial:
  • Rrl Reports, Road Research Lab /UK/

Subject/Index Terms

• TRT Terms: Asphalt; Asphalt pavements; Longitudinal joints; Machines; Manufacturing; Mastic asphalt; Mixing plants; Slopes; Waterproofing materials
• Uncontrolled Terms: Grades; Laying; Transverse movement
• Old TRIS Terms: Bituminous mixing plants; Blown asphalt; Dryers /equipment/; Mastics
• Subject Areas: Construction; Highways; Materials;

Filing Info

• Accession Number: 00215047
• Record Type: Publication
• Source Agency: Road Research Laboratory /UK
• Files: TRIS
• Created Date: Apr 25 1971 12:00AM