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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

CONSTRUCTIONAL METHODS AND EQUIPMENT FOR MANUFACTURING ASPHALT ROADS WITH AN EVEN SURFACE /IN GERMAN/

AN IMPORTANT PREREQUISITE FOR THE EVENNESS OF THE SURFACING IS A HIGH PRELIMINARY COMPACTION BY THE FINISHER. TODAY THIS IS MORE THAN 90% AND SHOULD BE INCREASED TO 100% IF POSSIBLE. UNIFORM THICKNESS OF THE MIXTURE IS ALSO A PREREQUISITE FOR SMOOTH SURFACES; IRREGULAR THICKNESS OF THE LAYER MAY BE DUE TO THE DESIGN OF THE FINISHER, VARYING RATE OF PLACEMENT OR STOPPING OF THE FINISHER AND NON-UNIFORM TEMPERATURE OF THE MIXTURE. IRREGULARITIES IN THE LOWER LAYER MAY ALSO BE TRANSMITTED TO THE SURFACE. THESE ARE AVOIDED BY THE USE OF FINISHERS WHICH EXERT A HIGH PRELIMINARY COMPACTION; MIXTURES WITH A FLOATING PLANT AND, IN THE CASE OF GREAT IRREGULARITIES, ELECTRONICALLY-CONTROLLED LEVELLING EQUIPMENT, ARE ADVANTAGEOUS. IRREGULARITIES ALSO OCCUR DURING COMPACTION OF THE SURFACING AND THESE ARE CAUSED BY THE VERTICAL AND HORIZONTAL FORCES ACTING DURING THE ROLLING PROCESS. MEASURES FOR SUITABLE ROLLING OPERATIONS ARE DESCRIBED. SINCE MOST UNDULATIONS, AND THE LARGER UNDULATIONS, ARE FORMED DURING THE LAYING AND COMPACTION OF TRANSVERSE, LONGITUDINAL AND WORKING SEAMS, SPECIAL MEASURES ARE AGAIN NECESSARY IN THESE CASES. IN THE CASE OF INSUFFICIENT COMPACTION BY ROLLING, IRREGULARITIES OCCUR DURING COMPACTION BY TRAFFIC, PARTICULARLY IN THE TRAFFIC LANE IN THE FORM OF GROOVED TRACKS. IF THE STRUCTURE IS INSUFFICIENTLY POROUS, SUBSEQUENT COMPACTION MAY REDUCE THE RIGIDITY. /FG/RRL/

  • Supplemental Notes:
    • Vol 29, No 4, PP 103-110, 15 PHOT, 8 REF
  • Authors:
    • Volkl, L
  • Publication Date: 1967

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Filing Info

  • Accession Number: 00214929
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Aug 26 1970 12:00AM