Recent research at the University of Dundee has shown that a mix including up to 83 per cent by mass of reclaimed material is as good as a conventional mix produced from new bitumen and aggregate. Although the practicality of recycling either in a central plant or in situ, has been demonstrated there is a shortage of information on its performance. Investigations showed that hot planing reduced the penetration of the bitumen by an average of 17 per cent. However because many samples showed less hardening, careful attention to the planing operation could result in less than 17 per cent hardening. Penetration and softening point of the recovered bitumen was also found to conform with BS 3690 and so conventional softening agents can be used as modifiers. Comparisons of the structural properties such as dynamic stiffness and creep with conventional 30 per cent stone content hot rolled asphalt showed that both recycled and conventional mixes performed identically. It is estimated that the cost of reclaimed hot rolled asphalt can be as little as 27 per cent of that of new bitumen. (TRRL)

  • Availability:
  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Stock, T
  • Publication Date: 1984-6

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Filing Info

  • Accession Number: 00392699
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Apr 29 1985 12:00AM