1. Home
  2. TRID
  3. View Record
https://www.nationalacademies.org/trb/events

RECYCLING ROAD PAVEMENTS - TECHNIQUES AND OPPORTUNITIES --HIGHWAY CONSTRUCTION & MAINTENANCE. PROCEEDINGS OF SEMINAR F HELD AT THE PTRC TRANSPORT & PLANNING SUMMER ANNUAL MEETING, BATH UNIV. ENGLAND 7-11 SEPTEMBER 1987, VOLUME P293

The paper describes the recycling techniques currently available for bituminous materials and explores possible reasons for their non-implementation. Recycling techniques fall into two broad categories according to the location in which material is processed. The first group of techniques can be labeled as in-situ processes in which all processing takes place without transporting the reclaimed material from the location on the highway from which it is being lifted. The second group of techniques can be labeled as in-plant processes in which all processing takes place at a conveniently located plant to which the reclaimed material and any other material to be included in the final mix is transported. Both groups of techniques can be sub-divided into hot processes and cold processes depending simply upon the need to apply heat to soften the binder sufficiently to facilitate mixing. It should be noted that heating is not essential for effective mixing and coating of the stone. Development of recycling techniques in Great Britain started in the late 1930's, though the war delayed implementation of the process until 1950. The process, named "retread" is a cold in-situ process and is still in use in Britain. About one million square meters of pavement is treated with this process annual in Britain. Unfortunately having established an early lead in the application of recycling techniques to highways, engineers in Great Britain did not continue to develop and extend the processes. Hence it was not until the late 1970's, and following the lead given by the North americans that new processes were tried in Great Britain. Hot in-situ recycling processes were imported, initially from North America -the cutler and jim jackson machines (the latter becoming known as the jobling purser machine) and latterly from Germany -the wirtgen machine. Also in the late 1970's and early 1980's a British manufacturer of asphalt mixing plant and a major contractor collaborated in the development of a British made drum mix plant capable of including reclaimed material in an asphalt mix. Plant with this capability was commonplace in North America by this time and today any drum mixer purchased will be fitted with most, if not all, the attachments necessary for the production of recycled mixes as standard equipment. They are not optional extras. This paper will discuss some of the techniques currently available for recycling and also suggest some likely developments. The opportunities for recycling in the United Kingdom will be discussed and some suggestions made concerning extension of recycling across more of the highway network. The environment in which recycling processes can be encouraged will also be discussed.(a) for the covering abstract of the seminar see IRRD 816254.

  • Availability:
  • Corporate Authors:

    PTRC Education and Research Services Limited

    110 Strand
    London WC2,   England 
  • Authors:
    • Stock, A F
  • Publication Date: 1987

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00483081
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0-86050-175-2
  • Files: ITRD, TRIS
  • Created Date: May 31 1989 12:00AM