Lime stabilization has been adopted for the construction of the majority of the foundation capping layer in three out of the four sections of the M40 motorway between Redditch and Banbury. The 12 km Gaydon Section begins where it crosses the River Avon. Where the Keuper marl was found to have a Plasticity Index Value less than the specified minimum value of 10 for lime stabilization, the design includes for 600 mm of granular capping. For the majority of the section, however, weathered marl is at formation level and is stabilized in situ to a depth of 400 mm in two layers. During stabilization work, some problems are being encountered where the design required the road construction to extend fully to vertical drainage elements as this required the edge detail to be protected prior to stabilization to avoid damage from the wheels of the stabilization plant. The specification calls for the stabilized layer to achieve a minimum bearing ratio of 15% prior to construction of the succeeding layer. In practice this is achieved within two days of stabilization, the normal result being around 30% at this age. Unconfined compressive strength testing has shown results in the range 0.4-1.2 N/sq mm.

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  • Corporate Authors:

    D.R. Publications Limited

    Faversham House, 111 St James Road
    Croydon, Surrey CR9 2TH,   England 
  • Publication Date: 1989-10

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Filing Info

  • Accession Number: 00489776
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Nov 30 1989 12:00AM