STABILISATION - THE PROCESS. LIME STABILISATION '90. PAPERS PRESENTED AT THE SECOND BACMI TECHNICAL SYMPOSIUM ON LIME STABILISATION, MARCH 1, 1990, PENNS HALL HOTEL, SUTTON COLDFIELD

This article describes the process of lime stabilization as used by Powerbetter Ltd. The soil is first analysed to determine its basic physical properties and to check for harmful impurities. Laboratory trials are then conducted to determine the amount of additive needed to achieve the design strength, and to establish optimum moisture content. Lime is spread on the ground in parallel strips of 2-3 metres wide. Discharge is geared to the speed of travel and spread rate is determined by a gate control with variable adjustment. A Bomag MPH 100 is used to mix the lime with the soil. Parallel strips of 2.1 metres wide are mixed with approximately 0.150 mm overlap between adjacent pastes. Required pulverization is usually achieved after the first 2 passes, but with highly plastic soils it may not be achievable until after the lime has had time to react with the clay. Correct moisture content is maintained by spraying sufficient water onto the soil. The best long term results are obtained by adding sufficient water to raise the moisture content of the clay to approximately 1.2 tons the natural plastic limit when the lime is added to the soil. Compaction equipment is chosen which is appropriate to the soil type and depth of stabilization. The ground is fully compacted and trimmed to level between each mix and before the mixture is left for its maturing period. On compaction of the maturing period, the third and final mix taken place. A motor grader is used to trim the surface after final compaction and finished levels are checked against setting out pins or profile boards, or by using laser level control. After grading the surface is again rolled to produce a close sealed finish. Brief details of lime applications and of bulk fill treatment are also provided. For the covering abstract of the conference see IRRD 829661.

  • Corporate Authors:

    British Aggregate Construction Materials Industrie

    156 Buckingham Palace Road
    London,   England 
  • Authors:
    • FERGUSON, D
  • Publication Date: 1990

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00606051
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM