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Accelerated loading evaluation of subbase layers in pavement performance.
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Filetype[PDF-1.75 MB]

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  • Edition:
    Final report; Apr. 1, 2003-June 30, 2008.
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology ; NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ;
  • Abstract:
    This report documents the research efforts conducted at the Louisiana Transportation Research Center (LTRC) regarding chemical stabilization of the naturally wet and problematic clayey soils typically found as subgrade in south Louisiana and provides detailed information on experiment design, instrumentation, and field and laboratory tests. The objectives of the study included the exploration and development of a methodology to build reliable and conservatively achievable subgrade layers, stabilized with cementitious agents at various field moisture contents so that a treated subgrade layer would not only provide a working table for pavement construction, but could also function as a pavement subbase layer that contributes to the overall pavement structural capacity. Three additives were studied throughout this research: cement, lime, and lime-fly ash. Testing included moisture density evaluations, various additive percentages, various molding moistures and curing times, tube suction testing, resilient modulus and permanent deformation, Eades and Grim tests, and Accelerated Loading Facility (ALF) tests on similar full-scale pavement sections with cement-stabilized and lime-treated subgrades with the magnitude of the ALF loads kept at 9,750 lb. for the first 200,000 repetitions then increased in incremental intervals of 2,300 lb.

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