The design and performance of cement stabilised bases constructed using the slurry mix process

Cement has long been used in road foundation and/or sub-grade stabilization or recycling of existing pavement. Cement stabilization provides a significant increase in bearing capacity with reduced susceptibility to moisture, allowing important savings in the overall pavement structure, for rehabilitation or new construction. Modern engineering standards in reclaiming equipment, involving mobile slurry-mixers with precise metering, allow now reducing the once recurring variability of in-place cement stabilization. Field-produced mixtures can match the job-mix formulae, based on laboratory-mixed specimens. Such equipment cumulates the advantages of mobile trains (optimal use of site material, reduced hauling costs), along with the consistency of a central mixing plant. Field evaluation of the in-place stabilized layer was performed using the Falling-Weight-Deflectometer (FWD). The Resilient Modulus of the layers was then obtained by back-calculation. The relationship between the "In-Place Resilient modulus" of the reclaimed road-layer and the "Mix-Design Unconfined Compression Strength" was determined and found to be consistent with previous experimentation on similar material. The use of this effective in-place modulus in mechanistic pavement design models has permitted to move towards performance-based specifications that enable engineers to take efficient advantage of the construction method and substantially reduce the construction costs.

Language

  • English

Media Info

  • Pagination: 20p
  • Monograph Title: First International Symposium on Subgrade Stabilisation and In Situ Pavement Recycling Using Cement, Salamanca, Spain, 1-4 October 2001

Subject/Index Terms

Filing Info

  • Accession Number: 01392475
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 8489875278
  • Files: ATRI
  • Created Date: Aug 23 2012 7:09AM