Performance Evaluation of Cement Treated/Stabilized Very Weak Subgrade Soils

This research study was performed to evaluate the performance of cement treated/stabilized very weak subgrade soil specimens molded at high water content condition. Three soil types of different plasticity indices were considered in this research study. Three different wet of optimum moisture contents producing raw soil strength of 172 kPa (25 psi) or less were chosen for treatment/stabilization. The percentages of cement content were determined to achieve target seven-day strength values of 345 kPa (50 psi), treatment for working table application, and 1,034 kPa (150 psi) stabilization for subbase application. The repeated load triaxial (RLT) tests were performed on the laboratory molded treated/stabilized specimens to evaluate their resilient modulus and to study their deformation behavior under cyclic loading. The test results indicated that the proper selection of cement content for very weak and wet subgrade soil can substantially improve their performance in terms of resilient modulus and permanent deformation for working table and subbase applications. A good correlation was observed between the water/cement ratio and the resilient modulus/permanent deformation, with the soil specimens compacted at low water/cement ratios showing better performance than those compacted at high water/cement ratios. For heavily stabilized subgrade soils for subbase application, the permanent deformation of the stabilized layer can be neglected in the pavement design.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 1387-1395
  • Monograph Title: Geo-Congress 2014 Technical Papers: Geo-Characterization and Modeling for Sustainability

Subject/Index Terms

Filing Info

  • Accession Number: 01522578
  • Record Type: Publication
  • ISBN: 9780784413272
  • Files: TRIS, ASCE
  • Created Date: Mar 25 2014 3:05PM