MIX DESIGN CRITERIA FOR CEMENT MODIFIED EMULSION TREATED MATERIAL

This paper is the second part of a comprehensive investigation of the stabilization of sands and sand-clay aggregates with asphalt emulsion. The objective here is to develop mix design criteria for emulsion treated soil aggregates. Previous investigations by author and others suggest that cement in trace quantities is indispensible in order to enhance the durability of sand-emulsion mixtures; accordingly Cement-modified Emulsion Treated Material (CETM) only is studied herein. With due consideration to the prevailing distress mechanisms in cold mix bases, several tests are proposed to evaluate CETM. Marshall stability and shear strength tend to exhibit an optimum, respectively, with emulsion content and fines content. It appears feasible to predict the Marshall stability of CETM from a simple soil property such as particle size distribution. Using the test results on five naturally occurring soils and one synthetic aggregate mix design criteria for sands and sandy soils is proposed. Minimum Marshall stability of 4.23 kN (950 lbs) insures that CETM will not undergo shear failure under heavy truck tire pressure. Another criterion to detect and avoid moisture susceptible mixtures is that Marshall cylinders during vacuum soaking should not absorb more than 8.5% moisture. A third criterion to safeguard against stiff mixtures is that the seven day "dry bearing strength" shall not exceed 2760 kPa (400 psi). The recommended design values and test method are presented and discussed in the paper. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 182-190
  • Monograph Title: Low volume roads: second international conference; proceedings, August 20-23, 1979
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00301116
  • Record Type: Publication
  • ISBN: 309028434
  • Files: TRIS, TRB
  • Created Date: Oct 17 1979 12:00AM