PERFORMANCE CHARACTERISTICS OF CEMENT-MODIFIED ASPAHLT EMULSION MIXES

This study which explores the use of lime and cement in emulsion-treated mixes (ETM), includes an investigation of the effect of water, asphalt hardness, and aggregate type on the resilient modulus (M sub R) and on fatigue behavior. A field test (described) confirmed laboratory findings. The procedure is described and results are detailed of experimentation in which ETM and cement-emulsion treated mixes (C-ETM) were made from Cache Creek aggregate, gradation I, containing 5 percent residual aspahlt from SS-type emulsions. The study showed that asphalt ETM develop resilient modulus on curing that varies directly as the hardness of the asphalt used to make the emulsion. Ambient temperature air-cured ETM attain M sub R higher than that of hot mixes made with the same asphalt. However, ETM water resistance is lower-than ATM until the ETM has fully cured. On re-drying, the M sub R of water soaked ETM is fully recovered. Cement (1.3 percent) modified ETM (C-ETM), rapidly develop high M sub R which also varies with the hardness of the asphalt; these C-ETM are resistant to water damage. Higher levels of cement cause greater changes in M sub R. The beneficial effect of cement on ETM occurs with a widely used gravel as well as with a pure limestone and a pure quartz aggregate. Cores taken from a field test demonstrating practicality of C-ETM, confirm the rapid field development of M sub R. Because of the exceptionally high M sub R developed by the C-ETM, the pavement thickness required for equal fatigue life (according to the elastic design method) shows that hot mixes (ATM) and C-ETM (1.3 percent cement) are about equally effective.

  • Supplemental Notes:
    • Proceedings of the meeting held in Houston, Texas, February 1973.
  • Corporate Authors:

    University of Minnesota, Minneapolis

    155 Experimental Engineering Building
    Minneapolis, MN  USA  55455
  • Authors:
    • Schmidt, R J
    • Santucci, L E
    • Coyne, L D
  • Conference:
  • Publication Date: 1973

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 300-319
  • Serial:
    • Volume: 42

Subject/Index Terms

Filing Info

  • Accession Number: 00127333
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 16 1975 12:00AM