DESIGN OF EMULSIFIED ASPHALT-AGGREGATE BASES FOR LOW VOLUME ROADS

This paper briefly summarizes procedures that have been developed for both mixture and structural design of emulsified asphalt-aggregate bases for low volume roads. The procedures are based on laboratory, analytical, and field studies. The Marshall equipment, resilient modulus, and a capillary moisture soak test are used for determining structural and durability properties. The mix design procedure determines the following: (1) suitability of aggregate and emulsified asphalt, (2) compatibility of emulsified asphalt and aggregate (including acceptable range of premix aggregate water content), (3) optimum moisture content at compaction, (4) optimum residual asphalt content, and (5) adequacy of mixture structural and durability properties. These procedures are developed specifically for dense graded cold mix base courses of low traffic volume roadways. The use of local aggregates has been particularly emphasized in this study. A method to relate the cold mixture structural properties, as determined from laboratory test, to the "structural coefficient" of the base course was developed. Data obtained from specially cured specimens during the mixture design are used to determine the material's structural coefficient. The structural coefficient of the base is then used to select the required structural thickness using the AASHTO Interim Guide or similar design procedure. The procedures were evaluated over a range of actual in-service pavements and materials, and found to give satisfactory results. /Authors/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 164-172
  • Monograph Title: Low volume roads: second international conference; proceedings, August 20-23, 1979
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00301114
  • Record Type: Publication
  • ISBN: 309028434
  • Files: TRIS, TRB
  • Created Date: Oct 17 1979 12:00AM