DESIGN AND CONSTRUCTION OF AGGREGATE BASE COURSES WITH CALCIUM CHLORIDE

AGGREGATE BASE COURSES ARE DEFINED AS THE USE OF WELL GRADED, SOUND AND DURABLE CRUSHED STONE, GRAVEL OR OTHER SUITABLE AGGREGATES AS FOUNDATION COURSES FOR BITUMINOUS PAVEMENTS. FINAL PERFORMANCE DEPENDS UPON DESIGN, MATERIALS AND CONSTRUCTION. THE DESIGN TREND NOW IS TOWARD THE USE OF EQUATIONS OR FORMULAS BASED ON RELATIONSHIPS BETWEEN TRAFFIC AND VARIOUS PAVEMENT DESIGNS. BETTER CONSTRUCTION CONTROL AND PRACTICES ARE ADVOCATED TO HELP ATTAIN MAXIMUM PERFORMANCE FROM THE NATURAL SUBGRADE, SUBBASE AND BASE COURSE MATERIALS AND THUS IMPROVE PAVEMENT PERFORMANCE. SEVEN EXAMPLES ARE OUTLINED OF POOR CONSTRUCTION PRACTICES OFTEN ASSOCIATED WITH AGGREGATE BASE COURSE CONSTRUCTION. IT IS POINTED OUT THAT THE USE OF CALCIUM CHLORIDE IN BASE CONSTRUCTION, WITH THE RESULTING UNIFORM MOISTURE CONTROL, PROVIDES THE FOLLOWING BENEFITS: (1) IT AIDS COMPACTION AND INCREASES DENSITY, (2) IT REDUCES OR ELIMINATES THE NEED FOR SURFACE APPLICATIONS OF WATER (3) IT PERMITS CARRYING OF TRAFFIC WITHOUT RAVELLING OR DUST, (4) IT PROVIDES A MORE STABLE PLATFORM FOR PLACING EQUIPMENT, (5) IT PERMITS USE OF MINIMUM FINES OR BINDER, AND (6) IT ACTS AS A QUALITY CONTROL INGREDIENT TO HELP INSURE DESIRED RESULTS. IT IS CONCLUDED THAT HIGH QUALITY GRADED AGGREGATE BASE COURSES HAVE A DEFINITE PLACE IN BALANCED DESIGN OF MODERN FLEXIBLE PAVEMENTS BASED ON YEARS OF ACCUMULATED PERFORMANCE, THE AASHO ROAD TEST AND LATEST RESEARCH. THE PROPER USE OF CALCIUM CHLORIDE IN AGGREGATE BASE COURSES INSURES AN EFFECTIVE METHOD OF ACHIEVING MAXIMUM PERFORMANCE FROM QUALITY MATERIALS.

  • Corporate Authors:

    American Association of State Highway Officials

    Design Committee Meeting, New York
    ,   USA 
  • Authors:
    • SMITH, H A
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00231453
  • Record Type: Publication
  • Source Agency: Calcium Chloride Institute
  • Files: TRIS
  • Created Date: Aug 15 2004 2:24AM