SOIL STABILIZATION FIELD TRIALS, PRIMARY HIGHWAY 117, JASPER COUNTY, IOWA

THE METHODS OF CONSTRUCTION AND THE EVALUATION ARE PRESENTED OF THREE YEARS OF FIELD AND LABORATORY OBSERVATIONS OF 6000 FEET OF STABILIZED SOIL BASE AND SUBBASE COURSES OF PRIMARY HIGHWAY 117, JASPER COUNTY, IOWA. THE 6-INCH SUBBASE TEST SECTIONS WERE CONSTRUCTED BY USING THE IN-PLACE SUBGRADE LOESSIAL SOIL MATERIALS STABILIZED WITH LIME, LIME-FLY ASH, AND COMMERCIAL ORGANIC CATIONIC CHEMICAL. THE 7 IN. BASE COURSE TEST SECTIONS WERE CONSTRUCTED USING A SAND-LOESS SOIL MIXTURE STABILIZED WITH LIME-FLY ASH, LIME-FLY ASH-ACCELERATING AGENT, AND TYPE I PORTLAND CEMENT. THE FLY ASH WAS OBTAINED FROM TWO SOURCES. SODIUM CARBONATE AND SODIUM CHLORIDE WERE USED AS ACCELERATING AGENTS IN TWO SECTIONS OF LIME-FLY ASH BASE COURSE. THE SURFACE COURSE WAS 3 IN. OF AN ASPHALTIC CONCRETE MIX. THE EVALUATION PROGRAM OF THE TEST SECTIONS WAS DIVIDED INTO THREE PHASES: (1) LABORATORY ANALYSIS AND DEVELOPMENT OF PROJECT SPECIFICATIONS BEFORE CONSTRUCTION, (2) CONSTRUCTION OF BASE AND SUBBASE COURSES, AND (3) FIELD AND LABORATORY TESTING, AND EVALUATION UNDER EXISTING TRAFFIC AND WEATHER CONDITIONS. CONVENTIONAL CONSTRUCTION PRACTICES WERE USED: SCARIFICATION, BLADING, SPREADING OF STABILIZING AGENT, SINGLE AND MULTI-PASS MIXING, SHEEPSFOOT AND RUBBER-TIRED COMPACTION. WATER FOR STANDARD PROCTOR OPTIMUM MOISTURE CONTENT WAS APPLIED THROUGH THE SPRAY BAR OF THE SINGLE-PASS MIXER. THE CHEMICAL WAS APPLIED IN A WATER SOLUTION THROUGH THE SPRAY BAR AT A RATE AND WATER CONCENTRATION NECESSARY FOR DESIRED OPTIMUM MOISTURE CONTENT AND CHEMICAL CONCENTRATION IN THE SOIL. PERFORMANCE EVALUATION WAS ACCOMPLISHED THROUGH TESTING OF LABORATORY SPECIMENS, CORE SAMPLES, BENKELMAN BEAM TESTS, CRACK STUDIES, WEATHER INFORMATION, TRAFFIC VOLUMES AND ROAD ROUGHNESS MEASUREMENTS. THE ROAD HAS SUSTAINED SEVERE FREEZING AND MOISTURE CONDITIONS AND IS IN AN EQUALLY EXCELLENT CONDITION TO THE NON-EXPERIMENTAL SECTIONS. RESULTS OF SOIL-BACTERIAL COUNTS INDICATE THAT THE PRESENCE OF THE CHEMICAL IN THE TREATED SOIL MATERIAL HAS RESULTED IN NO NET INCREASE OR DECREASE IN THE QUANTITY OF MICROORGANISMS PRESENT AT THE TIME OF THE STUDY. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; References; Tables;
  • Pagination: pp 41-68
  • Monograph Title: Chemical soil stabilization and soil aggregate stabilization
  • Serial:

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Filing Info

  • Accession Number: 00231296
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:41AM