ORGANIC CATIONIC CHEMICALS AS STABILIZING AGENTS FOR IOWA LOESS

THIS PAPER PRESENTS THE RESULTS OF PRELIMINARY EVALUATION STUDIES OF A NUMBER OF ORGANIC CATIONIC CHEMICALS AS STABILIZING AGENTS FOR IOWA LOESS. THE LOESS RANGES TEXTURALLY FROM SILTY LOAM TO SILTY CLAY. AN UNCONFINED COMPRESSION TEST IS USED FOR RATING THE CHEMICALS. IN THIS TEST, THE PRINCIPAL CRITERIA OF STABILITY ARE COMPRESSIVE STRENGTH, MOISTURE ABSORPTION, AND SWELLING AFTER 24 HOURS IMMERSION IN WATER. THE EFFECTS OF THE CHEMICALS ON AIR-DRY STRENGTH AND SHRINKAGE DURING AIR DRYING ARE ALSO CONSIDERED IN EVALUATING THE BENEFITS TO STABILITY. THOUGH OF A PRELIMINARY NATURE, THE INVESTIGATION DEMONSTRATES THE SUPERIORITY OF SEVERAL OF THE NINETEEN CATIONIC CHEMICALS USED. CHEMICALS DESIGNATED BY THE TRADE NAMES ARQUAD 2HT, ARQUAD 2S, ARMEEN RESIDUE, ARMAC T, CRUDE AMINE, AND ARMEEN RESIDUE ARQUAD, ARE CONSIDERED PARTICULARLY WORTHY OF FURTHER STUDY. THESE CHEMICALS IN AMOUNTS RANGING FROM 0.08 TO LESS THAN 1.0 PERCENT BY DRY WEIGHT OF THE SOIL SUBSTANTIALLY IMPROVE THE STABILITY OF LOESS. USED IN SUCH AMOUNTS, THE COST OF THE CHEMICALS PER SQUARE YARD OF BASE COURSE SIX INCHES THICK RANGES FROM ABOUT $0.14 TO $1.13, WHICH IS ECONOMICALLY FEASIBLE FOR HIGHWAY CONSTRUCTION. IT IS BELIEVED THAT CONVENTIONAL HIGHWAY CONSTRUCTION EQUIPMENT AND PROCEDURES COULD BE USED FOR THE PROCESSING OF SOIL WITH ORGANIC CATIONIC CHEMICALS. THE MOST PRACTICAL METHOD OF APPLYING THE CHEMICALS TO THE SOIL IS AS SOLUTIONS OR DISPERSIONS IN WATER, AND A SOLUTION OR DISPERSION WOULD BE ADDED TO THE SOIL IN THE AMOUNT NECESSARY FOR COMPACTION TO NEAR STANDARD PROCTOR DENSITY. IN THE CONCENTRATIONS USED, THE VISCOSITY OF THE SOLUTION OR DISPERSION IS LOW ENOUGH TO PERMIT SPRAYING. FIELD EXPERIMENTATION WILL BE NECESSARY TO EVALUATE MORE FULLY THE EFFECTIVENESS OF THE CHEMICALS. /AUTHOR/

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  • Accession Number: 00237721
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 26 1994 12:00AM